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GREG@SN95
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EEC-IV Diagnostic Codes
One thing I noticed we are missing in this topic is a post with the codes and what they are for each test ran. SO HERE WE GO.
First are the two digit codes:
O= KOEO
R= KOER
M= memory, continuous
11 - System Pass (O,M,R)
12 - RPM Not Within Self Test Upper Limit (R), Idle Speed Control motor or Air Bypass not controlling idle properly -generally idle too low
13 - RPM Not Within Self Test Lower Limit (R), DC Motor Did Not Move (O,M,R), Idle Speed Control motor or Air Bypass not controlling idle properly -generally idle too high
14 - Profile Ignition Pickup Circuit Failure (M)
15 - Readout Memory Test Failed (O), Keep Alive Memory Test Failed (M)
16 - RPM Too Low To Perform o2 Sensor Test (R)
17 - RPM below Self-Test limit with Idle Air Control off (R)
18 - Spark Out (SPOUT) Circuit Open (R), Loss Of Ignition Diagnostic Module Input To PCM/SPOUT Circuit Grounded (M)
19 - Failure In PCM Internal Voltage (R), Erratic RPM During Hard Idle Self Test (R), Failure in EEC reference voltage (O)
21 - Engine Coolant Temperature, ECT Sensor Out Of Self Test Range. 0.3 volts (250?F) to 3.7 volts (50?F)(O,R)
22 - Manifold Absolute Pressure/Barometric Pressure Sensor Out Of Self Test Range (O,M,R)
23 - Throttle Position Sensor Out Of Self Test Range (O,M,R)
24 - Intake Air Temperature/Air Charge Temperature Sensor Out Of Self Test Range. 0.3 volts (250?F) to 3.7 volts (50?F)(O,R)
25 - Knock Not Sensed During Dynamic Response Test (R)
26 - Mass Air Flow Sensor was greater than 0.7 volts with engine off (O), MAF sensor was not between 0.2 and 1.5 volts with engine running (R).
28 - Loss Of Ignition Diagnostic Module RH Side (M)
29 - Insufficient Input From Vehicle Speed Sensor -To 1992 (M), Insufficient Input From Programmable Speedometer/Odometer Module -From 1993 (M)
31 - EGR Valve Position/Pressure Feedback EGR Circuit Below Minimum Voltage. 0.24 volts (O,M,R)
32 - EGR Valve Position/Pressure Feedback EGR Voltage Below Closed Voltage. 0.24 volts (O,M,R)
33 - EGR Valve Opening Not Detected (M,R)
34 - EGR Valve Position/Pressure Feedback EGR Voltage Above Closed Limit (O,R), PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts (M)
35 - EGR Valve Position/EGR Pressure Feedback EGR Circuit Above Maximum Voltage of 4.81 volts (O,R), PFE or EVP circuit has intermittently failed above the maximum limit of 4.81 volts (M)
36 - System Indicates Lean At Idle (R)
37 - System Indicates Rich At Idle (R)
39 - AXOD converter bypass clutch not applying properly (M)
41 - System Indicates Lean -passenger side(R), No o2 Sensor Switching Detected. always lean -passenger side(M)
42 - System Indicates Rich -passenger side(R), No o2 Sensor Switching Detected. always rich -passenger side(M)
43 - o2 Sensors indicate lean at Full Throttle (M)
44 - Secondary Air System Inoperative. bank one, passenger side (R)
45 - Secondary Air Upstream During Self Test (R)
46 - Secondary Air Not Bypassed During Self Test (R)
47 - Measured Air Flow Low At Base Idle (R)
48 - Measured air flow too high at base idle (R)
49 - 1?2 Shift Error (M)
51 - Engine Coolant Temperature Circuit Open (M,O)
52 - Power Steering Pressure Switch Circuit Open (O), Power Steering Pressure Switch Circuit Did Not Change States (R)
53 - Throttle Position Sensor Circuit Above Maximum Voltage (M,O)
54 - Intake Air Temperature/Air Charge Temperature Circuit Open (M,O,R)
55 - Key Power Check (R)
56 - Mass Air Flow/Vane Air Flow Sensor Circuit Above Maximum Voltage (O,M,R), MAF Sensor short to power (M,R), Transmission Fluid Temperature Circuit Open (M,O)
57 - AXOD Neutral pressure switch circuit failed open (M)
58 - Idle Tracking Switch Circuit Open Or Grounded -CFI (O,R), Vane Air Temperature Sensor Input Greater Than Self Test Maximum -EFI (M,O)
59 - 2?3 Shift Error (M), AXOD 4/3 Pressure Switch Circuit Failed Closed (O), AXOD 4/3 Pressure Switch Circuit Failed Open (M)
61 - ECT Sensor Circuit Grounded (O,M,R)
62 - Torque Converter Clutch Error (M), AXOD 4/3 Or 3/2 Pressure Switch Circuit Grounded (O)
63 - Throttle Position Sensor Circuit Below Minimum Voltage (O,M,R)
64 - Intake Air Temperature/Air Charge Temperature Circuit Grounded (O,M,R)
65 - Transmission Control Switch/Overdrive Cancel Switch Circuit Did Not Change States (R)
66 - , MAF signal below minimum test voltage of .4vdc (O,M,R), Transmission Fluid Temperature Circuit Grounded (M,O)
67 - Park Neutral Position Switch Circuit Open; A/C On -Manual (O), Manual Lever Position Sensor Out Of Range/A/C On (M,O), Clutch Switch Circuit Failure (M)
