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

CAUTION: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 CHECK VOLTAGE TO THE ABS MODULE
- Key in OFF position.
- Disconnect: ABS Module C135 (with traction control).
- Disconnect: ABS Module C155 (without traction control).
- Key in ON position.
- If equipped with traction control, measure the voltage between ABS module C135-4, circuit 15-CF6 (GN/YE), harness side and ground.
  
  Fig 1: Checking Voltage To ABS Module (1 Of 2)
  Courtesy of FORD MOTOR CO.
- If not equipped with traction control, measure the voltage between ABS module C155-20, circuit 15-CF6 (GN/YE), harness side and ground.
  
  Fig 2: Checking Voltage To ABS Module (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
Yes : GO to A2.

No : VERIFY that battery junction box (BJB) fuses 15 (20A), 24 (30A) and 29 (10A), are OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A2 CHECK THE ABS MODULE GROUND(S)
- Key in OFF position.
- If equipped with traction control, measure the resistance between ABS module C135-16, circuit 31-CF6 (BK), harness side and ground; and between ABS module C135-47, circuit 31-CF13 (BK), harness side and ground.
  
  Fig 3: Checking ABS Module Ground (1 Of 2)
  Courtesy of FORD MOTOR CO.
- If not equipped with traction control measure the resistance between ABS module C155-26, circuit 31-CF6 (BK), harness side and ground.
  
  Fig 4: Checking ABS Module Ground (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : REFER to MODULE COMMUNICATIONS NETWORK .

No : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.