DTC 55

DIAGNOSTIC CHART

Diagnostic Chart:

Diagnosis
Recirculation gas temperature sensor does not function.
Shift cable is not properly connected.
Harness connector between ECM and sensor is shorted or open.

CHECK INPUT SIGNAL FOR ECM

Input Signal:

1. Turn ignition ON.
2. Measure signal voltage between ECM and body.

Connector & Terminal Voltage
(E31) 4 - body 4.0 - 4.8 V @ 68°F (20°C)
(E31) 4 - body 0.4 - 1.2 V @ 212°F (100°C)


CHECK HARNESS CONNECTOR BETWEEN ECM AND RECIRCULATION GAS TEMPERATURE SENSOR

Harness Test:

1. Turn ignition OFF.
2. Unplug connector from sensor.
3. Measure resistance of harness connector between ECM and sensor.

Connector & Terminal Resistance
(E31) 4 - (E15) 1 10 ohms max.

Harness Test:

4. Measure harness connector resistance between ECM and body to ensure no short circuit.

Connector & Terminal Resistance
(E31) 4 - body 1 M ohms min.