Diagnostic Trouble Codes - 1990
|12||Unable to control RPM to Self Test upper limit band.|
|13||Unable to control RPM to Self Test lower limit band.|
|14||PIP circuit failure.|
|19||Failure of EEC power supply.|
|21||ECT out of range.|
|22||MAP out of range.|
|23||TPS out of range.|
|29||Insufficient input from Vehicle Speed Sensor.|
|31||PFE circuit is below minimum.|
|32||EGR valve not seated.|
|33||EVP not closing properly.|
|34||No EGR flow.|
|35||PFE circuit is above maximum voltage.|
|39||AXOD converter bypass not applying correctly.|
|41||HEGO sensor circuit indicates system lean (Right HEGO).|
|42||HEGO sensor circuit indicates system rich (Right HEGO).|
|51||ECT sensor input too high.|
|52||Power steering pressure switch is open.|
|53||TPS input too high.|
|54||ACT (VAT) input too high.|
|57||AXOD Neutral Pressure Switch open.|
|59||Transhydraulic switch (THS 3/4) failed in open position.|
|61||ECT input too low.|
|63||TPS input too low.|
|64||ACT (VAT) input too low.|
|67||AXOD Neutral Pressure Switch closed.|
|68||AXOD Transmission Temperature Switch open.|
|69||Transhydraulic switch (THS 3/2) failed.|
|70||EEC-IV data transmission circuit failed.|
|71||Cluster Control Assembly circuit failed.|
|72||Message Center Control Assembly circuit failed.|
|74||Brake on/off circuit failed.|
|79||A/C on during Self Test.|
|83||High speed Electro Drive Fan circuit failure.|
|84||EGR Vacuum Regulator circuit failure.|
|85||Canister purge (CANP) circuit failure.|
|87||Fuel pump primary circuit fault.|
|88||Electro Drive Fan circuit failure.|
|89||AXOD Lock Up Solenoid circuit failure.|
|91||HEGO sensor circuit indicates system lean (Left HEGO).|
|92||HEGO sensor circuit indicates system Rich (Left HEGO).|
|95||Fuel pump secondary circuit failure.|
|96||Fuel pump secondary circuit failure.|
** On 1986 and later vehicles, this represents RPM too high/low or throttle pedal was depressed during KOER Self-Test
*** Low flow of unmetered air on 1987-88 1.9L EFI engine
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)
Analog Voltmeter Connection