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

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 THE VOLTAGE TO THE ABS MODULE

Key in OFF position.
Disconnect: ABS Module C135.
Key in ON position.

Measure the voltage between ABS module C135 pins, harness side and ground as follows:

VOLTAGE SPECIFICATION

Connector-Pin	Circuit
C135-1	534 (YE/LG)
C135-4	533 (TN/RD)
C135-32	532 (OG/YE)

Are the voltages greater than 10 volts?

Yes: Go to A2.

No: VERIFY central junction box (CJB) fuse 103 (30A), fuse 112 (30A) and fuse 16 (10A) are OK. If OK, REPAIR the circuit in question. TEST the system for normal operation.

A2 CHECK THE ABS MODULE GROUNDS
- Key in OFF position.
- Measure the resistance between ABS module C135-16, circuit 530 (LG/YE), harness side and ground; and between ABS module C135-47, circuit 530 (LG/YE), harness side and ground.
  
  Fig 1: Checking ABS Module Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes: CHECK the module communication network. REFER to COMMUNICATIONS NETWORK .

No: REPAIR the circuit. TEST the system for normal operation.