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On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE C1206 Left rear wheel speed sensor circuit open or shorted • Ignition switch: • Vehicle: Running ABS module • Left Rear wheel • Harness is open or • ABS module DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on. • With the scan tool, record and erase stored DTCs in the ABS module. • Cycle the ignition switch from off to on. • Start the engine and warm it to normal operating temperature. • Turn ignition switch off and wait for a few seconds. • Start the engine. With the scan tool connected to the DLC, drive the vehicle over 40 km/h (25 mph). NOTE : • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 12 Brakes for more information). • Erase all codes and test drive the vehicle to verify the repair is complete. NOTE : Diagnostic Procedure 1. CHECK ABS MODULE DTC • With the scan tool select: View ABS Data Stream. • With an assistant driving the vehicle, check the following data stream list items while driving the vehicle over 40 km/h (25 mph). − Left Front Wheel Speed − Right Front Wheel Speed − Left Rear Wheel Speed − Right Rear Wheel Speed • With the scan tool, read active DTCs in the ABS module. Is DTC C1206 present and the Left Rear Wheel Speed signal abnormal? Yes >> Go to the next step. No >> The condition that caused this DTC to set is currently not present (See Diagnostic Help and Intermit- tent DTC Troubleshooting in Section 12 Brakes for more information). DIAGNOSIS & TESTING
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