Circuit Description
As the wheel spins, the wheel speed sensor produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Running the DTC
C0221 and C0225
The ignition is ON.
C0222, C0223, C0226 and C0227
The vehicle speed is greater than 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
C0221 and C0225
The EBCM detects an open or shorted wheel speed sensor or wheel speed sensor circuit for 500 milliseconds.
C0222 and C0226
The corresponding wheel speed sensor signal is less than 6 km/h (4 mph) for 5 seconds, or 120 seconds in order to set both DTCs.
C0223 and C0227
The EBCM detects an erratic signal from the corresponding wheel speed sensor for 105 milliseconds.
Action Taken When the DTC Sets
| • | The EBCM disables the ABS. |
| • | The ABS 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
Operating the vehicle on extremely rough terrain can set DTC C0223, C0227 or C0229 even if the system is functioning normally.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
If the customer concern is that the ABS indicator is ON only during humid conditions such as rain, snow or vehicle wash, thoroughly inspect the wheel speed sensor circuits for signs of water intrusion. Use the following procedure in order to help isolate the problem area:
- Spray the suspected area with a 5 percent salt water solution.
- Drive the vehicle at a speed greater than 19 km/h (12 mph) for at least 30 seconds.
Repair or replace the suspect harness if the DTC sets.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Important: If DTC C0229 is set, diagnose DTC C0229 before diagnosing any other wheel speed sensor DTCs. | ||||||||||||
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |||||||||
2 |
Does the DTC set? | 19 km/h (12 mph) | Go to Step 3 | Go to Diagnostic Aids | ||||||||
3 |
Does the resistance measure within the specified range? | 1980-3850 ohms | Go to Step 4 | Go to Step 8 | ||||||||
4 |
Does the voltage measure greater than the specified value? | 100 mV | Go to Step 5 | Go to Step 8 | ||||||||
5 | Inspect for poor connections at the harness connector of the wheel speed sensor. 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 10 | Go to Step 6 | ||||||||
6 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 | ||||||||
7 | 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 10 | Go to Step 9 | ||||||||
8 | Replace the wheel speed sensor. Refer to Wheel Speed Sensor Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||||
9 |
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 10 | -- | ||||||||
10 |
Does the DTC reset? | -- | Go to Step 3 | System OK | ||||||||