68 - Transmission recently overheated, or TOT sensor intermittently failed below 0.2 volts (M)
69 - 3?4 Shift Error (M)
71 - Software re-initialization detected or Cluster Control Assembly circuit failed (M)
72 - Insufficient Manifold Absolute Pressure/Mass Air Flow Change During Dynamic Response Test (R)
73 - Insufficient Throttle Position Change During Dynamic Response Test (O,R)
74 - Brake On/Off Circuit Open?Not During Self Test (M,R)
75 - Brake On/Off Circuit Closed/ECA Input Open (R)
76 - Insufficient Vane Air Flow Sensor Output Change During Dynamic Response Test (R)
77 - Operator Error Dynamic Response Test (R)
78 - Re-Initalization Check (R)
79 - A/C On/Defrost On During Self Test (O)
81 - Secondary Air Diverter Circuit Failure (O)
82 - Secondary Air Bypass Circuit Failure (O)
83 - EGR Control solenoid circuit failure (O)
84 - EGR Vacuum Regulator (EVR) Control Circuit Failure (O)
85 - CANP Circuit Failure (O)
86 - Adaptive fuel limit reached (M), 3 ? 4 Shift solenoid circuit failure (O)
87 - Primary Fuel Pump Circuit Failure (M,O)
88 - Loss Of Dual Plug Input Control (M), Throttle Kicker Fault
89 - Converter clutch solenoid circuit failure (M)
91 - o2 Sensor Circuit Indicates Lean -driver side(R), No o2 Sensor Switching Detected. always lean -driver side(M), Shift Solenoid 1 Circuit Failure (O)
92 - o2 Sensor Circuit Indicates Rich -driver side(R), No o2 Sensor Switching Detected. always rich -driver side(M), Shift Solenoid 2 Circuit Failure (O)
93 - Converter Clutch Solenoid Circuit Failure (O)
94 - Secondary Air Injection Inoperative. bank two, driver side (R), Torque Converter Clutch Solenoid Circuit Failure (O)
95 - Fuel Pump Circuit Open-PCM To Motor Ground (M,O)
96 - Fuel Pump Circuit Open-Battery To PCM (M,O)
97 - Transmission Control Indicator Lamp Circuit Failure (O)
98 - Hard Fault Present (R)
99 - Electronic Pressure Control Circuit Failure (M,O)
Next, 3 Digit codes
O= KOEO
R= KOER
M= memory, continuous
111 - System Pass
112 - ACT Sensor Circuit Below Minimum Voltage of 0.2 volts (O), ACT circuit has intermittently failed below minimum 0.2 volts (M)
113 - ACT Sensor Circuit Above Maximum Voltage of 4.6 volts (O), ACT circuit has intermittently failed above the maximum of 4.6 volts (M)
114 - ACT out of self test range 0.3 to 3.7 volts
116 - ECT out of self test range 0.3 to 3.7 volts
117 - ECT Sensor Circuit Below Minimum Voltage of 0.2 volts(O), ECT circuit has intermittently failed below minimum 0.2 volts (M)
118 - ECT Sensor Circuit Above Maximum Voltage of 4.6 volts (O), ECT sensor circuit has intermittently failed above the maximum of 4.6 volts (M)
121 - Closed throttle TPS voltage higher or lower than expected (O,R), TP sensor was inconsistent with the MAF/MAP value in the last 80 drive cycles (M)
122 - TPS circuit below minimum 0.6 volts (O), TPS circuit has intermittently failed below minimum 0.6 volts (M)
123 - TP circuit above maximum 4.5 volts (O), TPS circuit has intermittently failed above maximum 4.5 volts (M)
124 - TP sensor was higher than expected with the MAF/MAP value in the last 80 drive cycles (M)
125 - TP sensor was lower than expected with the MAF/MAP value in the last 80 drive cycles (M)
126 - MAP/BP sensor out of self test range 1.4 to 1.6 volts
128 - MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation
129 - Insufficient MAF/MAP change during Dynamic Response Test
136 - o2 Sensor circuit indicates system lean (left side)
137 - o2 Sensor circuit indicates system rich (left side)
139 - No HEGO sensor switching detected or disconnected (left side)
141 - o2 Sensor circuit indicates system lean (both sides)
144 - No o2 Sensor switching detected or disconnected (right side)
157 - MAF sensor went below 0.4 volts during the last 80 warm-up cycles
158 - MAF sensor went above 4.5 volts during the last 80 warm-up cycles
159 - MAF signal was greater than 0.70 volt during KOEO (O), MAF signal was not between 0.20 and 1.50 volts during KOER (R)
167 - TPS did not exceed 25% rotation during the Dynamic Response Test
171 - Fuel system at adaptive limit, o2 Sensor unable to switch (right side)
172 - o2 Sensor sensor circuit indicates system lean (right side)
173 - o2 Sensor sensor circuit indicates system rich (right side)
174 - o2 Sensor switching time is slow
175 - Fuel system at adaptive limit, o2 Sensor unable to switch(left side, (Bank No. 2))
176 - o2 Sensor circuit indicates system lean (left side)
177 - o2 Sensor circuit indicates system rich (left side)
178 - o2 Sensor switching time is slow (Bank No. 1)
