| 94 5.7L VIN P |
|---|
| Flash code | Fault location | Probable cause |
| 11 | Malfunction indicator lamp circuit voltage was wrong for 26 seconds. | Wiring open circuit/short circuit to ground, MIL, supply wire, ECM |
| 13 | Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds.
Engine was at normal operating temperature and had been running for
at least 2 minutes after start with a throttle angle above 5%. | Wiring open circuit, O2S/H2OS, ECM |
| 14 | Coolant temperature sensor signal indicates a temperature of over
284° F. | Wiring short circuit to ground, ECT sensor, ECM |
| 15 | Coolant temperature sensor signal indicates a temperature colder than
-56° F. | Wiring open circuit, ECT sensor, ECM |
| 16 | A low resolution pulse was not detected by ECM within 720 high resolution
timing pulses. | Wiring open circuit/short circuit to ground/short circuit to positive, distributor, ECM |
| 18 | Injector driver circuit voltage to PCM was wrong for 4 seconds. | Wiring open circuit/short circuit to ground, supply wire, injectors, ECM |
| 21 | TPS voltage was above 2.5 volts for 3 seconds when the engine was
running, or when the TPS was above 4.8 volts at any time. | Wiring open circuit/short circuit to positive, TP sensor, ECM |
| 22 | TPS voltage was under 0.23 volts when the engine was running. | Wiring open circuit/short circuit to ground, TP sensor, ECM |
| 23 | Inlet air temperature sensor signal showed an air temperature below
-31° F for 60 seconds after the engine has been running for 4 minutes. | Wiring open circuit, IAT sensor, ECM |
| 24 | Vehicle speed was 0 MPH when engine speed was between 900 and 3000
RPM and throttle position angle was less than 2% for 5 seconds. | Wiring open circuit/short circuit, PROM, VSS, ECM |
| 25 | Inlet air temperature sensor signal showed an air temperature over
302° F for 12 seconds after the engine has been running for 4 minutes. | Wiring short circuit to ground, IAT sensor, ECM |
| 26 | ECM detected the wrong potential voltage at the #1 quad-driver module
circuit for 20 seconds. |
| 27 | ECM detected the wrong potential voltage at the #2 quad-driver module
circuit for 3 seconds. |
| 28 | ECM detected the wrong potential voltage at the #3 quad-driver module
circuit for 3 seconds. |
| 29 | Secondary air injection pump circuit voltage was wrong for 26 seconds. | Wiring open circuit/short circuit to ground/short circuit to positive, AIR valve relay, ECM |
| 32 | EGR open command did not change the fuel mixture when the command
was given during off idle operation. EGR opening should cause the mixture
to be slightly richer because of the low oxygen content of the exhaust
gas. | Wiring open circuit/short circuit to ground, exhaust system blocked, EGR valve, ECM |
| 33 | MAP sensor signal voltage was too high (low vacuum) for 1 second when
throttle opening was under 20% and engine speed was above 1250 RPM. | Wiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 | MAP sensor signal voltage was too low (high vacuum) when engine speed
was under 700 RPM, or when TPS was greater than 20% with an engine speed
above 700 RPM. | Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 36 | ECM detected less than 40 high resolution timing pulses between each
low resolution pulse for 5 consecutive cycles. | Wiring open/short circuit to ground/short circuit to positive, distributor, ECM |
| 41 | EST circuit voltage was above 4.6 volts when engine speed was under
1500 RPM. |
| 42 | PCM did not detect any EST signal within 84 crankshaft revolutions. | Wiring open circuit/short circuit to ground, ICM, ECM |
| 43 | One or both of the knock sensors were either open or grounded for
5 seconds. | Wiring open circuit/short circuit to ground/short circuit to positive, KS, PROM, ECM |
| 44 | Left oxygen sensor voltage was under 0.2 volts for 50 seconds of closed
loop operation. | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, HO2S, ECM |
| 45 | Left oxygen sensor voltage was over 0.7 volts for 50 seconds when
the throttle angle was above 4% during closed loop operation. | Wiring open circuit, injector(s) leaking, fuel pressure high, HO2S contamination, EVAP canister purge valve, TP sensor, EGR system, HO2S, MAF sensor, ECM |
| 47 | Knock sensor signal was not present. | Insecure PROM, ECM |
| 48 | There was no MAF signal when engine was on. | Wiring open circuit/short circuit to ground/short circuit to positive, MAF sensor, ECM |
| 50 | PCM detected an ignition voltage of less than 8.0 volts. | Wiring open circuit/short circuit to ground, alternator, ECM |
| 51 | PROM error. | Insecure PROM, incorrect PROM, ECM |
| 52 | Engine oil temperature was below -31° F after engine had been running
for 30 minutes. |
| 53 | ECM detected a battery voltage either above 17.1 volts. | Alternator, ECM |
| 55 | ECM detected a lean oxygen sensor voltage for 3 seconds during the
power enrichment modes of operation. | Fuel filter/lines blocked, fuel contamination |
| 62 | Engine oil temperature sensor indicated an oil temperature above 284°
F after engine had been running for 30 minutes. |
| 63 | Right oxygen sensor was open showing a steady voltage between 0.35
and 0.55 volts for 60 seconds after the engine had been running for
at least 2 minutes with a throttle angle above 5%. | Wiring open circuit/short circuit to ground/short circuit to positive, HO2S contamination, HO2S, ECM |
| 64 | Right oxygen sensor voltage was below 0.2 volts for 50 seconds of
closed loop operation. | Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, ECM |
| 65 | Right oxygen sensor voltage was above 0.7 volts for 50 seconds of
closed loop operation when the throttle angle was above 4%. | Fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, EGR system, HO2S contamination, MAF sensor, ECM |
| 66 | A/C pressure sensor circuit was either open or shorted showing a voltage
below 0.12 volts or above 4.86 volts for 10 seconds. | Wiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor, ECM |
| 67 | ECM did not detect an A/C system pressure change of more than 9 psi
when A/C clutch was engaged. | Wiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor, A/C compressor clutch |
| 68 | ECM detects voltage on the A/C status line for more than 20 seconds
after ECM has disengaged the A/C relay. | Wiring short circuit to ground/short circuit to positive, A/C compressor clutch relay, ECM |
| 69 | ECM did not detect any voltage on A/C status line for 20 seconds after
ECM had commanded A/C ON. | Wiring open circuit, A/C compressor clutch relay, ECM |
| 70 | A/C clutch relay circuit showed incorrect potential voltage at PCM
for 26 seconds. | Wiring open circuit/short circuit to ground/short to positive, A/C compressor clutch relay, ECM |
| 72 | Transmission output speed changed more than 1000 RPM for 2 seconds
when vehicle was in gear, or transmission output speed changed more
than 2048 RPM when vehicle was in park or neutral. | Wiring open circuit/short circuit to ground, VSS, ECM |
