DTC 55

DIAGNOSIS:
- The recirculation gas temperature sensor is not in function.
- The harness connector between ECM and recirculation gas temperature sensor is in short or open.




1. CHECK INPUT SIGNAL FOR ECM.
1. Turn ignition switch to ON.
2. Measure signal voltage between ECM and body.

Connector & terminal / Specified voltage:
(E31) No.4 - Body / 4 - 4.8 V at 20 °C (68 °F)
(E31) No.4 - Body / 0.4 - 1.2 V at 100 °C (212 °F)

2. CHECK HARNESS CONNECTOR BETWEEN ECM AND RECIRCULATION GAS TEMPERATURE SENSOR.




1. Turn ignition switch to OFF.
2. Disconnect connector from recirculation gas temperature sensor.
3. Measure resistance of harness connector between ECM and recirculation gas temperature sensor.

Connector & terminal / Specified resistance:
(E31) No.4 - (E15) No.1 / 10 Ohm, max.




4. Measure resistance of harness connector between ECM and body to make sure that circuit does not short.

Connector & terminal / Specified resistance:
(E31) No.4 - Body / 1 MOhm, max.