Pinpoint Test A: The Anti-Lock Brake System (Abs) Module Does Not Respond To The Diagnostic Tool

A1 CHECK THE ABS MODULE C135 FOR DAMAGE
- Key in OFF position.
- Disconnect: ABS Module C135.
- Inspect the ABS module C135 for damage.
- Is the ABS module C135 OK?
- Yes : GO to A2.
- No : REPAIR the ABS module C135 as necessary. CARRY OUT the diagnostic tool data link test.
A2 CHECK CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE ABS MODULE C135
- Measure the resistance between the ABS module C135 pin 18, circuit 1827 (WH/LG), harness side and the DLC C251 pin 6, circuit 1827 (WH/LG), harness side.
  
  Fig 1: Measuring Resistance Between ABS Module C135 Pin 18, Circuit 1827 (WH/LG), Harness Side And DLC C251 Pin 6, Circuit 1827 (WH/LG), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the ABS module C135 pin 28, circuit 1828 (PK/LG), harness side and the DLC C251 pin 14, circuit 1828 (PK/LG), harness side.
  
  Fig 2: Measuring Resistance Between ABS Module C135 Pin 28, Circuit 1828 (PK/LG), Harness Side And DLC C251 Pin 14, Circuit 1828 (PK/LG), Harness Side
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to A3.
- No : REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.
A3 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all the ABS module connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the ABS module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new ABS module. Refer to ANTI-LOCK CONTROL . CARRY OUT the diagnostic tool data link test.
- 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 self-test. CARRY OUT the diagnostic tool data link test.