C1225

CIRCUIT DESCRIPTION
The WSS is a single point magnetic pickup that produces an AC signal. The Electronic Brake Control Module/Electronic Brake Traction Control Module (EBCM/EBTCM) uses the signal frequency in order to calculate the wheel speed.

CONDITIONS FOR SETTING THE DTC
The Diagnostic Trouble Code (DTC) can be set anytime the brake is not depressed and no wheel speed sensor hardware DTC(s) are present, and the EBCM/EBTCM sees a wheel speed variation of more than 14 km/h (9 mph) for 2.5 seconds.
^ The brake pedal is not pressed
^ No WSS hardware DTCs are present
^ The EBCM/EBTCM sees a wheel speed variation greater than 14 km/h (9 mph) for 2 5 seconds

ACTION TAKEN WHEN THE DTC SETS
^ A DTC C1225 is stored
^ The AE3S1CS is disabled
^ The ABS and the TRACTION OFF indicators are turned on

CONDITIONS FOR CLEARING THE DTC
^ The condition for the DTC is no longer present and the scan tool Clear DTC function is used
^ 50 ignition cycles have passed with no DTCs detected

DIAGNOSTIC AIDS
^ Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors can result in misdiagnosis. Misdiagnosis may cause replacement of parts without repairing the malfunction.
^ The following conditions may cause an intermittent malfunction:
- Poor connections
- Broken insulation
- A broken wire inside the insulation
^ If an intermittent malfunction exists, refer to Troubleshooting Procedures.

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