179 - Right side still rich, at leanest adaptive limit, during part throttle
181 - Right side still lean, at richest adaptive limit, during part throttle
182 - Right side still rich, at leanest adaptive limit, at idle
183 - Right side still lean, at richest adaptive limit, at idle
184 - MAF higher than expected
185 - MAF lower than expected
186 - Injector pulse width longer than expected
187 - Injector pulse width shorter than expected
188 - Left side still rich, at leanest adaptive limit, during part throttle
189 - Left side still lean, at richest adaptive limit, during part throttle
191 - Left side still rich, at leanest adaptive limit, at idle
192 - Left side still lean, at richest adaptive limit, at idle
193 - Flexible Fuel sensor circuit failure
194 - Run cylinder balance diagnostic test
195 - Run cylinder balance diagnostic test
211 - Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall
212 - Loss of IDM (Ignition Diagnostic Monitor) input to EEC or SPOUT circuit grounded
213 - SPOUT circuit open
214 - Cylinder Identification (CID) circuit failure
215 - EEC detected coil 1 primary circuit failure
216 - EEC detected coil 2 primary circuit failure
217 - EEC detected coil 3 primary circuit failure
218 - Loss of IDM (Ignition Diagnostic Monitor) signal (left side)
219 - SPOUT failure, spark timing has defaulted to 10 degrees BTDC
222 - Loss of IDM (Ignition Diagnostic Monitor)signal (right side)
223 - Loss of Dual Plug Inhibit control
224 - Erratic IDM (Ignition Diagnostic Monitor)input to processor
225 - Knock Sensor (KS) signal not sensed during dynamic response test
226 - IDM (Ignition Diagnostic Monitor)signal not received
244 - Camshaft Position (CMP) Sensor failure
311 - Thermactor air system inoperative (right side)
312 - Thermactor air misdirected upstream during self test
313 - Thermactor air not bypassed during self test
314 - Thermactor air system inoperative (left side)
326 - PFE or DPFE circuit voltage lower than expected with zero EVR duty cycle
327 - DPFE or EVP circuit below minimum voltage of 0.2 volts
328 - EVP circuit below minimum voltage of 0.24 volts
332 - EGR valve opening not detected
334 - DPFE or EVP circuit above the closed limit of 0.67 volts
335 - PFE or DPFE sensor voltage out of Self-Test range
336 - EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle
337 - DPFE or EVP circuit above the maximum limit of 4.81 volts
338 - ECT lower than expected
339 - ECT higher than expected
341 - Octane Adjust shorting bar is not in or the OCT ADJ circuit is open
381 - Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds
411 - Cannot control rpm during KOER low RPM check
412 - Cannot control rpm during KOER high RPM check
452 - Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles
461 - Engine over speed was detected
511 - EEC permanent Read Only Memory (ROM) test failed
512 - EEC battery powered Keep Alive Memory (KAM) test failed
513 - Failure in EEC processor internal voltage
519 - Power steering pressure switch circuit open
521 - Power steering pressure switch did not change state during KOER test
522 - Vehicle not in PARK or NEUTRAL during KOEO
524 - When the PCM commanded the fuel pump on, voltage was not detected on FPM
525 - Vehicle in gear or A/C on during Self-Test
526 - Neutral Pressure Switch closed or A/C on
527 - Neutral Drive Switch open or A/C on
528 - Clutch Switch Circuit failure
529 - Data Communications Link or Electronic Instrument Cluster circuit failure
532 - Data Communications Link or Electronic Instrument Cluster circuit failure
533 - Data Communications Link or Electronic Instrument Cluster circuit failure
536 - Brake On/Off circuit failure / switch not actuated during KOER test
538 - Insufficient RPM change during KOER dynamic response test/ Operator error
539 - A/C or Defroster ON during KOEO test
542 - Fuel pump circuit failure
543 - When the PCM commanded the fuel pump on, voltage was not detected on FPM
551 - Intake Manifold Runner Control (IMRC) circuit failure
552 - Air management 1 circuit failure (AM1/TAB)
553 - Air management 2 circuit failure (AM1/TAD)
554 - Fuel Pressure Regulator Control (FPRC) solenoid circuit failure
556 - Fuel Pump circuit failure
557 - Fuel pump relay coil resistance failure
558 - EGR Vacuum Regulator circuit failure
559 - Air Conditioning On relay circuit failure
563 - High Speed Electro-Drive Fan circuit failure
564 - Electro-Drive Fan circuit failure
565 - Canister purge circuit failure
566 - 3 ? 4 Shift Solenoid failure
569 - Canister purge 2 circuit failure
571 - EGR Atmospheric Regulator circuit failure
