| Code |
System |
Diagnosis |
Trouble area |
| 11 |
ECU (+B) |
Momentary interruption in power to ECU |
Wiring loom, ECU |
| 12 |
RPM signal |
No NE or G signal to ECU within 2 seconds after
engine has been cranked |
Distributor (circuit), starter signal circuit, ECU |
| 13 |
RPM signal |
No NE signal to ECU when engine speed is above
1,000 rpm |
Distributor (ignition coil), ECU |
| 14 |
Ignition signal |
No IGF signal to ECU 8-11 times in succession |
Igniter and ignition coil (circuit), ECU |
| 21 |
Oxygen sensor/
Heater circuit |
Detection of oxygen sensor deterioration/Open
or short in oxygen sensor heater |
Oxygen sensor (heater) (circuit), ECU |
| 22 |
Water temp. sensor
signal |
Open or short in water temp. sensor circuit for 0.5
sec. or more (THW) |
Water temp. sensor (circuit), ECU |
| 24 |
Intake air temp.
sensor signal |
Open or short in intake air temp. sensor circuit
for 0.5 sec. or more (THA) |
Intake air temp. sensor (circuit), ECU |
| 25 |
Air-fuel ratio lean malfunction |
Oxygen sensor outputs a lean signal continuously
for several seconds during air-fuel ratio correction. Open or short in oxygen sensor (OX) |
Injector (circuit), Oxygen sensor circuit, ECU, fuel line pressure, airflow meter, air intake system, ignition system |
| 26 |
Air-fuel ratio rich malfunction |
Oxygen sensor outputs a rich signal continuously
for several seconds during air-fuel ratio correction |
Injector (circuit), fuel line pressure, cold start injector, airflow meter, ECU |
| 31 |
Airflow meter signal |
Open circuit in VC signal or short circuit between
VS and E2 when idle contacts are closed |
airflow meter (circuit), ECU |
| 32 |
Airflow meter signal |
Open circuit in E2 or short circuit between VC and
VS |
airflow meter (circuit), ECU |
| 34 |
Turbocharging
pressure signal |
Excessive turbocharging pressure (fuel cut) |
Turbocharger, turbocharging pressure sensor (circuit), ECU |
| 35 |
Turbocharging
pressure sensor signal |
Open or short circuit in turbocharging sensor
pressure signal (PIM) |
Turbocharging pressure sensor (circuit), ECU |
| 41 |
Throttle position
sensor signal |
Open or short circuit in throttle position sensor
signal (VTA) |
Throttle position sensor (circuit), ECU |
| 42 |
Vehicle speed sensor
signal |
No SPD signal for 8 seconds when engine speed
is between 2,500 rpm and 5,000 rpm and coolant temperature is below 80 °C (176 °F) except when
racing the engine |
Vehicle speed sensor (circuit), ECU |
| 43 |
Starter signal |
No STA signal to ECU until engine speed reaches 800rpm with vehicle not moving |
Ignition switch (circuit) |
| 51 |
Switch condition signal |
No IDL signal or A/C signal to ECU, with the check terminals TE1 and E1 connected |
A/C switch circuit, A/C amplifier, accelerator pedal and cable, see 41 |
| 52 |
Knock sensor signal |
Open or short circuit in knock sensor signal (KNK) |
Knock sensor (circuit), ECU |
| 53 |
Knock control
signal in ECU |
Knock control in ECU faulty |
ECU |
| 54 |
Intercooler ECU signal |
Intercooler coolant level low or pump problem |
Intercooler (pump) |
| 71 |
EGR malfunction |
EGR gas temp. below predetermined level for
during EGR control |
EGR system, EGR gas temp. sensor
(circuit), EGR control VSV (circuit), ECU |
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