Contents

			Test results
1	COMPONENT CONCERNED	ELECTRICAL CONNECTIONS CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Connections on water temperature sensor and Powertrain Control Module	Check for loose electrical connections at the water temperature sensor and at the Powertrain Control Module.	Go to Step 2	Presence of loose electrical connections.	Restore the correct connections.
2	COMPONENT CONCERNED	WIRING CONTINUITY CHECK BETWEEN WATER TEMPERATURE SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between water temperature sensor and Powertrain Control Module	Check for continuity breaks on the wiring between the water temperature sensor and pin 19 of the Powertrain Control Module	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	COMPONENT CONCERNED	WIRING INSULATION CHECK BETWEEN WATER TEMPERATURE SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between water temperature sensor and Powertrain Control Module	Check for a short circuit to the battery on the wiring between the water temperature sensor and pin 19 of the Powertrain Control Module	Go to Step 4	Presence of short circuits to battery on the wiring.	Restore the correct wiring insulation to battery.
4	COMPONENT CONCERNED	EARTH CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Water temperature sensor wiring	Check the condition of the earth connections.	Go to Step 5	Breaks in the wiring continuity.	Restore the correct earth connections.
5	COMPONENT CONCERNED	WATER TEMPERATURE SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Water temperature sensor	Check that the water temperature sensor is working properly See Test 1056BC Engine coolant temperature sensor operation check	End of diagnosis	Water temperature sensor not working properly	Replace the water temperature sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R