| 93 5.7L VIN 7 TBI |
| Trouble code |
Fault location |
Probable cause |
| 00 *(see below for additional information) |
No fault found |
– |
| 11 |
Malfunction indicator lamp (MIL) – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, MIL bulb, supply wire, ECM |
| 12 |
Start of diagnosis |
No RPM signal received |
| 13 |
Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds. |
Wiring open circuit, O2S, ECM |
| 14 |
Coolant temperature sensor signal indicates a temperature of over 275°
F for 2 seconds. |
Wiring short circuit to ground, ECT sensor, ECM |
| 15 |
Coolant temperature sensor signal indicates a temperature colder than
-27° F for 30 seconds after the engine has been running for at least 30
seconds. |
Wiring open circuit, ECT sensor, ECM |
| 16 |
Ignition system – low resolution pulse |
Wiring open circuit/short circuit to ground/short circuit to positive, distributor, ECM |
| 18 |
Injector(s) – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, supply wire, injectors, ECM |
| 21 |
TPS sensor voltage was above 2.5 volts for 8 seconds when the MAP sensor
signal showed manifold vacuum to be 15 pounds or more. |
Wiring open circuit/short circuit to positive, TP sensor, TP sensor interface module, ECM |
| 22 |
TPS voltage was under 0.2 volts when the engine was running. |
Wiring open circuit/short circuit to ground, TP sensor, TP sensor interface module, ECM |
| 23 |
Inlet air temperature sensor signal showed an air temperature below -22°
F after the engine has been running for 5 minutes. On Fleetwood the inlet
air temperature signal shows a temperature below -20° F for 5 seconds at
a speed less than 44 MPH. |
Wiring open circuit, IAT sensor, ECM |
| 24 |
When engine speed was between 1200 and 4400 RPM and throttle position
angle was less than 3%, the MAP signal showed low voltage (high manifold
vacuum) for at least 5 seconds. |
Wiring open circuit/short circuit to ground, VSS, VSS buffer module, park neutral position circuit, ECM |
| 25 |
Inlet air temperature sensor signal showed an air temperature over 302°
F after the engine has been running for 5 minutes. On Fleetwood the inlet
air temperature signal shows a temperature above 297° F for 5 seconds at
a speed less than 44 MPH. |
Wiring short circuit to ground, IAT sensor, ECM |
| 26 |
Quad-Driver sense voltage shows a low voltage for 5 seconds where battery
voltage should be present, or the sense voltage shows battery voltage for
25 seconds when a low voltage should be present. (Fleetwood only) |
Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM **(see below for additional information) |
| 27 |
Exhaust gas recirculation (EGR) vacuum control – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, EGR valve, ECM |
| 28 |
Transmission range (TR) pressure switch |
Wiring open circuit/short circuit to ground, ECM |
| 29 |
Secondary air injection (AIR) system |
Wiring open circuit/short circuit to ground/short circuit to positive, AIR valve relay, ECM |
| 32 |
EGR open command did not change MAP sensor signal. Normal EGR flow should
cause slight decrease in manifold vacuum which would change MAP sensor signal. |
Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM, hoses blocked/leaking, exhaust system blocked |
| 33 |
MAP sensor signal voltage was too high (low vacuum) for 5 seconds when
throttle opening was under 4%. |
Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM |
| 34 |
MAP sensor signal voltage was too low (high vacuum) when engine speed
was over 1200 RPM. On Fleetwood the engine speed was over 1000 RPM with
a throttle position angle above 21%. |
Wiring open circuit/short circuit to ground, MAP sensor, ECM |
| 36 |
Ignition system high resolution or extra low resolution pulse – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, distributor, ECM |
| 37 |
Brake switch stuck ON |
Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM |
| 38 |
Brake switch stuck OFF |
Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM |
| 41 |
The EST signal was present when the circuit should have been grounded
by the ignition module when it received bypass voltage under 1 volt. (Fleetwood
only) |
Wiring open circuit, DI control module, ECM |
| 42 |
The EST signal did not change when the ECM applied bypass voltage to the
ignition module. |
Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM |
| 43 |
The ECM did not detect a knock signal during near wide open throttle operation
with coolant temperature above 194° F or the knock signal was present for
4 seconds or more during normal engine operation. |
Wiring open circuit/short circuit to ground/short circuit to positive, KS, insecure PROM, ECM |
| 44 |
Oxygen sensor voltage was under 0.25 volts for 50 seconds of closed loop
