Pinpoint Test A: No Communication With The Anti-Lock Brake System Module

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 1087 (OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: ABS Module C135.
- Key in ON position.
- Measure the voltage between the ABS module connector C135 pin 8, circuit 1087 (OG), harness side and ground.
  
  Fig 1: Measuring Voltage Between ABS Module Connector C135 Pin 8, Circuit 1087 (OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A2.
- No : REPAIR the circuit. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART
A2 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN
- Measure the resistance between the ABS module C135 pin 15, circuit 1203 (BK/LB), harness side and ground.
  
  Fig 2: Measuring Resistance Between ABS Module C135 Pin 15, Circuit 1203 (BK/LB), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : CHECK the CAN communications network. REFER to MODULE COMMUNICATIONS NETWORK .
- No : REPAIR the circuit. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART