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Diagnostic Trouble Codes - 1992
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.
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).
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).
175 Lack of HEGO switching (Front Side).
176 HEGO sensor circuit indicates lean. (Front Side).
177 HEGO sensor circuit indicates rich. (Front Side).
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).
191 Fuel system at idle lean adaptive limit, system rich (Front Side).
192 Fuel system at idle rich adaptive limit, system lean (Front Side).
211 PIP circuit failure.
212 Loss of tachometer/IDM input.
213 EEC SPOUT circuit open.
214 CID circuit failure.
326 PFE sensor circuit voltage lower than expected.
327 PFE sensor circuit voltage below Self-Test minimum.
332 Insufficient EGR flow.
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.
411 Cannot control RPM during KOER low RPM check.
412 Cannot control RPM during KOER high RPM check.
452 Insufficient input from VSS.
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.
536 Brake On/Off circuit failure/not activated during KOER.
538 Insufficient RPM change during KOER Dynamic Response Test.
542 Fuel pump circuit open, EEC processor to motor ground.
543 Fuel pump circuit open, battery to EEC processor.
556 Fuel pump circuit failure.
558 Electronic Vacuum regulator circuit failure.
563 High speed Electro Drive Fan circuit failure.
564 Electro Drive Fan circuit failure.
565 Canister purge (CANP) circuit failure.
621 Shift solenoid #1 circuit failure.
622 Shift solenoid #2 circuit failure.
624 EPC solenoid or driver failure.
625 EPC solenoid driver open in EEC processor.
628 Lock-up solenoid circuit failure, excessive clutch slippage.
629 Lock-up solenoid circuit failure.
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.
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.
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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