Trouble Code Identification Charts

PICKUP & 4RUNNER CODE IDENTIFICATION

Code No.

System Affected

Probable Cause

12 & 13

RPM Signal

Distributor Or Ckt, Starter Ckt, ECU

Ignition Signal

Ignitor Or Ckt To ECU, ECU

O2 Sensor Signal

O2 Sensor Or Ckt, O2 Sensor Heater, ECU

Coolant Temp. Sensor Signal

Coolant Temp. Sensor Or Ckt, ECU

24 ⁽¹⁾

IAT Sensor Signal

Intake Air Temp. Sensor Or Ckt, ECU

Lean Air/Fuel Mixture

Loose Ground, Injector Or Ckt, O2 Sensor Or Ckt, Fuel Pressure, Ignition Sys, Coolant Temp. Sensor, Airflow Meter, ECU

Rich Air/Fuel Mixture

Loose Ground, Injector Or Ckt, O2 Sensor Or Ckt, Fuel Pressure, Cold Start Injector Or Ckt, Coolant Temp. Sensor, Airflow Meter, Compression Pressure, ECU

Airflow Meter Signal

Airflow Meter Or Ckt, ECU

Airflow Meter Signal

Airflow Meter Or Ckt, ECU

High Altitude Compensator

ECU

41 ⁽²⁾

TP Sensor Signal

Throttle Position Sensor Or Ckt, ECU

42 ⁽³⁾

VSS Signal

Vehicle Speed Sensor Or Ckt, ECU

43 ⁽³⁾

Starter Signal

Starter Signal Ckt, Ignition Switch Or Ckt, Main Relay, ECU

51 ⁽³⁾

Switch Condition Signal

A/C Switch Ckt, Neutral/Start Switch Or Ckt, TPS Or Ckt, ECU

Knock Sensor Signal

Knock Sensor Or Ckt, ECU

Knock Sensor Ctrl (ECU)

ECU

71 ⁽⁴⁾

EGR Sys Malfunction

EGR Sys, EGR Temp. Sensor Or Ckt, EGR-VSV, ECU

⁽¹⁾	CHECK ENGINE light comes on only for Calif. models.

⁽²⁾	CHECK ENGINE light comes on only for 22R-E Calif. models.

⁽³⁾	CHECK ENGINE light will not come on when code is set.

⁽⁴⁾	Used only on Calif. models.