Diagnostic Routine AG

Diagnostic Routine AG

Diagnostic Overview

C1A41:64

Refer to Wiring Diagram Set 31 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The ABS (Anti-Lock Brake System) module receives clutch pedal switch input from the PCM (Powertrain Control Module) over the HS-CAN (High Speed Controller Area Network). The ABS (Anti-Lock Brake System) module compares this information against brake pedal switch/sensor input to determine if the clutch pedal input is valid. A clutch pedal switch that is incorrectly installed can cause a signal plausibility concern. Also, an implausible signal can been created if a driver is resting one foot on the clutch pedal while using the other foot to press the accelerator.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Make sure the clutch pedal switch electrical connector is connected and free of corrosion and other contaminates.

- Make sure the clutch pedal switch is installed correctly.

- Make sure the clutch pedal switch is operating correctly.

Pinpoint Test

1. CHECK THE PCM (Powertrain Control Module) CLUTCH PEDAL BEYOND TOP OF TRAVEL SWITCH POINT (CPP_TOP) PID (Parameter Identification)

1. Ignition ON.

2. Using a scan tool, monitor the PCM (Powertrain Control Module) CPP_TOP PID (Parameter Identification) while pressing and releasing the clutch pedal.

Does the PID (Parameter Identification) display YES with the pedal pressed and NO with the pedal released?






2. CHECK THE ABS (Anti-Lock Brake System) MODULE DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

2. Retrieve and record all ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).

Are any communication (U-code) DTCs (Diagnostic Trouble Codes) present?






3. CHECK THE PCM (Powertrain Control Module) FOR DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, carry out the PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) self-test.

2. Retrieve and record all PCM (Powertrain Control Module) DTCs (Diagnostic Trouble Codes).

Are any PCM (Powertrain Control Module) DTCs (Diagnostic Trouble Codes) present?






4. CHECK FOR CORRECT ABS (Anti-Lock Brake System) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect the ABS (Anti-Lock Brake System) module electrical connector.

3. Repair:

- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Connect the ABS (Anti-Lock Brake System) module electrical connector. Make sure it seats and latches correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?