Pinpoint Test A : The Pcm Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2018 Lincoln MKT. 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 .

A1 VERIFY WHETHER OTHER HS-CAN MODULES PASS THE NETWORK TEST

Using a scan tool, perform the network test.

In the LH pane of the IDS network test display screen, verify whether any HS-CAN modules passed the network test.

Is the text "pass" or a DTC listed next to any of the following modules (if equipped): ABS module, APIM, C-CM, HUD module, HCM, IPC, IPM-A, OCSM, PAM, PCM, PSCM, RCM, SCCM or VDM ?

Yes	If "pass" or a DTC was listed next to the PCM, a network fault is not currently present. If "pass" or a DTC was listed next to one or more modules other than the PCM, GO to A2.
No	No modules are currently communicating on the HS-CAN. GO to Pinpoint Test AG to diagnose no HS-CAN communication.

A2 PINPOINT TEST QA VERIFICATION

Verify that PINPOINT TESTS QA: UNABLE TO ACTIVATE SELF-TEST/NETWORK COMMUNICATION ERROR has been carried out.

Has pinpoint test QA been carried out?

Yes	GO to A3.
No	REFER to the PINPOINT TESTS QA: UNABLE TO ACTIVATE SELF-TEST/NETWORK COMMUNICATION ERROR to diagnose no communication with the PCM.

A3 CHECK THE HS-CAN TERMINATION RESISTANCE

Ignition OFF.

Disconnect: Negative Battery Cable.

Disconnect the scan tool from the DLC.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C251-6	VDB04 (WH/BU)	C251-14	VDB05 (WH)

Courtesy of FORD MOTOR COMPANY

Is the resistance between 54 and 66 ohms?

Yes	GO to A6.
No	For 3.7L Ti-VCT engine, GO to A4. For 2.0L/3.5L GTDI engine, GO to A5.

A4 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 3.7L Ti-VCT

Disconnect: PCM C175B .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C175B-59	VDB04 (WH/BU)	C251-6	VDB04 (WH/BU)
C175B-58	VDB05 (WH)	C251-14	VDB05 (WH)

Courtesy of FORD MOTOR COMPANY

Are the resistances less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to A6.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

A5 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 2.0L/3.5L GTDI

Disconnect: PCM C1381B .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C1381B-69	VDB04 (WH/BU)	C251-6	VDB04 (WH/BU)
C1381B-68	VDB05 (WH)	C251-14	VDB05 (WH)

Courtesy of FORD MOTOR COMPANY

Are the resistances less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to A6.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

A6 CHECK FOR CORRECT PCM OPERATION

Disconnect and inspect the PCM connectors.

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

Connect all the PCM connectors and make sure they seat 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 PCM. REFER to Electronic Engine Controls .
No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.