| 92-93 4.9L VIN B |
|---|
| Trouble code | Fault location | Probable cause |
| 12 | PCM did not receive distributor reference pulses for 4 seconds. | Wiring open circuit/short circuit to ground/short circuit to positive, HEI module, HEI pick up coil, ECM |
| 13 | Oxygen sensor voltage stays between 0.307 and 0.609 volts for 64 seconds.
Engine was at normal operating temperature at a speed over 800 RPM. | Wiring open circuit/short circuit to ground/short circuit to positive, O2S, ECM |
| 14 | Coolant temperature sensor signal indicates a temperature of over 313°
F. | Wiring short circuit to ground, ECT sensor, ECM |
| 15 | Coolant temperature sensor signal indicates a temperature colder than
-27° F. | Wiring open circuit, ECT sensor, ECM |
| 16 | Ignition voltage was either less than 10 volts or greater than 16 volts
for 5 seconds. | Wiring, alternator, ECM |
| 17 (Eldorado & Seville) | Oxygen sensor voltage stays between 0.307 and 0.609 volts for 64 seconds.
Engine was at normal operating temperature and over 800 RPM. | Wiring open circuit/short circuit to ground/short circuit to positive, O2S, ECM |
| 19 | Fuel pump feedback voltage stayed above 7 volts for 4 seconds after ignition
was turned on. | Wiring short circuit to positive, fuel pump relay, engine oil pressure switch, ECM |
| 20 | Fuel pump feedback voltage was 2 volts or less for 1 second. | Wiring open circuit/short circuit to ground/short circuit to positive, fuel pump relay, fuel pump, engine oil pressure switch, ECM |
| 21 | TPS value was 72 degrees or more for 0.7 seconds. | Wiring open circuit/short circuit to positive, TP sensor, ECM |
| 22 | TPS value was 1.3 degrees or less for 0.7 seconds when the engine was
running at 600 RPM or more. | Wiring open circuit/short circuit to ground, TP sensor, ECM |
| 23 | EST signal did not change when the ECM applied bypass voltage to the ignition
module. | Wiring open circuit/short circuit to ground, HEI pick up coil, ICM, ECM |
| 24 | Vehicle speed was 0 for 3 seconds with transmission in drive or reverse
and brake off when throttle angle was at least 17 degrees and engine RPM
was 1400 or greater. | Wiring open circuit/short circuit to ground, VSS, ECM |
| 26 | Throttle switch input to the PCM was closed for 1.8 seconds while the
TPS was between 20 and 75 degrees. | Wiring open circuit/short circuit to ground, TPS, ECM |
| 27 | Throttle switch was open when vehicle was coasting down with brake applied.
Throttle angle was 16.5 degrees or less but RPM was greater than desired. | Wiring open circuit, ISC actuator, ECM |
| 30 | TPS was 14 degrees or more while ISC was retracting for 15 seconds, or
TPS was 2 degrees while ISC was extending for 15 seconds. | Wiring short to ground, misfire, throttle valve tight/sticking, intake system leaking, TPS, ISC actuator, ECM |
| 31 | MAP sensor was shorted to 5 volts for 0.2 seconds. | Wiring open circuit/short circuit to positive, ECM |
| 32 | MAP sensor was open showing a reading of 0.5 volts or less for 0.2 seconds. | Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 34 | MAP sensor signal voltage was too high (low vacuum) for 15 seconds when
throttle switch was closed. | Wiring open circuit/short circuit to positive, MAP sensor, ECM |
| 37 | MAT sensor was shorted showing a temperature of 313° F or more. | Wiring short circuit to ground/short circuit to positive, IAT sensor, ECM |
| 38 | MAT sensor was open showing a temperature of -27° F or less. | Wiring open circuit, IAT sensor, ECM |
| 39 | Engine RPM was outside of the range expected for indicated vehicle speed
indicating a VCC engagement problem. | Wiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM |
| 40 | Power steering switch was open when vehicle was at a speed of 45 MPH or
greater. | Wiring open circuit/short circuit to ground/short circuit to positive, PSP switch, ECM |
| 41 | CAM reference pulses were not received when distributor reference pulses
were received at an engine speed of 1600 RPM or less. | Wiring open circuit/short circuit to ground, CMP sensor, ECM |
| 42 | Left oxygen sensor was lean for more than 50 seconds when engine was warm
and at 800 RPM or greater. (Eldorado & Seville only) | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM |
| 43 | Left oxygen sensor was rich for more than 50 seconds when engine was warm
and at 800 RPM or greater. (Eldorado & Seville only) | Wiring open circuit/short circuit to positive, fuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge, MAP sensor hoses, O2S, ECM |
| 44 | Right oxygen sensor was lean for more than 50 seconds when engine was
warm and at 800 RPM or greater. | Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM |
| 45 | Right oxygen sensor was rich for more than 50 seconds when engine was
warm and at 800 RPM or greater. | Wiring open circuit/short circuit to positive, fuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge valve, MAP sensor hoses, O2S, ECM |
| 46 | Left and right fuel control block learn values differ by more than 15
counts for 10 minutes. (Eldorado & Seville only) | Injector(s) leaking, HO2S, intake/exhaust system leaking, spark plug(s), ignition system |
| 47 | PCM has received bad data from IPC for 3 seconds while engine speed was
500 RPM or more for 3 seconds. | Wiring, BCM |
