23 · Diagnostics

Interference error on speed sensors

Make: Fiat
Model: Panda Factory Service Manual
Year: 2003–2012
Section: Examiner › Interference error on speed sensors

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Fault diagnosisInterference error on speed sensors

INTERFERENCE ERROR ON SPEED SENSORS

The diagnostic equipment signals the following error: "C1250 - interference error at speed sensors"

this error is signalled if the control unit detects that the speed of one of the wheels (transmitted by the sensor) differs by more than 6 km/h from that of the others. This happens if the magnetic wheel is not correct or is damaged, if there are impurities, or if the sensor fitting is not correct or the signal incorrect

1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and, in the PARAMETERS ambient, display the wheel speed. With the vehicle raised on a two column lift, rotate the wheels by hand and check that the diagnostic equipment signals the change in wheel speed.	Move on to Step 3	One or more wheels do not signal the correct change in speed	Move on to Step 2 carrying out the checks on the wheel in question
2	SENSOR CHECK	All OK	Problems encountered	Operation
	Visually inspect the state of the sensors involved (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 shows no signs of abrasion or distortion Check that there are no interference elements in the system wiring: After market components Electromagnetic wave sources	Move on to Step 3	Presence of metal shavings Sensor fitting faulty Front sensor faulty Rear sensor faulty Front magnetic wheel faulty Rear magnetic wheel faulty	Clean the flywheel track Refit correctly Replace the sensor Op. 3340A30 RPM SENSOR (ONE) OF ONE L/H OR R/H FRONT WHEEL - R+R Replace the sensor Op. 3340A34 RPM SENSOR (ONE) OF ONE L/H OR R/H REAR WHEEL - R+R Replace the sensor Op. 4450C34 BEARING OF ONE FRONT WHEEL HUB, L/H OR R/H - REPLACE WITH PILLAR REMOVED Replace the sensor Op. 4450D10 HUB OF ONE REAR WHEEL, L/H OR R/H - R+R WITH WHEEL REMOVED
3	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Delete the errors using the diagnostic equipment. Road test the vehicle See Test 3340A ABS CHECK/ADJUSTMENT DEVICES See Test 3350AA ASR SYSTEM ACTUATION SYSTEM See Test 3350EA ESP SYSTEM ACTUATION CHECK to 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

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Parts & tools for this job For 2003 Fiat Panda

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