572 - EGR Vacuum Regulator circuit failure
578 - A/C Pressure (ACP) sensor VREF circuit is short to ground
579 - A/C Pressure (ACP) sensor circuit is above maximum voltage
581 - When the cooling fan was activated, the circuit exceeded current draw
582 - Open or short to power in the power-to-cooling fan circuit
583 - When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw
584 - Variable Control Relay Module circuit grounded
585 - A/C clutch circuit exceeded the normal current draw
586 - A/C clutch circuit open or shorted to power
587 - Data Communications Link (DCL) error
593 - Oxygen Sensor Heater circuit failure
617 - 1 - 2 shift error (E4OD)
618 - 2 - 3 shift error (E4OD)
619 - 3 - 4 shift error (E4OD)
621 - Shift solenoid #1 circuit failure
622 - Shift solenoid #2 circuit failure
623 - Overdrive light circuit failure
624 - Electronic Pressure Control solenoid or driver circuit failure
625 - Electronic Pressure Control driver open in EEC
626 - Coast clutch solenoid circuit failure (E4OD)
627 - Converter clutch solenoid circuit failure (E4OD)
628 - Converter clutch Lock-Up error (E4OD)
629 - Converter clutch control circuit failure
631 - Overdrive light circuit failure
632 - Overdrive cancel switch not changing state (E4OD)
633 - 4WD switch is closed
634 - Transmission Manual Lever Position Sensor circuit out of self test
636 - TOT sensor voltage out of self test range
637 - TOT sensor circuit above maximum voltage
638 - TOT sensor circuit below minimum voltage
639 - Insufficient input from the Transmission Speed Sensor
641 - Shift solenoid #3 circuit failure
643 - Converter Clutch Control circuit failure
645 - Incorrect gear ratio obtained for first gear
646 - Incorrect gear ratio obtained for second gear
647 - Incorrect gear ratio obtained for third gear
648 - Incorrect gear ratio obtained for fourth gear
649 - Electronic Pressure Control range failure
651 - Electronic Pressure Control circuit failure
652 - Modulated Converter Clutch Control solenoid output circuit error
653 - Transmission Control Switch was not cycled during KOER Self-Test
654 - MLP sensor not in park position
656 - Converter Clutch Control continuous slip error detected
657 - Transmission over temperature condition occurred
659 - High vehicle speed detected while the vehicle was in PARK
667 - Transmission Manual Lever Position Sensor circuit shorted
668 - Transmission Manual Lever Position Sensor circuit open
675 - MLP circuit voltage was out of the expected range
691 - 4WD switch circuit failure
998 - Hard fault present
Definitions:
ACT = Air Charge Temperature Sensor
BP = See MAP
EEC = Electronic Engine Control System
ECT = Engine Coolant Temperature Sensor
EGR = Exhaust Gas Recirculation Valve
EVP = EGR Valve Position Sensor
HEGO = Heated Exhaust Gas Oxygen Sensor
KOEO = Key On Engine Off
KOER = Key On Engine Running
MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor
MLP = Manual Lever Position
PCM = Powertrain Control Module
SPOUT = Distributor Jumper to Allow Initial Timing
TP = Throttle Position Sensor
Comments
1.Not all codes apply to all vehicles
2.Some codes have 2 listings, use the appropriate one
This info was found at Chilton's "FORD Full Size Trucks 1987-96 Repair Manual"
Here's another chart we found with some slight differences...
EEC-IV Diagnostic Codes, Rev. 1.1 2/25/93
11 (orc): No problems found in this portion of the test
12 (r): ECA could not increase idle speed above normal idle.
Suspect throttle body coking. KE1
13 (r): ECA could not lower idle speed.
Suspect Idle Bypass valve problems. KE15
14 (c): Intermittent PIP signal operation.
Suspect PIP sensor or TFI module, or grounding or
interference problems at the TFI module. Y1
15 (o): ECA ROM test failure- failure is internal to ECA.
(c) ECA KAM (Keep Alive RAM Memory) failure. Q10
18 (r*): Loss of TACH signal from TFI (Thick Film Integration- the module
on the side of the distributor) module to the ECA. There is an open in the SPOUT circuit.
Suspect SPOUT connector. N1
19 (o): Failure of ECA voltage regulator. Replace ECA.
21 (or): ECT (Engine Coolant Temp) out of range. Coolant is less than 50degF
for KOEO, or less than 180degF for KOER, or greater than 250degF for either.
If coolant temp is in proper range, suspect ECT sensor (It won't be, for KOER
tests on cars tha have a 160degF thermostat!) DE1, DE90
22 (orc*): MAP (Manifold Absolute Pressure, for speed-density cars) or
BP (Barometric Pressure, for mass-air cars) sensor signal out of range.
Suspect MAP or BP sensor and harness. DF1, DF90
23 (or): Closed throttle TP (Throttle Position) sensor voltage out of range.
