Pinpoint Test E: DTC C0040:64

Anti-Lock Control

Pinpoint Test E: DTC C0040:64

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information Electrical Diagrams.

Normal Operation

The ABS module receives brake pedal input from the PCM over the High Speed Controller Area Network (HS-CAN). 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. A brake pedal switch that is misadjusted or incorrectly installed can cause a signal plausibility concern.

- DTC C0040:64 (Brake Pedal Switch "A": Signal Plausibility Failure)- this DTC sets 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).

This pinpoint test is intended to diagnose the following:

- Stoplamp concern

- Communication concern

- ABS module

PINPOINT TEST E : DTC C0040:64

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

E1 CHECK THE STOPLAMPS FOR CORRECT OPERATION

- Inspect the brake pedal position switch and make sure it is adjusted correctly. 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 E2.

No
REFER to Lighting and Horns.

E2 CHECK THE ABS MODULE DTCs

- Review the ABS module DTCs retrieved during Inspection and Verification.

Are any communication (U-code) DTCs present?

Yes
REFER to the ABS Module DTC Chart and DIAGNOSE the U-code DTCs Anti-Lock Brake System (ABS) and Stability Control.

No
GO to E3.

E3 CHECK THE PCM FOR DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self-Test- PCM KOEO (Key ON Engine OFF).

- 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
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.

If vehicle is equipped with adaptive cruise control, INSTALL a new HCU (Hydraulic Control Unit). REFER to Hydraulic Control Unit (HCU) .