Engine Temperature Sensor: Testing and Inspection

CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.7]

NOTE:
- Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. Description and Operation

Resistance Inspection

1. Disconnect the CHT sensor connector.

2. Measure the resistance between the CHT sensor terminals.

- If it is not within the specification, replace the CHT sensor.
- If the monitor item status/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
Measure the cylinder head temperature sensor resistance (approx.).





Cylinder head temperature sensor characteristics graph (reference)






Circuit Open/Short Inspection





1. Disconnect the PCM connector. Service and Repair

2. Inspect the following wiring harnesses for open or short. (Continuity inspection)

Open circuit

- If there is no continuity, the circuit is open. Repair or replace the wiring harness.

- CHT sensor terminal A and PCM terminal 2AL
- CHT sensor terminal B and PCM terminal 2AN

Short circuit

- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

- CHT sensor terminal A and power supply
- CHT sensor terminal A and body ground
- CHT sensor terminal B and power supply