Circuit Description
As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | All of the wheel speed sensor signals are above 32 km/h (20 mph) when the brake is applied or 19 km/h (12 mph) when the brake is released. |
Conditions for Setting the DTC
Either of the following conditions will set DTC C0229:
| • | A sudden loss of both of the front wheel speed sensor signals is detected for 15 milliseconds. |
| • | A sudden increase is detected in both of the front wheel speed sensor signals at a rate greater than 8.8 km/h (5.5 mph) for 105 milliseconds. |
Action Taken When the DTC Sets
| • | The ABS and BRAKE indicators are commanded on. |
| • | The ABS and DRP are disabled for the remainder of the ignition cycle. |
Conditions for Clearing the DTC
| • | Repair the condition(s) responsible for setting the DTC. |
| • | Use the scan tool in order to clear the DTC. |
| • | After the DTC is cleared and the ignition is ON, the ABS indicator remains on until the EBCM completes a power-up self-test. This test concludes when the vehicle reaches a speed of greater than 13 km/h (8 mph) and the wheel speeds are verified by the EBCM. |
Diagnostic Aids
Driving the vehicle on extremely rough terrain can set DTC C0229 even if the system is not malfunctioning.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Inspect for the following:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Corrosion |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physically damaged wiring |
| • | Wiring broken inside the insulation |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
3 | Inspect for poor connections at the harness connector of the 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 5 | Go to Step 4 |
4 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Important: Perform the Tire Size Calibration procedure. Refer to Scan Tool Diagnostics Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC set? | Go to Step 3 | System OK |
