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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.

  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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© 2003 Vincent T. Ciulla

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