Contents

			Test results
1	COMPONENT CONCERNED	ELECTRICAL CONNECTIONS CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Connections on oxygen sensor and Powertrain Control Module	Check for loose electrical connections at the sensor connector 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 UPSTREAM OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between upstream oxygen sensor and Powertrain Control Module	Check for continuity breaks on the wiring between oxygen sensor and pin 35 of the Powertrain Control Module due to oxidised or corroded terminals	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	COMPONENT CONCERNED	UPSTREAM OXYGEN SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Upstream oxygen sensor	Check that the oxygen sensor is working correctly See Test 1080BA Check on the operation of the upstream Lambda sensor	End of diagnosis	Oxygen sensor not working properly.	Replace the upstream oxygen sensor Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R