PINPOINT TEST K : The ACM 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 .

K1 VERIFY VEHICLE EQUIPMENT - SYNC SYSTEM
- Verify the vehicle is equipped with the SYNC system.
Is the vehicle equipped with SYNC?

Yes GO to K2.

No GO to K4.

K2 CHECK THE I-CAN TERMINATION RESISTANCE

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C251-1	Courtesy of FORD MOTOR COMPANY	C251-9

Is the resistance between 54 and 66 ohms?

Yes	GO to K5.
No	GO to K3.

K3 CHECK THE I-CAN CIRCUITS BETWEEN THE ACM AND THE IPC FOR AN OPEN

Disconnect: ACM C290A (SYNC without touchscreen) C240A (SYNC with touchscreen).

Disconnect: IPC C220 .

Measure:

Mid-level IPC, SYNC without touchscreen

Positive Lead	Measurement / Action	Negative Lead
C290A-15	Courtesy of FORD MOTOR COMPANY	C220-12
C290A-16	Courtesy of FORD MOTOR COMPANY	C220-13

Mid-level IPC, SYNC with touchscreen

Positive Lead	Measurement / Action	Negative Lead
C240A-14	Courtesy of FORD MOTOR COMPANY	C220-12
C240A-15	Courtesy of FORD MOTOR COMPANY	C220-13

High level IPC

Positive Lead	Measurement / Action	Negative Lead
C240A-14	Courtesy of FORD MOTOR COMPANY	C220-25
C240A-15	Courtesy of FORD MOTOR COMPANY	C220-26

Are the resistances less than 3 ohms?

Yes	GO to K5.
No	REPAIR the circuit in question.

K4 CHECK THE MS-CAN CIRCUITS BETWEEN THE ACM AND THE DLC FOR AN OPEN

Disconnect: ACM C290B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C290B-15	Courtesy of FORD MOTOR COMPANY	C251-3
C290B-16	Courtesy of FORD MOTOR COMPANY	C251-11

Are the resistances less than 3 ohms?

Yes	GO to K5.
No	REPAIR the circuit in question.

K5 CHECK THE ACM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Connect: Negative Battery Cable.

Disconnect: ACM C290A (without touchscreen) or C240A (with touchscreen).

Ignition ON.

Measure:

Without touchscreen

Positive Lead	Measurement / Action	Negative Lead
C290A-1	Courtesy of FORD MOTOR COMPANY	Ground

With touchscreen

Positive Lead	Measurement / Action	Negative Lead
C240A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to K6.
No	VERIFY the BCM fuse 29 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

K6 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure:

Without touchscreen

Positive Lead	Measurement / Action	Negative Lead
C290A-13	Courtesy of FORD MOTOR COMPANY	Ground

With touchscreen

Positive Lead	Measurement / Action	Negative Lead
C240A-13	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to K7.
No	REPAIR the circuit.

K7 CHECK FOR CORRECT ACM OPERATION

Ignition OFF.

Disconnect and inspect the ACM connectors and related in-line connectors.

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

Reconnect the ACM connectors and related in-line connectors. Make sure they seat and latch correctly.

Operate the system and verify 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 ACM. Refer to the appropriate Information and Entertainment Systems article for the procedure.
No	The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.

Yes	GO to K2.
No	GO to K4.