Suspect TP sensor. DH1
One thing I noticed we are missing in this topic is a post with the codes and what they are for each test ran. SO HERE WE GO.
First are the two digit codes:
O= KOEO
R= KOER
M= memory, continuous
11 - System Pass (O,M,R)
12 - RPM Not Within Self Test Upper Limit (R), Idle Speed Control motor or Air Bypass not controlling idle properly -generally idle too low
13 - RPM Not Within Self Test Lower Limit (R), DC Motor Did Not Move (O,M,R), Idle Speed Control motor or Air Bypass not controlling idle properly -generally idle too high
14 - Profile Ignition Pickup Circuit Failure (M)
15 - Readout Memory Test Failed (O), Keep Alive Memory Test Failed (M)
16 - RPM Too Low To Perform o2 Sensor Test (R)
17 - RPM below Self-Test limit with Idle Air Control off (R)
18 - Spark Out (SPOUT) Circuit Open (R), Loss Of Ignition Diagnostic Module Input To PCM/SPOUT Circuit Grounded (M)
19 - Failure In PCM Internal Voltage (R), Erratic RPM During Hard Idle Self Test (R), Failure in EEC reference voltage (O)
21 - Engine Coolant Temperature, ECT Sensor Out Of Self Test Range. 0.3 volts (250?F) to 3.7 volts (50?F)(O,R)
22 - Manifold Absolute Pressure/Barometric Pressure Sensor Out Of Self Test Range (O,M,R)
23 - Throttle Position Sensor Out Of Self Test Range (O,M,R)
24 - Intake Air Temperature/Air Charge Temperature Sensor Out Of Self Test Range. 0.3 volts (250?F) to 3.7 volts (50?F)(O,R)
25 - Knock Not Sensed During Dynamic Response Test (R)
26 - Mass Air Flow Sensor was greater than 0.7 volts with engine off (O), MAF sensor was not between 0.2 and 1.5 volts with engine running (R).
28 - Loss Of Ignition Diagnostic Module RH Side (M)
29 - Insufficient Input From Vehicle Speed Sensor -To 1992 (M), Insufficient Input From Programmable Speedometer/Odometer Module -From 1993 (M)
31 - EGR Valve Position/Pressure Feedback EGR Circuit Below Minimum Voltage. 0.24 volts (O,M,R)
32 - EGR Valve Position/Pressure Feedback EGR Voltage Below Closed Voltage. 0.24 volts (O,M,R)
33 - EGR Valve Opening Not Detected (M,R)
34 - EGR Valve Position/Pressure Feedback EGR Voltage Above Closed Limit (O,R), PFE or EVP circuit has intermittently failed above the closed limit of 0.67 volts (M)
35 - EGR Valve Position/EGR Pressure Feedback EGR Circuit Above Maximum Voltage of 4.81 volts (O,R), PFE or EVP circuit has intermittently failed above the maximum limit of 4.81 volts (M)
36 - System Indicates Lean At Idle (R)
37 - System Indicates Rich At Idle (R)
39 - AXOD converter bypass clutch not applying properly (M)
41 - System Indicates Lean -passenger side(R), No o2 Sensor Switching Detected. always lean -passenger side(M)
42 - System Indicates Rich -passenger side(R), No o2 Sensor Switching Detected. always rich -passenger side(M)
43 - o2 Sensors indicate lean at Full Throttle (M)
44 - Secondary Air System Inoperative. bank one, passenger side (R)
45 - Secondary Air Upstream During Self Test (R)
46 - Secondary Air Not Bypassed During Self Test (R)
47 - Measured Air Flow Low At Base Idle (R)
48 - Measured air flow too high at base idle (R)
49 - 1?2 Shift Error (M)
51 - Engine Coolant Temperature Circuit Open (M,O)
52 - Power Steering Pressure Switch Circuit Open (O), Power Steering Pressure Switch Circuit Did Not Change States (R)
53 - Throttle Position Sensor Circuit Above Maximum Voltage (M,O)
54 - Intake Air Temperature/Air Charge Temperature Circuit Open (M,O,R)
55 - Key Power Check (R)
56 - Mass Air Flow/Vane Air Flow Sensor Circuit Above Maximum Voltage (O,M,R), MAF Sensor short to power (M,R), Transmission Fluid Temperature Circuit Open (M,O)
57 - AXOD Neutral pressure switch circuit failed open (M)
58 - Idle Tracking Switch Circuit Open Or Grounded -CFI (O,R), Vane Air Temperature Sensor Input Greater Than Self Test Maximum -EFI (M,O)
59 - 2?3 Shift Error (M), AXOD 4/3 Pressure Switch Circuit Failed Closed (O), AXOD 4/3 Pressure Switch Circuit Failed Open (M)
61 - ECT Sensor Circuit Grounded (O,M,R)
62 - Torque Converter Clutch Error (M), AXOD 4/3 Or 3/2 Pressure Switch Circuit Grounded (O)
63 - Throttle Position Sensor Circuit Below Minimum Voltage (O,M,R)
64 - Intake Air Temperature/Air Charge Temperature Circuit Grounded (O,M,R)
65 - Transmission Control Switch/Overdrive Cancel Switch Circuit Did Not Change States (R)
66 - , MAF signal below minimum test voltage of .4vdc (O,M,R), Transmission Fluid Temperature Circuit Grounded (M,O)
67 - Park Neutral Position Switch Circuit Open; A/C On -Manual (O), Manual Lever Position Sensor Out Of Range/A/C On (M,O), Clutch Switch Circuit Failure (M)
