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• Code meanings can vary with vehicle, model year, engine type and options.
• If a code number has more than one definition listed, note that only one definition
applies to your vehicle. Consult service manual to get the specific definition for
your vehicle.
• Each code definition includes a list of possible causes for the code.
• Follow vehicle service manual procedures to find the cause of the code.
1) Visual inspections are important!
2) Problems with wiring and connectors are common, especially for intermittent faults.
3) Mechanical problems (vacuum leaks, binding or sticking linkages, etc.) can make a
good sensor send an incorrect signal to the computer. This can cause a Trouble
Code.
4) Incorrect information from a sensor may cause the computer to control the engine
in the wrong way. Faulty engine operation might even make the computer show a
different good sensor as being bad!
(Check Engine Light may be
ON or OFF.)
Bad power or ground
connection to Electronic
Control Unit (ECU). Faulty
ECU Fuse. Short circuit in
combination meter or Check
Engine light bulb wiring. Bad
ECU. Problems with
Manifold Absolute Pressure
(MAP) sensor, Throttle angle
(Position) sensor,
Atmospheric (PA) sensor,
Idle Mixture Adjuster sensor
or Exhaust Gas
Recirculation (EGR) valve lift
sensor. Faulty Automatic
Transmission (A/T) control
unit or Main relay. No signal
to ECU.
Oxygen (O
) sensor - Bad
2
Oxygen sensor or faulty
sensor wiring.
or ,
Pressure regulator - Bad
Pressure regulator, faulty
associated wiring or
improper fuel pressure.
or ,
Spark Plug mis-fire
40
Oxygen (O
) sensor - Bad
2
Oxygen sensor or faulty
sensor wiring.
or ,
Vehicle Speed Sensor
(VSS) - Bad Vehicle Speed
sensor, faulty sensor wiring,
Vacuum leaks or improper
Fuel pressure.
or ,
Electronic Control Unit
(ECU) - Bad ECU or faulty
ECU wiring.
Manifold Absolute
Pressure (MAP) sensor -
Bad MAP sensor or faulty
sensor wiring.
Top Dead Center/Crank/
Cylinder (TDC/CRANK/
CYL) sensors - Bad TDC/
CRANK/CYL sensor or
faulty sensor wiring.
or ,
TDC/Crank sensor - Bad
TDC/Crank sensor or faulty
sensor wiring
or ,
Crank Angle sensor - Bad
Crank Angle sensor or faulty
sensor wiring.
or ,
Pulse Generator assembly
- Bad Pulse Generator
assembly or faulty pulse
generator wiring.
or ,
Vacuum Switch - Bad
Vacuum switch or Manifold
Absolute Pressure (MAP)
sensor. Faulty switch/sensor
wiring or Vacuum lines.
or ,
Electronic Control Unit
(ECU) - Bad ECU or faulty
ECU wiring.
Manifold Absolute
Pressure (MAP) sensor -
Bad MAP sensor or
restriction in throttle body.
Faulty Vacuum hose or
sensor wiring.
Coolant Temperature (TW)
sensor - Bad Coolant
Temperature sensor. Faulty
Automatic Transmission (A/
T) control unit or sensor/
control unit wiring.
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