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

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

A1 CHECK CIRCUIT 677 (LB) AND CIRCUIT 483 (RD) FOR AN OPEN
- Key in OFF position.
- For vehicles equipped with a 3.0L engine , with the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
- Disconnect: ABS Module C155.
- Key in ON position.
- Measure the voltage between ABS module C155-4, circuit 677 (LB), harness side and ground; and between ABS module C155-32, circuit 483 (RD), harness side and ground.
  
  Fig 1: Checking Circuit 677 (LB) & Circuit 483 (RD) For An Open
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
Yes: GO to A2.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
A2 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between ABS module C155-16, circuit 570 (BK/WH) harness side and ground.
  
  Fig 2: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: CHECK the module communications network. REFER to MODULE COMMUNICATIONS NETWORK .

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.