Pinpoint Test I: DTC C0040:64
Anti-Lock Control - Traction Control and Stability Assist
Pinpoint Tests
Pinpoint Test I: DTC C0040:64
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
The ABS module receives brake pedal input from the PCM over the High Speed Controller Area Network (HS-CAN) bus. The ABS module compares this information against other inputs (wheel speed signals, vehicle speed signal, brake pressure transducer) to determine if the brake pedal input is valid.
- DTC C0040:64 (Brake Switch Circuit Failure) - If, during normal operation or the on-demand self test, the ABS module cannot detect the brake pedal input or if the brake pedal input does not match information from other sensors (wheel speed signals, vehicle speed signal, brake pressure transducer), DTC C0040:64 will be set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake pedal switch
PINPOINT TEST I: DTC C0040:64
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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I1 VERIFY CORRECT STOPLAMP SWITCH INSTALLATION
- Check the stoplamp switch for correct installation.
- Is the stoplamp switch correctly installed?
Yes
GO to I2.
No
REMOVE the stoplamp switch and INSTALL it correctly. REFER to Lighting and Horns. CLEAR the DTCs. TEST DRIVE the vehicle above 40 km/h (25 mph) and CARRY OUT 4 complete stops.
REPEAT the self-test.
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I2 CHECK THE STOPLAMPS FOR CORRECT OPERATION
- Check the stoplamps for correct operation by pressing and releasing the brake pedal and observing the stoplamps.
- Do the stoplamps operate correctly?
Yes
GO to I3.
No
REFER to Lighting and Horns for further diagnosis of the stoplamps.
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I3 CHECK THE ABS MODULE DTCs
- Review the ABS module DTCs retrieved during Inspection and Verification.
- Are any communication (U-code) DTCs present?
Yes
GO to the ABS Module DTC Chart and diagnose the U-code DTCs. Anti-Lock Control - Traction Control and Stability Assist
No
GO to I4.
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I4 CHECK THE PCM FOR DTCs
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - PCM .
- Retrieve and record any PCM DTCs.
- Are any DTCs present in the PCM?
Yes
REFER to Computers and Control Systems Information to diagnose the PCM.
No
GO to I5.
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I5 CHECK THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module .
- Monitor the BOO_ABS PID while pressing and releasing the brake pedal.
- Does the PID display match the brake pedal position?
Yes
The system is operating correctly at this time. CLEAR the DTCs. REPEAT the self-test.
No
GO to I6.
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I6 CHECK THE PCM BRAKE ON/OFF (BOO1) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM .
- Monitor the BOO1 PID while pressing and releasing the brake pedal.
- Does the PID display match the brake pedal position?
Yes
REFER to Information Bus to diagnose the HS-CAN bus.
No
REFER to Lighting and Horns to diagnose the stoplamp switch.
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