Trouble Code Identification

WARNING: This page is about a different car, the 1993 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.

TROUBLE CODE IDENTIFICATION ⁽¹⁾⁽²⁾⁽³⁾

CODE No.

System Affected

NORMAL MODE

TEST MODE

Probable Cause:

RPM Signal

N/A

Distributor, Starter or Ckt, ECM

RPM Signal

Distributor or Ckt, ECM

Ignition Signal

N/A

Ignitor or Ckt to ECM, ECM

16 (2.2L)

Elect. Controlled A/T Signal

N/A

ECM or Ckt

21 (1.6L)

O2 Sensor Signal

N/A

O2 Sensor or Ckt, ECM

21 (2.0L)

O2 Sensor Signal

⁽⁴⁾

O2 Sensor or Ckt, ECM

21 (2.2L)

O2 Sensor Signal

N/A

O2 Sensor or Ckt, ECM

Coolant Temp. Sensor Signal

Coolant Temp. Sensor or Ckt, ECM

Intake Air Temp. Sensor Signal

ON ⁽⁵⁾

Intake Air Temp. Sensor or Ckt, ECM

Lean Air/Fuel Mixture

Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, CompressionPressure, ECM

26 ⁽⁶⁾

Rich Air/Fuel Mixture

Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, Cold Start Injector or Ckt, Compression Pressure, ECM

27 (2.2L)

Sub-O2 Sensor Signal ⁽⁷⁾

Sub-O2 Sensor or Ckt, ECM

31 (1.6L)

Vacuum Sensor Signal

Vacuum Sensor or Ckt, ECM

31 (2.0L)

Airflow Meter

Airflow Meter or Ckt, ECM

31 (2.2L)

Vacuum Sensor Signal

Vacuum Sensor or Ckt, ECM

32 (2.0L)

Airflow Meter

Airflow Meter or Ckt, ECM

34 (2.0L)

Turbocharging Pressure Sensor

N/A

Turbocharging Pressure Sensor or Ckt, ECM

35 (2.0L)

Turbocharging Pressure Sensor

Turbocharging Pressure Sensor or Ckt, ECM

41 (1.6L)

TPS Signal

ON ⁽⁵⁾

Throttle Position Sensor or Ckt, ECM

41 (2.0L)

TPS Signal

ON ⁽⁵⁾

Throttle Position Sensor or Ckt, ECM

41 (2.2L)

TPS Signal

ON ⁽⁵⁾

Throttle Position Sensor or Ckt, ECM

Vehicle Speed Sensor Signal

OFF

Vehicle Speed Sensor or Ckt, ECM

43 (1.6L)

Starter Signal

OFF

Starter Signal Ckt, Main Relay, Ignition Switch or Ckt, ECM

43 (2.0L)(2.2L)

Starter Signal

N/A

OFF

Starter Signal Ckt, Main Relay, Ignition Switch or Ckt, ECM

51 (1.6L)

Switch Condition Signal

OFF

A/C Switch, Park/Neutral Switch or Ckt, TPS or Ckt, ECM

51 (2.0L)(2.2L)

Switch Condition Signal

N/A

OFF

A/C Switch, Park/Neutral Switch or Ckt, TPS or Ckt, ECM

52 (2.0L)(2.2L)

Knock Sensor Signal

N/A

Knock Sensor or Ckt, ECM

53 (2.0L)

Knock Control Signal

N/A

ECM

71 ⁽⁷⁾

EGR System Malfunction

EGR System, EGR Temp. Sensor or Ckt, EGR-VSV, ECM

⁽¹⁾	The 1.6L is the 4A-FE engine, 2.0L is the Turbo 3S-GTE, and 2.2L is the 5S-FE engine.

⁽²⁾	Only Normal Mode is used on 1.6L (4A-FE). Both modes are used on all others. Information in Test Mode applies to all models except the 1.6L (4A-FE).

⁽³⁾	ON indicates MIL on instrument panel will be illuminated. N/A indicates item is not included in malfunction diagnosis when using this mode. OFF indicates MIL on instrument panel will be not be illuminated even if malfunction is detected.

⁽⁴⁾	The MIL will be illuminated if problem exists in O2 sensor circuit. The MIL will not be illuminated if problem exists in O2 sensor heater or circuit.

⁽⁵⁾	The MIL will be illuminated on California models only.

⁽⁶⁾	Applies to California models on 2.2L, or all models on 1.6L and 2.0L.

⁽⁷⁾	Applies to California models only.