C1225

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CIRCUIT DESCRIPTION
The speed sensor used on this vehicle is a multiple pole magnetic pickup. This sensor produces an AC signal that the EBCM/EBTCM uses the frequency from to calculate the wheel speed.

CONDITIONS FOR SETTING THE DTC
The DTC can be set when the brake is off and no wheel speed DTCs (DTC C1232 through C1235) are present.
This DTC will set anytime the EBCM sees a wheel speed variation of more than 24 Km/h (15 mph) in 0.01 seconds. The 14 Km/h (15 mph) change must occur 5 times with less than 1.00 seconds between each occurrence for a code to be set.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC stores.
^ The ABS/ETS/TCS disables.
^ The amber ABS/ETS/TCS indicator(s) turn on.

CONDITIONS FOR CLEARING THE DTC
^ Condition for DTC is no longer present and scan tool clear DTC function is used.
^ 100 ignition cycles have passed with no DTC(s) detected.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
^ If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.