Antilock Braking System (ABS)

Circuit Description

DTCs 65 and 66 relate to the pump motor relay in the BPMV. The relay is located inside the BPMV and can- not be serviced. The BPMV must be replaced if these tests show the relay has failed. These DTCs can be set by poor power and ground at the 2-way connector or applying the brakes during an erratic speed signal.

Test Description

- Check the various conditions that can cause these DTCs.
- Check if DTCs will clear.
- Check if DTC resets after several function tests with the Tech 1.

Diagnostic Aids

A DTC 65 relates to the 12 volt side of the two-way connector.

If DTC 65 appears with other DTCs, first repair the other DTCs, clear DTCs, and run three function tests with the Tech 1. If DTC 65 resets, refer to this diagnostic chart.

If a DTC 66 sets with other DTCs, check for a poor ground in the two-way connector harness.

Do not pierce the electrical connectors, wires, seals, or insulation during testing. Doing so will break the seal and lead to corrosion and failure of the wiring and terminals.