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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 378 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnosis And Testing >> Anti-Lock Control - Hybrid >> Pinpoint Tests >> Pinpoint Test N: DTCs C1322, C1323, C1324 and C1325 - Brake Hydraulic Master Cylinder Piston Travel Sensor Circuit Fault/Failure >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The ABS module monitors the master cylinder piston position to determine whether the brake is being applied or not and with how much force. The sensor has 2 sets of 3 circuits:

Low resolution circuits

The ABS module sends a 5-volt reference voltage to the sensor along circuit LCB26 (BU/BN). The voltage returns along circuit RCB26 (GN/WH) and the piston position is determined using the voltage that is sent back to the ABS module along circuit VCB27 (GY/YE).

High resolution circuits

The ABS module sends a 5-volt reference voltage to the sensor along circuit LCA27 (BN/WH). The voltage returns along circuit RCA27 (WH) and the piston position is determined using the voltage that is sent back to the ABS module along circuit VCA30 (YE/VT).

DTC Description Fault Trigger Conditions
  • DTC C1322 - Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Circuit Failure
 If the ABS module detects an open, a short to voltage or a short to ground on the low resolution circuits of the brake pedal position sensor, it will set DTC C1322.
  • DTC C1323 - Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Signal Fault
 If the ABS module detects an open, a short to voltage or a short to ground on the low resolution circuits of the brake pedal position sensor, it will set DTC C1323. Also, if the information the ABS module receives from the sensor does not match information from the other brake pedal sensors, DTC C1323 will also set.
  • DTC C1324 - Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Circuit Failure
 If the ABS module detects an open, a short to voltage or a short to ground on the high resolution circuits of the brake pedal position sensor, DTC C1324 will be set.
  • DTC C1325 - Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault
 If the ABS module detects an open, a short to voltage or a short to ground on the high resolution circuits of the brake pedal travel sensor, DTC C1325 will be set. This DTC will also be set if the information the ABS module receives from the travel sensor does not match the other brake pedal sensors.

This pinpoint test is intended to diagnose the following:

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