184000614 - Z62 SPEED SENSOR ERROR ELECTRIC ERROR

The diagnostic equipment signals one or more of the following errors: C1040 Right front speed sensor, electrical error, C1035 Left front speed sensor, electrical error, C1050 Right rear speed sensor, electrical error and/or C1045 Left rear speed sensor, electrical error

This error is signalled if the control unit detects an open circuit or short circuit (positive or to earth) at one of the sensors or the wiring. This fault can also be detected if the control unit connector is damaged

		Results of the tests
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) and the wiring	Move on to Step 2	Front sensor faulty	Replace the sensor Op. Op. 3340A30 RPM SENSOR (ONE) OF ONE L/H OR R/H FRONT WHEEL - R+RMove on to Step 3
			Rear sensor faulty	Replace the sensor Op.    Op. 3340A34 RPM SENSOR (ONE) OF ONE L/H OR R/H REAR WHEEL - R+RMove on to Step 3
			Wiring faulty	Restore the correct connections See E7020 ABS Move on to Step 3
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	Replace the wiring Op. 5505C28 INTERGRATED ENGINE BAY AND ABS SYSTEM WIRING - R R
			Control unit side side connector faulty	Replace the electronic control unit    Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT
3	SENSOR WIRING CHECK	All OK	Problems encountered	Operation
	Connect the Examiner and check that when the wheel involved is rotated the rpm figure is displayed by carrying out test 3340AA    See Test 3340A ABS CHECK/ADJUSTMENT DEVICES	Move on to Step 4	Wiring from control unit to connector defective	Replace the wiring
			Sensor defective	Replace the sensor
4	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Delete the errors using the diagnostic equipment.Turn the key OFF and then ON to ensure that the control unit checks whether the errors are still present.Check that the fault is no longer present	End of diagnosis	The fault persists	Move on to Step 1