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 DOWNSTREAM OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between downstream oxygen sensor and Powertrain Control Module	Check for continuity breaks on the wiring between oxygen sensor and pin 47 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	WIRING INSULATION CHECK BETWEEN DOWNSTREAM OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between downstream oxygen sensor and Powertrain Control Module	Check for short circuits to earth on the wiring between oxygen sensor and pin 47 of the Powertrain Control Module	Go to Step 4	Presence of short circuits to earth on the wiring.	Restore the correct wiring insulation to earth.
4	COMPONENT CONCERNED	DOWNSTREAM OXYGEN SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Downstream oxygen sensor	Check that the downstream oxygen sensor is working properly See Test 1080BD Check on the operation of the downstream Lambda sensor	End of diagnosis	Oxygen sensor not working properly.	Replace the oxygen sensor Op. 1080B95 REAR LAMBDA SENSOR TO CATALYTIC CONVERTER - R.R