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

A1 CHECK CIRCUIT 1087 (OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: ABS Module C135.
- Key in ON position.
- Measure the voltage between ABS module connector C315-8, circuit 1087 (OG), harness side and ground.
  
  Fig 1: Checking Circuit 1087 (OG) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to A2.

No : VERIFY the smart junction box (SJB) fuse 27 (10A) is OK. If OK, 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 ABS module C135-15, circuit 1203 (BK/LB), harness side and ground.
  
  Fig 2: Checking Circuit 1203 (BK/LB) For Open
  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 .