operation. On Fleetwood the engine speed was over 1000 RPM with a throttle
position angle above 21%. |
Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, MAP sensor, O2S, ECM |
| 45 |
Oxygen sensor voltage was over 0.75 volts for 30 seconds with a throttle
angle greater than 20%. On Fleetwood the oxygen sensor voltage was 0.75
volts for 30 seconds in a closed loop with a throttle angle either greater
than 20% or less than 2%. |
Wiring open circuit, fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, MAP sensor, ECM |
| 46 |
Anti-Theft Pass Key signal was wrong when ignition was turned to start
position. |
Incorrect ignition key, wiring open circuit/short circuit to ground/ short circuit to positive, immobilizer control module, ECM |
| 47 |
Knock sensor (KS) – circuit malfunction |
Insecure PROM, ECM |
| 48 |
Mass air flow (MAF) sensor – circuit malfunction |
Wiring open circuit/short circuit to ground/ short circuit to positive, MAF sensor, ECM |
| 50 |
System voltage low |
Wiring open circuit/short circuit to ground, alternator, ECM |
| 51 |
PROM error. |
Insecure PROM, incorrect PROM, ECM |
| 53 |
System voltage high |
Alternator, ECM |
| 54 |
Fuel pump voltage was not present at fuel pump sense line for 2 seconds
after the ECM has sent the fuel pump on command. |
Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch, fuel pump, ECM |
| 55 |
Engine control module (ECM), fuel lean monitor |
Fuel filter/lines blocked, fuel pump |
| 58 |
Transmission fluid temperature (TFT) sensor – high temperature indicated |
Wiring short circuit to ground |
| 59 |
Transmission fluid temperature (TFT) sensor – low temperature indicated |
Wiring open circuit, TFT sensor, ECM/td> |
| 63 |
Heated oxygen sensor (H2OS) bank 2 – open circuit |
Wiring short circuit to ground/short circuit to ground/short circuit to positive, HO2S, ECM |
| 64 |
Heated oxygen sensor (HO2S) bank 2 – mixture lean |
Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, secondary air system, ECM |
| 65 |
Heated oxygen sensor (HO2S) bank 2 – mixture rich |
Fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, EGR system, HO2S contamination, MAF sensor, ECM |
| 66 |
A/C refrigerant pressure sensor circuit – open or short circuit |
Wiring open circuit/short circuit to ground/short circuit positive, A/C refrigerant pressure sensor, ECM |
| 67 |
A/C refrigerant pressure sensor circuit – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor |
| 68 |
A/C compressor clutch relay – circuit malfunction |
Wiring short circuit to ground/short circuit to positive, A/C compressor clutch relay |
| 69 |
A/C compressor clutch – circuit malfunction |
Wiring open circuit, A/C compressor clutch relay, ECM |
| 70 |
A/C compressor clutch relay – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, A/C compressor clutch relay, ECM |
| 72 |
Vehicle speed sensor (VSS) – circuit malfunction |
Wiring open circuit, VSS, ECM |
| 73 |
Pressure control solenoid – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, ECM |
| 74 |
Traction control system (TCS), circuit malfunction |
Wiring short circuit to ground, ABS control module trouble code(s) stored, ECM |
| 75 |
Transmission system – voltage low |
Supply wire, alternator, ECM |
| 77 |
Engine coolant blower motor relay 1 – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower motor relay, ECM |
| 78 |
Engine coolant blower motor relay 2 – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower relay, ECM |
| 79 |
Transmission fluid – overtemp |
Wiring open circuit/short circuit to ground, TFT sensor, ECM |
| 81 |
Transmission shift solenoid (SS), 2nd-3rd – circuit malfunction |
Wiring open circuit/short circuit to ground, SS, ECM |
| 82 |
Transmission shift solenoid (SS), 1st-2nd – circuit malfunction |
Wiring open circuit/short circuit to ground, SS, ECM |
| 83 |
Torque converter clutch (TCC) solenoid, pulse width modulated – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, TCC solenoid, ECM |
| 84 |
Transmission shift solenoid (SS), 3rd-2nd – circuit malfunction |
Wiring open circuit/short circuit to ground, SS, ECM |
| 85 |
Torque converter clutch (TCC) – stuck ON |
Wiring open circuit/short circuit to ground, transmission mechanical fault, TCC solenoid |
| 90 |
Transmission TCC solenoid – circuit malfunction |
Wiring open circuit/short circuit to ground, TCC solenoid, ECM |
| 95 |
Change oil lamp – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil life lamp bulb, ECM |
| 96 |
Engine oil level warning lamp – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensro, ECM |
| 97 |
Vehicle speed sensor (VSS) – circuit malfunction |
Wiring open circuit/short circuit to ground/short circuit to positive, VSS, ECM |
