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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 690 (Anti-Lock Brake System) >> Diagnostic Information and Procedures >> DTC C1221To C1235: Wheel Speed Sensor Circuit Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4.  Measures the resistance of the wheel speed sensor in order to determine if the sensor has a valid resistance value.
  2. 5.  Ensures that the wheel speed sensor is generating a valid AC voltage output.
Fig 1: DTC C1221-C1235
G01810815Courtesy of GENERAL MOTORS CORP.
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