| 48 | EGR open command was given during off idle operation. EGR opening should
cause the mixture to be slightly richer because of the low oxygen content
of exhaust gas. Vehicle speed was over 35 MPH and engine was warm. | Wiring open circuit/short circuit to ground, supply wire, vacuum hoses, EGR solenoid, ECM |
| 51 (Eldorado & Seville) | MEM-CAL error. | Insecure PROM, incorrect PROM, ECM |
| 52 | PCM has lost primary battery power. | Battery disconnected, ECM disconnected |
| 53 | Distributor reference pulses were not received for 0.4 seconds when engine
speed was greater than 568 RPM. | Wiring open circuit/short circuit to positive, HEI module pick up coil |
| 55 | TPS zero point was out of range. | Throttle valve tight/sticking, ISC actuator, TP sensor, TP sensor incorrectly adjusted |
| 58 | Pass Key fuel enable was not correct. | Incorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM |
| 60 | Transmission was not in drive when cruise control was engaged. | Driver error, wiring open circuit/short circuit to ground, PNP switch |
| 61 | Cruise vent solenoid commanded OFF but solenoid remained ON, or commanded
ON but solenoid remained OFF. | Wiring open circuit/short circuit to ground/short circuit to positive, cruise control servo, ECM |
| 62 | Cruise vacuum solenoid commanded OFF but solenoid remained ON, or commanded
ON but solenoid remained OFF. | Wiring open circuit/short circuit to positive, cruise control servo, ECM |
| 63 | Cruise control servo position was at least 39% with cruise engaged. Vehicle
speed was 20 MPH higher than the set speed for 0.5 seconds. | Wiring short circuit to positive, hoses leaking, cruise control servo, throttle binding |
| 64 | Vehicle speed increased more than 16 MPH in 1 second while cruise control
was engaged. | Slippery road conditions |
| 65 | Cruise control servo position was 6.3% or less for 1 second. | Wiring open circuit/short circuit to ground, cruise control servo |
| 66 | Engine RPM was 4800 or more for 0.25 seconds with cruise control engaged. | Slippery road conditions, transmission mechanical fault |
| 67 | Cruise control Set/Coast or Resume/Accel switch was closed for 10 minutes. | Wiring short circuit to ground/short circuit to positive, supply wire, cruise control switch, ECM |
| 68 | With cruise control engaged the throttle angle was greater than 20 degrees
and servo position sensor indicated a stroke greater than commanded. | Wiring short to positive, hoses blocked/leaking, brake pedal vacuum valve, cruise control servo, throttle binding |
| 70 | Throttle position changed too rapidly without a corresponding change in
MAP sensor signal when engine was running. | Wiring open circuit/short circuit to ground/short circuit to positive, TP sensor, throttle binding |
| 71 | MAP sensor signal changed too rapidly while TPS signal was steady and
engine speed did not change. | Wiring open circuit/short circuit to ground/short circuit to positive, MAP sensor |
| 73 | Coolant temperature sensor voltage has changed 0.3 volts in 1 second. | Wiring open circuit/short circuit to ground/short circuit to positive, ECT sensor |
| 74 | MAT sensor signal changed 7 degrees or more in 0.25 seconds. | Wiring open circuit/short circuit to ground/short circuit to positive, IAT sensor |
| 75 | Vehicle speed changed by 8 MPH or more in 1 second while MAP sensor remained
steady with engine running and brakes not applied. | Wiring open circuit/short circuit to ground/short circuit to positive, VSS |
| 80 | Block learn was 104 or less for 25 seconds with a throttle angle between
6 and 30 degrees and engine was warm. | Fuel pressure high, injector(s) leaking, EVAP system |
| 85 | The coast down throttle angle offset is more than 5 degrees from the zero
value. | Throttle valve tight/sticking, TP sensor, ISC actuator |
| 90 | Vehicle speed cycles from 30 MPH to 0 at least 10 consecutive times with
no VCC brake switch input. | Wiring open circuit/short circuit to positive, incorrectly adjusted BPP switch, BPP switch, ECM |
| 91 | Gear selector switch has either an open or a short causing an invalid
signal for a forward or reverse gear. | Wiring open circuit/short circuit to ground, incorrectly adjusted PNP switch, PNP switch, ECM |
| 92 | Heated window signal was present at PCM for 10 minutes or more. | Wiring open circuit/short circuit to ground/short circuit to positive, console switch, windshield control module |
| 96 | Throttle angle was 65 degrees or more for 12 seconds with transmission
in drive or reverse and vehicle speed was 5 MPH or less with brake being
applied. | ECM trouble codes stored, driver error |
| 97 | Gear selector was moved from park or neutral to drive or reverse with
engine speed over 2000 RPM but under 6 MPH. | Driver error, wiring, transmission range (TR) switch |
| 98 | At a vehicle speed under 6 MPH, the gear selector was moved from park
or neutral into drive or reverse when engine speed was 600 RPM greater than
determined by PCM. | Driver error, wiring, transmission range (TR) switch |
| 99 | Servo position sensor indicated that servo was still engaged after cruise
control had been disengaged for 2 seconds. Throttle angle was above 20 degrees. | Wiring short to positive, throttle valve tight/sticking, hoses blocked/leaking, cruise control servo |
