PINPOINT TEST B : The ABS Module Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables .

B1 CHECK THE ABS MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: ABS module C135 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C135-1	Courtesy of FORD MOTOR COMPANY	Ground
C135-25	Courtesy of FORD MOTOR COMPANY	Ground
C135-35	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	GO to B2.
No	VERIFY the BJB fuses 52 (10A), 68 (30A) and 69 (60A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

B2 CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C135-13	Courtesy of FORD MOTOR COMPANY	Ground
C135-38	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes	GO to B3.
No	REPAIR the circuit. CONNECT the negative battery cable.

B3 CHECK THE HS-CAN CIRCUITS BETWEEN THE ABS MODULE AND THE DLC FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C135-26	Courtesy of FORD MOTOR COMPANY	C251-6
C135-14	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to B4.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

B4 CHECK FOR CORRECT ABS MODULE OPERATION

Ignition OFF.

Disconnect and inspect the ABS module connector and related in-line connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the ABS module connector and related in-line connectors. Make sure they seat and latch correctly.

Operate the system and determine the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) and Stability Control .
No	The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.