Normal Operation

The ABS module monitors the pressure of the hydraulic brake system through the use of a brake pressure transducer. The transducer sends a signal to the ABS module that varies in relation to the amount of pressure applied to the brake pedal. The more pressure that is applied, the greater the signal send to the ABS module. The brake pressure transducer is internal to the Hydraulic Control Unit (HCU) and cannot be serviced separately. If a new brake pressure transducer is needed, a new HCU must be installed.

• DTC C1288 (Pressure Sensor Main/Primary Input Circuit Failure) - If there is an incorrect connection between the ABS module and HCU, if the brake pressure transducer is faulted or if the ABS module is faulted internally, this DTC sets.

This pinpoint test is intended to diagnose the following: 

• ABS module
• HCU