169000477 - Z63 SPEED SENSORS ERROR PLAUSIBILITY ERROR

The diagnostic equipment signals one or more of the following errors: "C1041 Right front speed sensor, plausibility error", "C1036 Left front speed sensor, plausibility error", "C1051 Right rear speed sensor, plausibility error" and/or "C1046 Left rear speed sensor, plausibility error"

this error is signalled if the control unit does not detect electrical type problems, but the speed of one of the wheels (transmitted by the sensor) is not felt to be plausible

1	SENSOR CHECK	All OK	Problems encountered	Operation
	Visually inspect the state of the sensors affected by the error (front and/or rear, right and/or left).In particular, check:- that there are no metal shavings in the flywheel magentic tracks- that the sensor involved is correctly fitted - that the sensor involved does not show signs of abrasion or distortionPosition the vehicle on a lift and check the condition of the flywheel, removing the wheel, if necessary.In particular, check that there are no metal shavings in the flywheel magnetic tracks	Move on to Step 2 1	Presence of metal shavings Sensor fitting faulty Front sensor faulty Rear sensor faulty Front flywheel damaged Rear flywheel damaged	Clean the flywheel track. Move on to Step 2 Refit correctly. Move on to Step 2 Replace the sensor and move on to Step 2    Op. 3340A30 RPM SENSOR (ONE) OF ONE L/H OR R/H FRONT WHEEL - R+R Replace the sensor and move on to Step 2    Op. 3340A34 RPM SENSOR (ONE) OF ONE L/H OR R/H REAR WHEEL - R+R Replace the hub    Op. 4450C34 BEARING OF ONE FRONT WHEEL HUB, L/H OR R/H - REPLACE WITH PILLAR REMOVED Replace the hub    Op. 4450D10 HUB OF ONE REAR WHEEL, L/H OR R/H - R+R WITH WHEEL REMOVED
2	CONTROL UNIT CONNECTOR CHECK	All OK	Problems encountered	Operation
	Check that the control unit connector is not faulty at the pins (on both the wiring side and the control unit side) by carrying out a visual inspection.In particular, check that:- They are not oxidized- They are not distorted or broken	Move on to Step 3	Wiring side connector faulty Control unit side side connector faulty	Replace the wiring Op. 5505C28 CABLAGGIO INTEGRATO VANO MOTORE E IMPIANTO A.B.S. - S.R. Replace the electronic control unit    Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT
4	SENSOR WIRING CONTINUITY CHECK	All OK	Problems encountered	Operation
	Check the continuity of the wiring from the control unit to the intermediate connector for the wheel rpm sensor wiring.	Move on to Step 5	Wiring defective	Replace the wiring from the control unit to the connector
5	WHEEL SPEED CORRECT VALUE CHECK	All OK	Problems encountered	Operation
	Position the vehicle on a roller bench, set the speed at between 4 and 6 km/h and evaluate the wheel speed using the Examiner	Move on to Step 6	Wheel sensor defective End section of wiring from the wheel sensor to the connector defective	Replace the faulty wheel sensor Replace the end section of the wiring from the wheel sensor to the connector
6	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Delete the errors using the diagnostic equipment.Carry out the road test    See Test 3340OA A.B.S. SYSTEM ACTUATION CHECKto ensure that the control unit checks whether there are any errors still present.Return to the workshop and check that the fault is no longer present using the diagnostic equipment	End of diagnosis	The fault persists	Move on to Step 1