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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Test Step

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

Yes : GO to A2.
No : REPAIR the circuit(s) in question. TEST the system for normal operation.

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.