PINPOINT TEST S : The APIM Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 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 .

S1 CHECK THE APIM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: APIM C3342A or C2383A (touchscreen display).

Ignition ON.

Measure:

4.2-inch display

Positive Lead	Measurement / Action	Negative Lead
C3342A-1	Courtesy of FORD MOTOR COMPANY	Ground

Touchscreen display

Positive Lead	Measurement / Action	Negative Lead
C2383A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to S2.
No	VERIFY the BCM fuse 9 (10A) 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.

S2 CHECK THE APIM GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure:

4.2-inch display

Positive Lead	Measurement / Action	Negative Lead
C3342A-37	Courtesy of FORD MOTOR COMPANY	Ground
C3342A-38	Courtesy of FORD MOTOR COMPANY	Ground

Touchscreen display

Positive Lead	Measurement / Action	Negative Lead
C2383A-37	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	GO to S3.
No	REPAIR the circuit.

S3 CHECK THE HS-CAN CIRCUITS BETWEEN THE APIM AND THE DLC FOR AN OPEN

Measure:

4.2-inch display

Positive Lead	Measurement / Action	Negative Lead
C3342A-53	Courtesy of FORD MOTOR COMPANY	C251-6
C3342A-54	Courtesy of FORD MOTOR COMPANY	C251-14

Touchscreen display

Positive Lead	Measurement / Action	Negative Lead
C2383A-53	Courtesy of FORD MOTOR COMPANY	C251-6
C2383A-54	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes	GO to S4.
No	REPAIR the circuit in question.

S4 CHECK THE I-CAN CIRCUITS BETWEEN THE APIM AND THE IPC FOR AN OPEN

Disconnect: IPC C220 .

Measure:

4.2-inch display

Positive Lead	Measurement / Action	Negative Lead
C3342A-16	Courtesy of FORD MOTOR COMPANY	C220-12
C3342A-17	Courtesy of FORD MOTOR COMPANY	C220-13

Touchscreen display

Positive Lead	Measurement / Action	Negative Lead
C2383A-19	Courtesy of FORD MOTOR COMPANY	C220-25
C2383A-20	Courtesy of FORD MOTOR COMPANY	C220-26

Are the resistances less than 3 ohms?

Yes	CONNECT the IPC. If the vehicle is equipped with a touchscreen display, GO to S5.If the vehicle is not equipped with a touchscreen display, CONNECT the negative battery cable. GO to S6.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

S5 CHECK THE MS-CAN CIRCUITS BETWEEN THE APIM AND THE DLC FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-16	Courtesy of FORD MOTOR COMPANY	C251-3
C2383A-17	Courtesy of FORD MOTOR COMPANY	C251-11

Are the resistances less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to S6.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

S6 CHECK FOR CORRECT APIM OPERATION

Ignition OFF.

Disconnect and inspect the APIM 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 APIM 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, APIM Hardware Testing .
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.