Inspection Procedure

DTC 22 Engine Coolant Temp. Sensor Circuit

INSPECTION PROCEDURE
HINT: If diagnostic trouble codes "22" (engine coolant temperature sensor circuit), "24" (intake air temperature sensor circuit), "31" (manifold absolute pressure sensor circuit) and "41" (throttle position sensor circuit) are output simultaneously, E2 (sensor ground) may be open.

1. Check voltage between terminals THW and E2 of engine control module connector.
a. Turn up the floor mat on the passenger side.
b. Turn ignition switch on.



c. Measure voltage between terminals THW and E2 of engine control module connector.

Coolant temp. | Voltage
20°C (68°F) | 0.5 - 3.4 V.
80°C (176°F) | 0.2 - 1.0 V.

- If OK check for momentary interruption.
- If not OK proceed to step 2.

2. Check engine coolant temperature sensor.
a. Disconnect the engine coolant temperature sensor connector.



b. Measure resistance between terminals.

Resistance / Temperature Table:

Temperature / Resistance / Voltage Chart:

OK if resistance is within range shown on chart.

- If OK proceed to step 3.
- If not OK replace engine coolant temperature sensor.

3. Check for open and short in harness and connector between engine control module and engine coolant temperature sensor.

- If OK check and replace engine control module.
- If not OK repair or replace harness or connector.