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  1. #1
    GREG@SN95
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    OBDI EEC-IV Diagnostic Codes

    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

  2. #2


    Senior Member Venom351R's Avatar
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    Re: OBDI EEC-IV Diagnostic Codes

    would also like to add that if the code 10 is shown its not a fault code. Its a separation code used to separate the first group of codes (KOEO Self Test Codes) from the continuous memory group of codes.

    Also code 511 is normal for any car with a chip.
    1994 SVT Cobra w/ 95 Cobra R drivetrain 351W

    ENGINE FTI Custom CNC Ported 234HR TrickFlow High Port Heads, FTI Camshaft, Edelbrock Victor 5.8, PMAS 95MM Meter, Tremec 3550

    Exhaust Accufab 1 3/4 Long Tubes, Custom 3" H pipe, Magnaflow Cat Back

    Suspension Team Z K Member, Strange 10 way shocks and struts with coilovers, Team Z Double Adjustable Upper Control Arms, Maximum Motorsport Lowers

    Misc
    Centerforce DF clutch, 4.10's, Pro 5.0 Shifter

    2007 Subaru STI, Stock - 13.8 @ 102 MPH

  3. #3


    Member 1slow50's Avatar
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    Anybody know what could cause code 512?

    Sent from my PC36100 using Tapatalk 2

 

 

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