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Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 1526
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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How to replace a speedometer cable?

Customer Question

How to replace a speedometer cable?
Submitted: 1 year ago.
Category: Jaguar
Expert:  Juan Crespo replied 1 year ago.

Hi there. Welcome to our site.

On the '93-'94 cars, all the wheel speed sensors connect to the Anti-Lock Brake System ECU, which is mounted on the left inner wheel well in the trunk. But the ABS ECU determines road speed based only on the signal from the front right wheel sensor.

THE ABS ECU sends the road speed signal to the Instrument Pack on a Green wire with a Pink tracer line. The Instrument Pack forwards the signal on to the ECM on a Brown wire.

You can check for debris or corrosion on the body of the right front wheel speed sensor and its toothed reluctor ring; clean the sensor's electrical connector with zero-residue electrical contact cleaner spray, allow it to dry, then carefully re-seat the two halves of the connector; and carefully inspect the sensor wiring harnesses for damage.

Also, check the VCM for the FF 68 Diagnostic Trouble Code, which indicates a problem with a road speed sensor circuit or the signal from the ABS ECU to the Instrument Pack. To check, turn the key to Position II (Ignition ON) but do not start the engine. Press the VCM (Vehicle Condition Monitor) button on the trip computer to the right of the steering wheel, and watch for a message in the small display below the speedometer.

Please let me know what you find.