Diagnostic Trouble Codes - 1994
Ford
| 111 | System PASS. |
| 112 | ACT sensor circuit grounded. |
| 113 | ACT sensor circuit open. |
| 114 | ACT sensor is out of Self-Test. |
| 116 | ECT sensor is out of Self-Test. |
| 117 | ECT sensor circuit grounded. |
| 118 | ECT sensor circuit open. |
| 121 | TP sensor is out of Self-Test. |
| 122 | TP sensor input is less than Self-Test minimum. |
| 123 | TP sensor input is greater than Self-Test maximum. |
| 124 | TP sensor input voltage is greater than expected. |
| 125 | TP sensor input voltage is less than expected. |
| 128 | MAP vacuum hose damaged or disconnected. |
| 129 | Insufficient MAF input. |
| 136 | HEGO sensor circuit indicates system lean (Right HEGO). |
| 137 | HEGO sensor circuit indicates system rich (Right HEGO). |
| 139 | No HEGO switching (Front Side). |
| 141 | Fuel system indicates lean. |
| 144 | No HEGO switching (Left Side). |
| 157 | MAF sensor circuit open. |
| 158 | MAF sensor shorted to power. |
| 159 | MAF sensor is out of Self-Test. |
| 167 | Insufficient TP input change. |
| 171 | Lack of HEGO switching (Rear Side). |
| 172 | HEGO sensor circuit indicates lean. (Rear Side). |
| 173 | HEGO sensor circuit indicates rich. (Rear Side). |
| 174 | Check for diluted engine oil. |
| 175 | Lack of HEGO switching (Front Side). |
| 176 | HEGO sensor circuit indicates lean. (Front Side). |
| 177 | HEGO sensor circuit indicates rich. (Front Side). |
| 178 | Check for diluted engine oil. |
| 179 | Fuel system at part throttle lean adaptive limit, system rich (Rear Side). |
| 181 | Fuel system at part throttle rich adaptive limit, system lean (Rear Side). |
| 182 | Fuel system at idle lean adaptive limit, system rich (Rear Side). |
| 183 | Fuel system at idle rich adaptive limit, system lean (Rear Side). |
| 184 | MAF sensor input voltage is greater than expected, in range. |
| 185 | MAF sensor input voltage is less than expected, in range. |
| 186 | Closed loop injector pulse width longer than expected. |
| 187 | Closed loop injector pulse width shorter than expected. |
| 188 | Fuel system at part throttle lean adaptive limit, system rich (Front Side). |
| 189 | Fuel system at part throttle rich adaptive limit, system lean (Front Side). |
| 193 | Flexible Fuel sensor circuit failure. |
| 211 | PIP circuit failure. |
| 212 | Loss of tachometer/IDM input. |
| 213 | EEC SPOUT circuit open. |
| 214 | CID circuit failure. |
| 215 | PCM detected coil 1 primary circuit failure. |
| 216 | PCM detected coil 2 primary circuit failure. |
| 217 | PCM detected coil 3 primary circuit failure. |
| 218 | Loss of ignition diagnostic monitor signal-left side. |
| 219 | Spark timing defaulted to 10 degrees, spark output circuit open. |
| 221 | Spark timing error. |
| 222 | Loss of ignition diagnostic monitor signal-right side. |
| 223 | Loss of dual plug inhibit control. |
| 224 | PCM detected coil 1, 2, 3 or 4 primary circuit failure. |
| 225 | Knock not sensed during dynamic response test KOER. |
| 226 | Ignition diagnostic monitor signal not received. |
| 232 | PCM detected coil 1, 2, 3 or 4 primary circuit failure. |
| 238 | PCM detected coil 4 primary circuit failure. |
| 241 | Ignition control module to PCM ignition diagnostic monitor pulse width transmission error. |
| 244 | Cylinder Identification circuit fault present when cylinder balance test requested. |
| 311 | Secondary air injection system inoperative during KOER self-test (bank #1). |
| 312 | Secondary air injection system misdirected during KOER self-test. |
| 313 | Secondary air injection system not bypassed during KOER self-test. |
| 314 | Secondary air injection system inoperative during KOER self-test (bank #2) |
| 326 | PFE sensor circuit voltage lower than expected. |
| 327 | PFE sensor circuit voltage below Self-Test minimum. |
| 328 | Exhaust gas recirculation valve position sensor closed voltage lower than expected. |
| 332 | Insufficient EGR flow. |
| 334 | Exhaust gas recirculation valve position sensor closed voltage higher than expected. |
| 335 | PFE sensor circuit voltage out of Self-Test range. |
| 336 | PFE sensor circuit voltage higher than expected. |
| 337 | PFE sensor circuit voltage above Self-Test maximum. |
| 338 | Engine coolant temperature lower than expected (thermostat test). |
| 339 | Engine coolant temperature higher than expected (thermostat test). |
| 341 | Octane adjust service pin open. |
| 381 | Frequent A/C clutch cycling. |
| 411 | Cannot control RPM during KOER low RPM check. |
| 412 | Cannot control RPM during KOER high RPM check. |
| 415 | Idle Air Control system at maximum adaptive lower limit. |
| 416 | Idle Air Control system at upper adaptive learning limit. |
| 452 | Insufficient input from VSS. |
| 453 | Servo leaking down. |
| 454 | Servo leaking. |
| 455 | Insufficient RPM increase. |
| 456 | Insufficient RPM decrease. |
| 457 | Speed control command switch(s) circuit not functioning. |
| 458 | Speed control command switch(s) stuck/circuit grounded. |
| 459 | Speed control ground circuit open. |
| 511 | ROM test failure. |