68 - Transmission recently overheated, or TOT sensor intermittently failed below 0.2 volts (M)
69 - 3?4 Shift Error (M)
71 - Software re-initialization detected or Cluster Control Assembly circuit failed (M)
72 - Insufficient Manifold Absolute Pressure/Mass Air Flow Change During Dynamic Response Test (R)
73 - Insufficient Throttle Position Change During Dynamic Response Test (O,R)
74 - Brake On/Off Circuit Open?Not During Self Test (M,R)
75 - Brake On/Off Circuit Closed/ECA Input Open (R)
76 - Insufficient Vane Air Flow Sensor Output Change During Dynamic Response Test (R)
77 - Operator Error Dynamic Response Test (R)
78 - Re-Initalization Check (R)
79 - A/C On/Defrost On During Self Test (O)
81 - Secondary Air Diverter Circuit Failure (O)
82 - Secondary Air Bypass Circuit Failure (O)
83 - EGR Control solenoid circuit failure (O)
84 - EGR Vacuum Regulator (EVR) Control Circuit Failure (O)
85 - CANP Circuit Failure (O)
86 - Adaptive fuel limit reached (M), 3 ? 4 Shift solenoid circuit failure (O)
87 - Primary Fuel Pump Circuit Failure (M,O)
88 - Loss Of Dual Plug Input Control (M), Throttle Kicker Fault
89 - Converter clutch solenoid circuit failure (M)
91 - o2 Sensor Circuit Indicates Lean -driver side(R), No o2 Sensor Switching Detected. always lean -driver side(M), Shift Solenoid 1 Circuit Failure (O)
92 - o2 Sensor Circuit Indicates Rich -driver side(R), No o2 Sensor Switching Detected. always rich -driver side(M), Shift Solenoid 2 Circuit Failure (O)
93 - Converter Clutch Solenoid Circuit Failure (O)
94 - Secondary Air Injection Inoperative. bank two, driver side (R), Torque Converter Clutch Solenoid Circuit Failure (O)
95 - Fuel Pump Circuit Open-PCM To Motor Ground (M,O)
96 - Fuel Pump Circuit Open-Battery To PCM (M,O)
97 - Transmission Control Indicator Lamp Circuit Failure (O)
98 - Hard Fault Present (R)
99 - Electronic Pressure Control Circuit Failure (M,O)
Next, 3 Digit codes
O= KOEO
R= KOER
M= memory, continuous
111 - System Pass
112 - ACT Sensor Circuit Below Minimum Voltage of 0.2 volts (O), ACT circuit has intermittently failed below minimum 0.2 volts (M)
113 - ACT Sensor Circuit Above Maximum Voltage of 4.6 volts (O), ACT circuit has intermittently failed above the maximum of 4.6 volts (M)
114 - ACT out of self test range 0.3 to 3.7 volts
116 - ECT out of self test range 0.3 to 3.7 volts
117 - ECT Sensor Circuit Below Minimum Voltage of 0.2 volts(O), ECT circuit has intermittently failed below minimum 0.2 volts (M)
118 - ECT Sensor Circuit Above Maximum Voltage of 4.6 volts (O), ECT sensor circuit has intermittently failed above the maximum of 4.6 volts (M)
121 - Closed throttle TPS voltage higher or lower than expected (O,R), TP sensor was inconsistent with the MAF/MAP value in the last 80 drive cycles (M)
122 - TPS circuit below minimum 0.6 volts (O), TPS circuit has intermittently failed below minimum 0.6 volts (M)
123 - TP circuit above maximum 4.5 volts (O), TPS circuit has intermittently failed above maximum 4.5 volts (M)
124 - TP sensor was higher than expected with the MAF/MAP value in the last 80 drive cycles (M)
125 - TP sensor was lower than expected with the MAF/MAP value in the last 80 drive cycles (M)
126 - MAP/BP sensor out of self test range 1.4 to 1.6 volts
128 - MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation
129 - Insufficient MAF/MAP change during Dynamic Response Test
136 - o2 Sensor circuit indicates system lean (left side)
137 - o2 Sensor circuit indicates system rich (left side)
139 - No HEGO sensor switching detected or disconnected (left side)
141 - o2 Sensor circuit indicates system lean (both sides)
144 - No o2 Sensor switching detected or disconnected (right side)
157 - MAF sensor went below 0.4 volts during the last 80 warm-up cycles
158 - MAF sensor went above 4.5 volts during the last 80 warm-up cycles
159 - MAF signal was greater than 0.70 volt during KOEO (O), MAF signal was not between 0.20 and 1.50 volts during KOER (R)
167 - TPS did not exceed 25% rotation during the Dynamic Response Test
171 - Fuel system at adaptive limit, o2 Sensor unable to switch (right side)
172 - o2 Sensor sensor circuit indicates system lean (right side)
173 - o2 Sensor sensor circuit indicates system rich (right side)
174 - o2 Sensor switching time is slow
175 - Fuel system at adaptive limit, o2 Sensor unable to switch(left side, (Bank No. 2))
176 - o2 Sensor circuit indicates system lean (left side)
177 - o2 Sensor circuit indicates system rich (left side)
178 - o2 Sensor switching time is slow (Bank No. 1)
179 - Right side still rich, at leanest adaptive limit, during part throttle
