Trouble Code Identification Charts

MR2 CODE IDENTIFICATION

Code No.

System Affected

Probable Cause

12 & 13

RPM Signal

Distributor Or Ckt, Starter Ckt, ECU

Ignition Signal

Distributor Or Ckt To ECU, ECU

O2 Sensor Signal

O2 Sensor Or Ckt, ⁽¹⁾ O2 Sensor Heater, ECU

Coolant Temp. Sensor Signal

Coolant Temp. Sensor Or Ckt, ECU

24 ⁽²⁾

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, ⁽³⁾ Airflow Meter/Vacuum Sensor, ECU

Rich Air/Fuel Mixture

Loose Ground, Injector Or Ckt, O2 Sensor Or Ckt, Fuel Pressure, ⁽³⁾ Airflow Meter/Vacuum Sensor, Cold Start Injector Or Ckt, Coolant Temp. Sensor, Compression Pressure, ECU

27 ⁽⁴⁾

Sub-O2 Sensor Signal

Sub-O2 Sensor Or Ckt, ECU

31 (2.2L)

⁽³⁾ Vacuum Sensor Signal

Vacuum Sensor Or Ckt, ECU

31(2.0L)

⁽³⁾ Airflow Meter Signal

Airflow Meter Or Ckt, ECU

32 ⁽¹⁾

Airflow Meter Signal

Airflow Meter Or Ckt, ⁽¹⁾⁽⁵⁾ECU

34 & 35

Turbocharger Pressure Sensor

Turbocharger Pressure Sensor Or Ckt, ECU

41 ⁽²⁾

TP Sensor Signal

Throttle Position Sensor Or Ckt, ECU

42 ⁽⁵⁾

VSS Signal

Vehicle Speed Sensor Or Ckt, ECU

43 ⁽⁵⁾

Starter Signal

Starter Signal Ckt, Ignition Switch Or Ckt, ECU

Switch Condition Signal

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

52 ⁽⁵⁾

Knock Sensor Signal

Knock Sensor Or Ckt, ECU

53 ⁽¹⁾

Knock Sensor Ctrl (ECU)

ECU

71 ⁽⁶⁾

EGR Sys Malfunction

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

⁽¹⁾	Used only on 3S-GTE.

⁽²⁾	CHECK ENGINE light comes on only for Calif. models.

⁽³⁾	Airflow meter used on 3S-GTE. Vacuum Sensor used on 5S-FE.

⁽⁴⁾	Used only on 5S-FE Calif. models.

⁽⁵⁾	CHECK ENGINE light will not come on when code is set.

⁽⁶⁾	Used only on Calif. models.