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

Test Step 

1. A1 CHECK CIRCUIT 601 (LB/PK) FOR AN OPEN 
   • Key in OFF position.
   • Disconnect: ABS Module C135.
   • Key in ON position.
   • Measure the voltage between the ABS module C135 pin 8, circuit 601 (LB/PK), harness side and ground.
     Fig 1: Checking Circuit 601 (LB/PK) For An Open

     Courtesy of FORD MOTOR CO.
   • Is the voltage greater than 10 volts? 

   Result / Action to Take 

   1. Yes:  GO to A2.
   2. No:  REPAIR the circuit. REPEAT the self-test.
2. A2 CHECK THE ABS MODULE GROUNDS 
   • Measure the resistance between the ABS module C135 pin 12, circuit 1205 (BK), harness side and ground; and between the ABS module C135 pin 15, circuit 397 (BK/WH), harness side and ground.
     Fig 2: Checking ABS Module Grounds

     Courtesy of FORD MOTOR CO.
   • Are the resistances less than 5 ohms? 
   1. Yes:  GO to A3.
   2. No:  REPAIR the circuit in question. REPEAT the selftest.
3. A3 CHECK FOR CORRECT ABS MODULE OPERATION 
   • Disconnect the ABS connector.
   • Check for:
     • corrosion
     • pushed-out pins
   • Connect the ABS connector and make sure it seats correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. Yes:  INSTALL a new ABS module. REFER to MODULE . TEST the system for normal operation.
   2. No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the selftest.