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Message: <blockquote data-quote="GREG@SN95" data-source="post: 637772">EEC-IV Diagnostic CodesOne 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= KOEOR= KOERM= memory, continuous11 - 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 low13 - 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 high14 - 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 Fault89 - 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 codesO= KOEOR= KOERM= memory, continuous111 - System Pass112 - 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 volts116 - ECT out of self test range 0.3 to 3.7 volts117 - 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 volts128 - MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation129 - Insufficient MAF/MAP change during Dynamic Response Test136 - 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 cycles158 - MAF sensor went above 4.5 volts during the last 80 warm-up cycles159 - 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 Test171 - 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 slow175 - 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 throttle181 - Right side still lean, at richest adaptive limit, during part throttle182 - Right side still rich, at leanest adaptive limit, at idle183 - Right side still lean, at richest adaptive limit, at idle184 - MAF higher than expected185 - MAF lower than expected186 - Injector pulse width longer than expected187 - Injector pulse width shorter than expected188 - Left side still rich, at leanest adaptive limit, during part throttle189 - Left side still lean, at richest adaptive limit, during part throttle191 - Left side still rich, at leanest adaptive limit, at idle192 - Left side still lean, at richest adaptive limit, at idle193 - Flexible Fuel sensor circuit failure194 - Run cylinder balance diagnostic test195 - Run cylinder balance diagnostic test211 - Two or more successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall212 - Loss of IDM (Ignition Diagnostic Monitor) input to EEC or SPOUT circuit grounded213 - SPOUT circuit open214 - Cylinder Identification (CID) circuit failure215 - EEC detected coil 1 primary circuit failure216 - EEC detected coil 2 primary circuit failure217 - EEC detected coil 3 primary circuit failure218 - Loss of IDM (Ignition Diagnostic Monitor) signal (left side)219 - SPOUT failure, spark timing has defaulted to 10 degrees BTDC222 - Loss of IDM (Ignition Diagnostic Monitor)signal (right side)223 - Loss of Dual Plug Inhibit control224 - Erratic IDM (Ignition Diagnostic Monitor)input to processor225 - Knock Sensor (KS) signal not sensed during dynamic response test226 - IDM (Ignition Diagnostic Monitor)signal not received244 - Camshaft Position (CMP) Sensor failure311 - Thermactor air system inoperative (right side)312 - Thermactor air misdirected upstream during self test313 - Thermactor air not bypassed during self test314 - Thermactor air system inoperative (left side)326 - PFE or DPFE circuit voltage lower than expected with zero EVR duty cycle327 - DPFE or EVP circuit below minimum voltage of 0.2 volts328 - EVP circuit below minimum voltage of 0.24 volts332 - EGR valve opening not detected334 - DPFE or EVP circuit above the closed limit of 0.67 volts335 - PFE or DPFE sensor voltage out of Self-Test range336 - EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle337 - DPFE or EVP circuit above the maximum limit of 4.81 volts338 - ECT lower than expected339 - ECT higher than expected341 - Octane Adjust shorting bar is not in or the OCT ADJ circuit is open381 - Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds411 - Cannot control rpm during KOER low RPM check412 - Cannot control rpm during KOER high RPM check452 - Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles461 - Engine over speed was detected511 - EEC permanent Read Only Memory (ROM) test failed512 - EEC battery powered Keep Alive Memory (KAM) test failed513 - Failure in EEC processor internal voltage519 - Power steering pressure switch circuit open521 - Power steering pressure switch did not change state during KOER test522 - Vehicle not in PARK or NEUTRAL during KOEO524 - When the PCM commanded the fuel pump on, voltage was not detected on FPM525 - Vehicle in gear or A/C on during Self-Test526 - Neutral Pressure Switch closed or A/C on527 - Neutral