Circuit Description
The traction control switch is a momentary-contact, normally-open switch that can be used to disable the traction control system (TCS). Each time the traction control switch is pressed, the TCS enabled/disabled status changes. When TCS is disabled, the electronic brake control module (EBCM) illuminates the traction off indicator by opening the service traction control signal circuit.
Conditions for Running the DTC
- The ignition is ON.
- The engine is running at a rate greater than 450 RPM.
Conditions for Setting the DTC
The EBCM detects low voltage on the traction control switch signal circuit for 10 seconds.
Action Taken When the DTC Sets
If equipped, the following actions occur
- The EBCM disables the TCS.
- The traction off indicator turns ON.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Electrical Intermittents , Testing for Intermittent Conditions and Poor Connections , Wiring Repairs and Connector Repairs in Wiring Systems.
Test Description
The number below refers to the step number on the diagnostic table.
- 4: This step tests the traction control switch circuitry. If the fuse opens when you perform this test, the traction control switch signal circuit is shorted to ground.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: ABS Schematics Connector End View Reference: ABS Connector End Views | |||
| 1 | Did you perform the antilock brake system (ABS) Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - ABS |
| 2 | Use a scan tool in order to clear the DTCs. Turn OFF the ignition for 5 seconds. Start the engine and allow the engine to run for at least 20 seconds. Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
| 3 | Turn OFF the ignition. Disconnect the traction control switch harness connector. Refer to Traction Control Switch Replacement . Turn ON the ignition. Connect a test lamp between the ignition 1 voltage circuit and a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 8 |
| 4 | Use the scan tool in order to clear the DTCs. Turn OFF the ignition. Connect a fused jumper wire between the ignition 1 voltage circuit and the traction control switch signal circuit at the traction control switch harness connector. Start the engine and allow the engine to run for at least 20 seconds. Does the DTC set? | Go to Step 5 | Go to Step 9 |
| 5 | Test the traction control switch signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
| 7 | IMPORTANT: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement .Did you complete the replacement? | Go to Step 11 | |
| 8 | Repair the open in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 11 | |
| 9 | Inspect for poor connections at the harness connector of the traction control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
| 10 | Replace the traction control switch. Refer to Traction Control Switch Replacement . Did you complete the replacement? | Go to Step 11 | |
| 11 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 3 | System OK |
| IMPORTANT |
|---|
| Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. |
DTC C0283
The EBCM supplies 5 VDC to the powertrain control module (PCM) on the delivered torque signal circuit. The PCM toggles this voltage to ground in order to create the delivered torque signal at the EBCM. A signal with a frequency of 128 Hz +/- 5 percent and a duty cycle of 25-95 percent is a valid delivered torque signal. The percentage of duty cycle is proportionate to the percentage of delivered torque.
- The ignition is ON.
- The engine is running at a speed greater than 450 RPM for 1 second.