Pinpoint Test A: No Communication With The ABS Module

WARNING: This page is about a different car, the 2004 Lincoln Aviator. 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 CIRCUITS 601 (LB/PK) AND 493 (BK/PK) FOR AN OPEN

Key in OFF position.
Disconnect: ABS Module C155.
Key in ON position.
Measure the voltage between the ABS module C155-4, circuit 601 (LB/PK), harness side and ground; and between the ABS module C155 -32, circuit 493 (BK/PK), harness side and ground.

Fig 1: Measuring Voltage
Courtesy of FORD MOTOR CO.
Are the voltages greater than 10 volts?

Yes

GO to A2.

REPAIR the circuit(s) in question. REPEAT the self-test.

A2 CHECK CIRCUIT 274 (BK/WH) FOR AN OPEN

Key in OFF position.
Measure the resistance between the ABS module C155-16, circuit 274 (BK/WH), CHECK the module harness side and ground.

Fig 2: Measuring Resistance
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Yes

CHECK the module communication network. REFER to MODULE COMMUNICATIONS NETWORK

REPAIR the circuit. REPEAT the self-test.