181 - Right side still lean, at richest adaptive limit, during part throttle
182 - Right side still rich, at leanest adaptive limit, at idle
183 - Right side still lean, at richest adaptive limit, at idle
184 - MAF higher than expected
185 - MAF lower than expected
186 - Injector pulse width longer than expected
187 - Injector pulse width shorter than expected
188 - Left side still rich, at leanest adaptive limit, during part throttle
189 - Left side still lean, at richest adaptive limit, during part throttle
191 - Left side still rich, at leanest adaptive limit, at idle
192 - Left side still lean, at richest adaptive limit, at idle
193 - Flexible Fuel sensor circuit failure
194 - Run cylinder balance diagnostic test
195 - Run cylinder balance diagnostic test
211 - Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall
212 - Loss of IDM (Ignition Diagnostic Monitor) input to EEC or SPOUT circuit grounded
213 - SPOUT circuit open
214 - Cylinder Identification (CID) circuit failure
215 - EEC detected coil 1 primary circuit failure
216 - EEC detected coil 2 primary circuit failure
217 - EEC detected coil 3 primary circuit failure
218 - Loss of IDM (Ignition Diagnostic Monitor) signal (left side)
219 - SPOUT failure, spark timing has defaulted to 10 degrees BTDC
222 - Loss of IDM (Ignition Diagnostic Monitor)signal (right side)
223 - Loss of Dual Plug Inhibit control
224 - Erratic IDM (Ignition Diagnostic Monitor)input to processor
225 - Knock Sensor (KS) signal not sensed during dynamic response test
226 - IDM (Ignition Diagnostic Monitor)signal not received
244 - Camshaft Position (CMP) Sensor failure
311 - Thermactor air system inoperative (right side)
312 - Thermactor air misdirected upstream during self test
313 - Thermactor air not bypassed during self test
314 - Thermactor air system inoperative (left side)
326 - PFE or DPFE circuit voltage lower than expected with zero EVR duty cycle
327 - DPFE or EVP circuit below minimum voltage of 0.2 volts
328 - EVP circuit below minimum voltage of 0.24 volts
332 - EGR valve opening not detected
334 - DPFE or EVP circuit above the closed limit of 0.67 volts
335 - PFE or DPFE sensor voltage out of Self-Test range
336 - EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle
337 - DPFE or EVP circuit above the maximum limit of 4.81 volts
338 - ECT lower than expected
339 - ECT higher than expected
341 - Octane Adjust shorting bar is not in or the OCT ADJ circuit is open
381 - Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds
411 - Cannot control rpm during KOER low RPM check
412 - Cannot control rpm during KOER high RPM check
452 - Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles
461 - Engine over speed was detected
511 - EEC permanent Read Only Memory (ROM) test failed
512 - EEC battery powered Keep Alive Memory (KAM) test failed
513 - Failure in EEC processor internal voltage
519 - Power steering pressure switch circuit open
521 - Power steering pressure switch did not change state during KOER test
522 - Vehicle not in PARK or NEUTRAL during KOEO
524 - When the PCM commanded the fuel pump on, voltage was not detected on FPM
525 - Vehicle in gear or A/C on during Self-Test
526 - Neutral Pressure Switch closed or A/C on
527 - Neutral Drive Switch open or A/C on
528 - Clutch Switch Circuit failure
529 - Data Communications Link or Electronic Instrument Cluster circuit failure
532 - Data Communications Link or Electronic Instrument Cluster circuit failure
533 - Data Communications Link or Electronic Instrument Cluster circuit failure
536 - Brake On/Off circuit failure / switch not actuated during KOER test
538 - Insufficient RPM change during KOER dynamic response test/ Operator error
539 - A/C or Defroster ON during KOEO test
542 - Fuel pump circuit failure
543 - When the PCM commanded the fuel pump on, voltage was not detected on FPM
551 - Intake Manifold Runner Control (IMRC) circuit failure
552 - Air management 1 circuit failure (AM1/TAB)
553 - Air management 2 circuit failure (AM1/TAD)
554 - Fuel Pressure Regulator Control (FPRC) solenoid circuit failure
556 - Fuel Pump circuit failure
557 - Fuel pump relay coil resistance failure
558 - EGR Vacuum Regulator circuit failure
559 - Air Conditioning On relay circuit failure
563 - High Speed Electro-Drive Fan circuit failure
564 - Electro-Drive Fan circuit failure
565 - Canister purge circuit failure
566 - 3 ? 4 Shift Solenoid failure
569 - Canister purge 2 circuit failure
571 - EGR Atmospheric Regulator circuit failure
572 - EGR Vacuum Regulator circuit failure
