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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.
Crank (Crankshaft) Angle
sensor - Bad or dirty Crank
Angle sensor, Electronic
Concentrated Control System
(ECCS) relay, Main Relay, EFI
Main Relay or Ignition switch.
Faulty sensor, relay or switch
wiring. Crank Angle sensor
harness is near spark plug
wires.
or ,
Crank Angle switch - Bad or
dirty Crank Angle switch or
faulty switch wiring.
Mass Airflow sensor - Bad
Mass Airflow sensor, Air Flow
Meter, Electronic Concentrated
Control System (ECCS) relay,
Main relay, Ignition switch or
Fuel Injector(s). Faulty wiring
associated with these parts.
NOTE: If vehicle is equipped
with Air Temperature sensor
and codes 41 and 12 are
present, check Air Temperature
sensor before MAF sensor.
or ,
Air Flow meter - Bad Air Flow
meter, Electronic Fuel Injection
(EFI) Main relay, Main relay,
Electronic Concentrated Control
System (ECCS) relay, Ignition
switch, Fuel Injector(s) or faulty
wiring associated with these
parts.
72
1) Visual inspections are important!
2) Problems with wiring and connectors
3) Mechanical problems (vacuum leaks,
4) Incorrect information from a sensor
Coolant Temperature sensor -
Bad Coolant Temperature sensor,
Engine Temperature sensor,
Cylinder Head Temperature
sensor, Water Temperature
sensor, or faulty sensor wiring.
or ,
Engine (Coolant) Temperature
sensor - Bad Engine
Temperature sensor or faulty
sensor wiring.
or ,
Water (Coolant) Temperature
Sensor - Bad Water
Temperature sensor or faulty
sensor wiring.
or ,
Cylinder Head Temperature
sensor - Bad Cylinder Head
Temperature sensor or faulty
sensor wiring.
Vehicle Speed Sensor (VSS) -
Bad Vehicle Speed Sensor
(VSS), Speedometer unit or
faulty sensor wiring.
No Ignition Reference (Pulse)
- Bad Ignition Coil, Power
Transistor, Power Transistor
relay, Ignition Coil relay, Ignition
switch, Resistor, Condenser, IC
Ignition unit, Detonation sensor
(if code 34 also) or faulty wiring
associated with these parts.
or ,
are common, especially for intermit-
tent faults.
binding or sticking linkages, etc.) can
make a good sensor send an incorrect
signal to the computer. This can cause
a Trouble Code.
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!
Ignition signal - Bad Spark
Plug(s), Ignition wires,
Distributor cap, distributor rotor,
power transistor, Power
Transistor relay, Ignition switch
or faulty wiring associated with
these parts.
or ,
Ignition System - Bad
Distributor, Ignition coil or IC
Ignition unit. Faulty Spark plug
wires or wiring associated with
these parts.
Fuel Pump - Bad Safety Relay,
Electronic Fuel Injection (EFI)
Safety relay, Fuel Pump, Fuel
Pump relay, Ignition switch,
Crank Angle sensor or faulty
wiring associated with these
parts.
or ,
Idle Speed Control (ISC)
valve - Bad ISC valve or faulty
valve wiring.
Idle switch - Bad or out of
adjustment Idle switch, Ignition
switch, Electronic Fuel Injection
(EFI) relay, Electronic
Concentrated Control System
(ECCS) relay, Main relay or
faulty switch/relay wiring.
or ,
Throttle Valve switch - Bad or
out of adjustment Idle switch,
Throttle Valve switch, Ignition
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