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Diagnostic Trouble Codes - 1995 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.

  1. Start engine and bring to normal operating temperature. If engine will not start or stalls after starting, proceed with next step.
  2. Turn the key "OFF", then wait ten seconds.
  3. Activate the self test by grounding the Self-Test Input (STI) connector.
  4. Turn the ignition key "ON".
  5. Record all codes received.
  6. Turn ignition "OFF".


Data Link Connector (DLC)
(Located Underhood)



Analog Voltmeter Connection

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