578 - A/C Pressure (ACP) sensor VREF circuit is short to ground
579 - A/C Pressure (ACP) sensor circuit is above maximum voltage
581 - When the cooling fan was activated, the circuit exceeded current draw
582 - Open or short to power in the power-to-cooling fan circuit
583 - When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw
584 - Variable Control Relay Module circuit grounded
585 - A/C clutch circuit exceeded the normal current draw
586 - A/C clutch circuit open or shorted to power
587 - Data Communications Link (DCL) error
593 - Oxygen Sensor Heater circuit failure
617 - 1 - 2 shift error (E4OD)
618 - 2 - 3 shift error (E4OD)
619 - 3 - 4 shift error (E4OD)
621 - Shift solenoid #1 circuit failure
622 - Shift solenoid #2 circuit failure
623 - Overdrive light circuit failure
624 - Electronic Pressure Control solenoid or driver circuit failure
625 - Electronic Pressure Control driver open in EEC
626 - Coast clutch solenoid circuit failure (E4OD)
627 - Converter clutch solenoid circuit failure (E4OD)
628 - Converter clutch Lock-Up error (E4OD)
629 - Converter clutch control circuit failure
631 - Overdrive light circuit failure
632 - Overdrive cancel switch not changing state (E4OD)
633 - 4WD switch is closed
634 - Transmission Manual Lever Position Sensor circuit out of self test
636 - TOT sensor voltage out of self test range
637 - TOT sensor circuit above maximum voltage
638 - TOT sensor circuit below minimum voltage
639 - Insufficient input from the Transmission Speed Sensor
641 - Shift solenoid #3 circuit failure
643 - Converter Clutch Control circuit failure
645 - Incorrect gear ratio obtained for first gear
646 - Incorrect gear ratio obtained for second gear
647 - Incorrect gear ratio obtained for third gear
648 - Incorrect gear ratio obtained for fourth gear
649 - Electronic Pressure Control range failure
651 - Electronic Pressure Control circuit failure
652 - Modulated Converter Clutch Control solenoid output circuit error
653 - Transmission Control Switch was not cycled during KOER Self-Test
654 - MLP sensor not in park position
656 - Converter Clutch Control continuous slip error detected
657 - Transmission over temperature condition occurred
659 - High vehicle speed detected while the vehicle was in PARK
667 - Transmission Manual Lever Position Sensor circuit shorted
668 - Transmission Manual Lever Position Sensor circuit open
675 - MLP circuit voltage was out of the expected range
691 - 4WD switch circuit failure
998 - Hard fault present
Definitions:
ACT = Air Charge Temperature Sensor
BP = See MAP
EEC = Electronic Engine Control System
ECT = Engine Coolant Temperature Sensor
EGR = Exhaust Gas Recirculation Valve
EVP = EGR Valve Position Sensor
HEGO = Heated Exhaust Gas Oxygen Sensor
KOEO = Key On Engine Off
KOER = Key On Engine Running
MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor
MLP = Manual Lever Position
PCM = Powertrain Control Module
SPOUT = Distributor Jumper to Allow Initial Timing
TP = Throttle Position Sensor
Comments
1.Not all codes apply to all vehicles
2.Some codes have 2 listings, use the appropriate one
This info was found at Chilton's "FORD Full Size Trucks 1987-96 Repair Manual"
Here's another chart we found with some slight differences...
EEC-IV Diagnostic Codes, Rev. 1.1 2/25/93
11 (orc): No problems found in this portion of the test
12 (r): ECA could not increase idle speed above normal idle.
Suspect throttle body coking. KE1
13 (r): ECA could not lower idle speed.
Suspect Idle Bypass valve problems. KE15
14 (c): Intermittent PIP signal operation.
Suspect PIP sensor or TFI module, or grounding or
interference problems at the TFI module. Y1
15 (o): ECA ROM test failure- failure is internal to ECA.
(c) ECA KAM (Keep Alive RAM Memory) failure. Q10
18 (r*): Loss of TACH signal from TFI (Thick Film Integration- the module
on the side of the distributor) module to the ECA. There is an open in the SPOUT circuit.
Suspect SPOUT connector. N1
19 (o): Failure of ECA voltage regulator. Replace ECA.
21 (or): ECT (Engine Coolant Temp) out of range. Coolant is less than 50degF
for KOEO, or less than 180degF for KOER, or greater than 250degF for either.
If coolant temp is in proper range, suspect ECT sensor (It won't be, for KOER
tests on cars tha have a 160degF thermostat!) DE1, DE90
22 (orc*): MAP (Manifold Absolute Pressure, for speed-density cars) or
BP (Barometric Pressure, for mass-air cars) sensor signal out of range.
Suspect MAP or BP sensor and harness. DF1, DF90
23 (or): Closed throttle TP (Throttle Position) sensor voltage out of range.
Suspect TP sensor. DH1