| 512 | KAM test failure. |
| 513 | EEC internal voltage failure. |
| 519 | PSPS circuit open. |
| 521 | PSPS circuit did not change. |
| 522 | Vehicle not in PARK or NEUTRAL during KOEO. |
| 525 | Indicates vehicle in gear or A/C "ON" during self-test. |
| 527 | Park/Neutral Position switch circuit open or A/C on KOEO self-test. |
| 528 | Clutch Pedal Position switch circuit failure. |
| 529 | Data Communication Link or PCM circuit failure. |
| 532 | Cluster Control Assembly circuit failure. |
| 533 | Data Communication Link or Electronic Instrument Cluster circuit failure. |
| 536 | Brake On/Off circuit failure/not activated during KOER. |
| 538 | Insufficient RPM change during KOER Dynamic Response Test. |
| 539 | A/C or defrost "ON" during Self-Test. |
| 542 | Fuel pump circuit open, EEC processor to motor ground. |
| 543 | Fuel pump circuit open, battery to EEC processor. |
| 551 | Idle Air Control circuit failure during KOEO self-test. |
| 552 | Secondary Air Injection Bypass circuit failure during KOEO self-test. |
| 553 | Secondary Air Injection Diverter circuit failure during KOEO self-test. |
| 554 | Fuel Pressure Regulator Control circuit failure. |
| 556 | Fuel pump circuit failure. |
| 557 | Low speed fuel pump primary circuit failure. |
|
|
Electronic Vacuum regulator circuit failure. |
| 559 | Air Conditioning On relay circuit failure during KOEO self-test. |
| 562 | Pusher fan control primary circuit failure. |
| 563 | High speed Electro Drive Fan circuit failure. |
| 564 | Electro Drive Fan circuit failure |
| 565 | Canister purge (CANP) circuit failure. |
| 566 | 3-4 shift solenoid circuit failure during KOEO self-test. |
| 567 | Speed Control Vent (SCVNT) circuit failure. |
| 568 | Speed Control Vacuum (SCVAC) circuit failure. |
| 569 | Auxiliary Canister Purge circuit failure during KOEO self-test. |
| 571 | EGR Atmospheric (EGRA) solenoid circuit failure during KOEO self-test. |
| 572 | EGR Vacuum (EGRV) solenoid circuit failure during KOEO self-test. |
| 578 | A/C pressure sensor circuit shorted. |
| 579 | Insufficient A/C pressure change. |
| 581 | "Power to Fan" circuit over current. |
| 582 | Fan circuit open. |
| 583 | Power to Fuel pump over current. |
| 584 | Variable Control Relay Module (VCRM) power ground circuit open (VCRM Pin 1). |
| 585 | Power to A/C clutch over current. |
| 586 | A/C clutch circuit open. |
| 587 | Variable Control Relay Module communication failure. |
| 593 | Heated Oxygen Sensor (HO2S) heater circuit failure. |
| 617 | 1-2 shift error. |
| 618 | 2-3 shift error. |
| 619 | 3-4 shift error. |
| 621 | Shift solenoid #1 circuit failure. |
| 622 | Shift solenoid #2 circuit failure. |
| 623 | Transmission Control Indicator Light circuit failure. |
| 624 | EPC solenoid or driver failure. |
| 625 | EPC solenoid driver open in EEC processor. |
| 626 | Coast Clutch Solenoid (CCS) circuit failure during KOEO self-test. |
| 627 | Torque Converter Clutch solenoid circuit failure. |
| 628 | Lock-up solenoid circuit failure, excessive clutch slippage. |
| 629 | Lock-up solenoid circuit failure. |
| 631 | Transmission Control Indicator Lamp circuit failure during KOEO self-test. |
| 632 | Transmission Control Switch circuit did not change states during KOER self-test. |
| 633 | 4x4 Light switch closed during KOEO self-test. |
| 634 | MLP sensor voltage out of Self-Test range. |
| 636 | Transmission oil temperature sensor voltage out of Self-Test range. |
| 637 | Transmission oil temperature sensor voltage above Self-Test maximum. |
| 638 | Transmission oil temperature sensor voltage below Self-Test minimum. |
| 639 | Insufficient input from turbine speed sensor. |
| 641 | Shift solenoid #3 circuit failure. |
| 643 | Torque Converter Clutch 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 | EPC range failure. |
| 651 | EPC circuit failure. |
| 652 | Torque Converter Clutch solenoid circuit failure. |
| 653 | Transmission Control Switch did not change states during KOER self-test. |
| 654 | Transmission Range sensor not indicating "PARK" during KOEO self-test. |
| 656 | Torque Converter Clutch continuous slip error. |
| 657 | Transmission over temperature condition occurred. |
| 659 | High vehicle speed in park indicated. |
| 667 | Transmission Range sensor circuit voltage below minimum voltage. |
| 668 | Transmission Range circuit voltage above maximum voltage. |
| 675 | Transmission Range sensor circuit voltage out of range. Hard fault present, vehicle is in Failure Mode Effects Management (FMEM). |
| 998 | Hard faults present. |
To extract DTCs from the computer for diagnostic purposes, the Self Test connector is used.
- Start engine and bring to normal operating temperature. If engine will not start or stalls after starting, proceed with next step.
- Turn the key "OFF", then wait ten seconds.
- Activate the self test by grounding the Self-Test Input (STI) connector.
- Turn the ignition key "ON".
- Record all codes received.
- Turn ignition "OFF".
Data Link Connector (DLC)
(Located Underhood)
Analog Voltmeter Connection
© 2003 Vincent T. Ciulla
