Diagnostic Instructions
DTC Descriptors
DTC C0220: Left Front Antilock Brake System (ABS) Channel in Release Too Long
DTC C0221: Right Front Antilock Brake System (ABS) Channel in Release Too Long
DTC C0222: Rear Antilock Brake System (ABS) Channel in Release Too Long
DTC C0223: Left Front Antilock Brake (ABS) Channel Motor Free Spins
DTC C0224: Right Front Antilock Brake (ABS) Channel Motor Free Spins
DTC C0225: Rear Antilock Brake System (ABS) Channel Motor Free Spins
DTC C0226: Left Front Traction Control System (TCS) Channel Will Not Move
DTC C0227: Right Front Traction Control System (TCS) Channel Will Not Move
DTC C0228: Left Rear Antilock Brake System (ABS) Channel in Release Too Long
DTC C0229: Right Rear Antilock Brake System (ABS) Channel in Release Too Long
Circuit/System Description
The system relay is energized when the ignition is ON. The system relay supplies voltage to the valve relay. The electronic brake control module (EBCM) activates the valve relay to supply voltage to the valve solenoids. This voltage is referred to as the
system voltage. The EBCM microprocessor activates individual valve solenoids by grounding the valve solenoid control circuits. The power brake booster pump is internal to the brake pressure modulator valve (BPMV). The pump motor is not serviceable.
Conditions for Running the DTC
| • | The system and ignition voltage is greater than 8 volts. |
| • | The system is in an ABS braking event. |
Conditions for Setting the DTC
The EBCM commands a dump or isolation solenoid ON for greater than 28 seconds.
Action Taken When the DTC Sets
| • | The EBCM disables the ABS/Traction Control System (TCS). |
| • | The ABS indicator turns ON. |
| • | The Traction OFF indicator turns ON. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and you can use the scan tool clear DTCS function. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
The most likely cause of this DTC is a mechanical failure that causes a wheel to lock and remain locked. Always diagnose and repair any wheel speed sensor failures prior to diagnosing DTCs C0220, C0221, C0228, C0229. These DTCs in theory may be set on
surfaces that are nearly impossible to get traction on. If the DTC sets within these conditions, diagnosis of the ABS system may not be necessary.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Verification
- Ignition ON, use the scan tool to perform the solenoid test.
| ⇒ | If solenoid test failed, replace the EBCM. |
- If all circuits test normal, replace the BPMV.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Test for less than 5 ohm of resistance between the ground circuit terminals 1, and 29 and ground.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Ignition ON, verify that a test lamp illuminates between the Pump Motor Signal circuit terminal 10 and ground.
| ⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit Hydromax fuse is open or fuse 4 of the fuse block, test or replace the brake
pressure modulator valve (BPMV). |
- Ignition ON, use the scan tool to perform the solenoid test.
| ⇒ | If solenoid test failed, replace the EBCM. |
- If all circuits test normal, replace the BPMV.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
