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Home › Chevrolet › 2004 › Optra Base, Standard › Repair and Diagnosis › Brakes › Traction Control › Anti-Lock Brake System › Diagnostic Information and Procedures › DTC C0245 › Test Description

Test Description

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

  1. 1:  This step begins the examination of the front wheel speed sensors.
  2. 3:  This step inspects for a problem with one of the front toothed rings.
  3. 5:  This step inspects the front wheel speed sensors.
  4. 7:  This step inspects for shorts in a front wheel speed sensor harness.
  5. 9:  This step inspects for opens in a front wheel speed sensor harness.
  6. 11:  This step begins an inspection of the rear wheel speed sensors.
  7. 13:  This step inspects for a problem with one of the rear toothed rings.
  8. 15:  This step inspects the rear wheel speed sensors.
  9. 17:  This step inspects for shorts in a rear wheel speed sensor harness.
  10. 19:  This step inspects for opens in a rear wheel speed sensor harness.
Step Action Values Yes No
1  Visually inspect the wiring for the front wheel speed sensors.
Is there any damage?		 - Go to Step 2  Go to Step 3 
2 Verify that the correct outer constant velocity (CV) joints are installed on the vehicle. The front speed rings have 47 teeth and the rear speed rings have 29 teeth.
Did you complete the action?		 - System OK -
3  Inspect fuse EF2 in the engine fuse block.
Is fuse EF2 open?		 - Go to Step 4  Go to Step 5 
4 Replace fuse EF2.
Did you complete the replacement?		 - System OK -
5 
  1. Disconnect the wheel speed sensor harnesses from the wheel speed sensor connectors.
  2. Measure the wheel speed sensor resistance at the wheel speed sensor connector terminals.
Does the resistance measure within the specified range for both wheel speed sensors?		 1280-1920 Ω Go to Step 7  Go to Step 6 
6 Replace the faulty wheel speed sensor.
Did you complete the replacement?		 - System OK -
7 
  1. Disconnect the antilock brake system (ABS) control module connector.
  2. Test each wheel speed sensor harness for a short circuit between its wires with a digital ohmmeter attached to the 2 terminals at the harness side of the wheel speed sensor connector.
  3. Test each wheel speed sensor harness wire for a short to ground from the connector terminals.
Is there any short circuit in either wheel speed sensor harness?		 - Go to Step 8  Go to Step 9 
8 Repair the short circuit in the wiring or from a wiring harness to ground.
Did you complete the repair?		 - System OK -
9  Test the continuity of the wiring in both front wheel speed sensor circuits between the ABS connector and the wheel speed sensor wheel speed sensor connector on each side of the vehicle.
  • The left side uses terminals 6 and 7 at the ABS connector.
  • The right side uses terminals 4 and 5 at the ABS connector.

Is the continuity good for both harnesses?		 - Go to Step 11  Go to Step 10 
10 Repair the discontinuity found in the front wheel speed sensor harness.
Did you complete the repair?		 - System OK -
11 
  1. Visually inspect the wiring for the rear wheel speed sensors.
  2. Make sure that the wheel speed sensors are properly mounted and that the retaining bolts are properly tightened.
Is there any damage?		 - Go to Step 12  Go to Step 13 
12 Repair or replace components as required.
Did you find and correct the condition?		 - System OK -
13  Remove each wheel speed sensor from the rear knuckles and inspect the toothed ring through the wheel speed sensor mounting holes.
  • Inspect for any damaged or missing teeth.
  • Inspect that the ring is properly positioned under the wheel speed sensor.

Is there any damage or other fault with either speed ring?		 - Go to Step 14  Go to Step 15 
14 Replace the rear wheel hub with the proper unit.
Did you complete the replacement?		 - System OK -
15 
  1. Disconnect the rear wheel speed sensor harnesses from the wheel speed sensor connectors.
  2. Measure the wheel speed sensor resistance at the wheel speed sensor connector terminals.
Does the resistance measure within the specified range for both wheel speed sensors?		 1280-1920 Ω Go to Step 17  Go to Step 16 
16 Replace the faulty wheel speed sensor.
Did you complete the replacement?		 - System OK -
17 
  1. The ABS control module connector should still be disconnected. Disconnect it now if it is not.
  2. Test each wheel speed sensor harness for a short circuit between its wires with a digital ohmmeter attached to the 2 terminals at the harness side of the wheel speed sensor connector.
  3. Test each wheel speed sensor harness wire for a short to ground from the connector terminals.
Is there any short circuit in either wheel speed sensor harness?		 - Go to Step 18  Go to Step 19 
18 Repair the short circuit in the wiring or from a wire to ground.
Did you complete the repair?		 - System OK -
19  Test the continuity of the wiring in both rear wheel speed sensor circuits between the ABS connector and the wheel speed sensor wheel speed sensor connector on each side of the vehicle.
  • The left side uses terminals 8 and 9 at the ABS connector.
  • The right side uses terminals 1 and 3 at the ABS connector.

Is continuity good for both harnesses?		 - Go to Step 21  Go to Step 20 
20 Repair the discontinuity found in the rear wheel speed sensor wheel speed sensor harness or connector C110.
Did you complete the repair?		 - System OK -
21 Replace the ABS unit.
Did you complete the replacement?		 - System OK -
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