C1221

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 will set the left front wheel speed = 0 and the other wheel speeds are greater than 8 Km/h (5 mph) for 2.5 seconds.
This DTC can only be set with the following conditions:
^ When DTC C1232 through C1235 are not set as a current DTC(s).
^ Vehicle is not in an ABS stop.
^ Brake switch is off.

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.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
7. Checks the resistance of the WSS.
9. Checks if the WSS CKTs are shorted together.