Drive Switch open or A/C on528 - Clutch Switch Circuit failure529 - Data Communications Link or Electronic Instrument Cluster circuit failure532 - Data Communications Link or Electronic Instrument Cluster circuit failure533 - Data Communications Link or Electronic Instrument Cluster circuit failure536 - Brake On/Off circuit failure / switch not actuated during KOER test538 - Insufficient RPM change during KOER dynamic response test/ Operator error539 - A/C or Defroster ON during KOEO test542 - Fuel pump circuit failure543 - When the PCM commanded the fuel pump on, voltage was not detected on FPM551 - Intake Manifold Runner Control (IMRC) circuit failure552 - Air management 1 circuit failure (AM1/TAB)553 - Air management 2 circuit failure (AM1/TAD)554 - Fuel Pressure Regulator Control (FPRC) solenoid circuit failure556 - Fuel Pump circuit failure557 - Fuel pump relay coil resistance failure558 - EGR Vacuum Regulator circuit failure559 - Air Conditioning On relay circuit failure563 - High Speed Electro-Drive Fan circuit failure564 - Electro-Drive Fan circuit failure565 - Canister purge circuit failure566 - 3 ? 4 Shift Solenoid failure569 - Canister purge 2 circuit failure571 - EGR Atmospheric Regulator circuit failure572 - EGR Vacuum Regulator circuit failure578 - A/C Pressure (ACP) sensor VREF circuit is short to ground579 - A/C Pressure (ACP) sensor circuit is above maximum voltage581 - When the cooling fan was activated, the circuit exceeded current draw582 - Open or short to power in the power-to-cooling fan circuit583 - When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw584 - Variable Control Relay Module circuit grounded585 - A/C clutch circuit exceeded the normal current draw586 - A/C clutch circuit open or shorted to power587 - Data Communications Link (DCL) error593 - Oxygen Sensor Heater circuit failure617 - 1 - 2 shift error (E4OD)618 - 2 - 3 shift error (E4OD)619 - 3 - 4 shift error (E4OD)621 - Shift solenoid #1 circuit failure622 - Shift solenoid #2 circuit failure623 - Overdrive light circuit failure624 - Electronic Pressure Control solenoid or driver circuit failure625 - Electronic Pressure Control driver open in EEC626 - 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 failure631 - Overdrive light circuit failure632 - Overdrive cancel switch not changing state (E4OD)633 - 4WD switch is closed634 - Transmission Manual Lever Position Sensor circuit out of self test636 - TOT sensor voltage out of self test range637 - TOT sensor circuit above maximum voltage638 - TOT sensor circuit below minimum voltage639 - Insufficient input from the Transmission Speed Sensor641 - Shift solenoid #3 circuit failure643 - Converter Clutch Control circuit failure645 - Incorrect gear ratio obtained for first gear646 - Incorrect gear ratio obtained for second gear647 - Incorrect gear ratio obtained for third gear648 - Incorrect gear ratio obtained for fourth gear649 - Electronic Pressure Control range failure651 - Electronic Pressure Control circuit failure652 - Modulated Converter Clutch Control solenoid output circuit error653 - Transmission Control Switch was not cycled during KOER Self-Test654 - MLP sensor not in park position656 - Converter Clutch Control continuous slip error detected657 - Transmission over temperature condition occurred659 - High vehicle speed detected while the vehicle was in PARK667 - Transmission Manual Lever Position Sensor circuit shorted668 - Transmission Manual Lever Position Sensor circuit open675 - MLP circuit voltage was out of the expected range691 - 4WD switch circuit failure998 - Hard fault presentDefinitions: 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 test12 (r): ECA could not increase idle speed above normal idle. Suspect throttle body coking. KE113 (r): ECA could not lower idle speed. Suspect Idle Bypass valve problems. KE1514 (c): Intermittent PIP signal operation. Suspect PIP sensor or TFI module, or grounding orinterference problems at the TFI module. Y115 (o): ECA ROM test failure- failure is internal to ECA. (c) ECA KAM (Keep Alive RAM Memory) failure. Q1018 (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. N119 (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, DE9022 (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, DF9023 (or): Closed throttle TP (Throttle Position) sensor voltage out of range. Suspect TP sensor. DH1</blockquote>