Pinpoint Test A : C2005:78, C2006:78
- Refer to Vehicle Dynamic Systems
for schematic and connector information.
Normal Operation and Fault Conditions
The ABS module measures the current draw of both actuator motors during each parking brake apply request. Current draw measurement for these 2 Diagnostic Trouble Codes (DTCs) starts when the caliper piston and brake pad start moving and stops when the brake pad contacts the brake disc, this is known as free run. If the free run current draw exceeds the programmed limit, the ABS module sets a DTC. This is most likely caused by high mechanical resistance in the actuator or motor, a shorted motor, a blocked motor or a seized motor.
REFER to: Parking Brake - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition ABS C2005:78 Right Actuator: Alignment Or Adjustment Incorrect This DTC sets when actuator state was set to unknown due to unexpected powerdown or invalid stored data and at least one actuator state is detected as unknown. ABS C2006:78 Left Actuator: Alignment Or Adjustment Incorrect This DTC sets when actuator state was set to unknown due to unexpected powerdown or invalid stored data and at least one actuator state is detected as unknown. Possible Sources
- Unexpected powerdown
- A1 CHECK FOR OTHER ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, carry out the ABS module self-test.
Are there additional Diagnostic Trouble Codes (DTCs) set in the ABS module?
Yes For all other ABS module Diagnostic Trouble Codes (DTCs), GO to the DTC Chart: Anti-Lock Brake System (ABS) Module. No GO to A2 - A2 USING THE DIAGNOSTIC SCAN TOOL
- Clear DTC.
- Using a diagnostic scan tool, carry out the ABS module self-test.
Are there additional Diagnostic Trouble Codes (DTCs) set in the ABS module again?
Yes GO to A1 No GO to A3 - A3 CARRY OUT THE APPLY AND RELEASE ROUTINE
- Make sure the parking brakes are released.
- Using a diagnostic scan tool, carry out the EPB apply and release routine.
Is the concern still present?
Yes GO to A1 No The system is operating correctly at this time. The problem may have been caused by an unexpected powerdown or invalid data.