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

Test Step 

1. A1 CHECK CIRCUIT 605 (RD), 534 (YE/LG) AND 483 (RD) FOR POWER 
   • Key in OFF position.
   • Disconnect: Anti-Lock Brake Control Module C135.
   • Key in ON position.
   • Measure the voltage between the ABS module C135 pins, harness side and ground as follows:
     VOLTAGE
     
     

     ABS Module C135 Pin	Circuit
     20	605 (RD)
     11	483 (RD)
     28	534 (YE/LG)

     Fig 1: Measuring Voltage Between ABS Module C135 Pins, Harness Side And Ground

     Courtesy of FORD MOTOR CO.
   • Are the voltages greater than 10 volts? 

   Result / Action to Take 

   1. Yes  : GO to A2.
   2. No  : REPAIR the circuit(s) in question. TEST the system for normal operation.
2. A2 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
   • Key in OFF position.
   • Measure the resistance between the ABS module C135 pin 1, circuit 57 (BK), harness side and ground; and between the ABS module C135 pin 18, circuit 57 (BK), harness side and ground.
     Fig 2: Measuring Resistance Between ABS Module C135 Pin, Circuit

     Courtesy of FORD MOTOR CO.
   • Are the resistances less than 5 ohms? 
   1. Yes  : CHECK the module communications network. REFER to MODULE COMMUNICATIONS NETWORK to diagnosis the module communication network.
   2. No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test with the brake pedal not applied.