PINPOINT TEST A : The PCM 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 .

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

Using a diagnostic scan tool, perform a network test.

Is the text "pass" or a DTC listed next to any of the following modules (if equipped): APIM, ABS module, BCM, HCM, IPC, PAM, PSCM, PCM, RCM, SCCM, TBC module, TCCM 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 AE .

A2 PC/ED ARTICLE PINPOINT TEST QA VERIFICATION CHECK

Verify that PC/ED article pinpoint test QA has been carried out.

Has pinpoint test QA been carried out?

Yes	GO to A3.
No	REFER to Engine Controls - Pinpoint Tests (Except Diesel & Hybrid) , pinpoint test QA to diagnose no communication with the PCM.

A3 CHECK THE HS-CAN TERMINATION RESISTANCE

Ignition OFF.

Measure:

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

Is the resistance between 54 and 66 ohms?

Yes	CONNECT the negative battery cable. GO to A5.
No	GO to A4.

A4 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN

Disconnect: PCM C175B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C175B-69	Courtesy of FORD MOTOR COMPANY	C251-6
C175B-68	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes	GO to A5.
No	REPAIR the circuit in question. CONNECT the negative battery cable.

A5 CHECK FOR CORRECT PCM OPERATION

Ignition OFF.

Disconnect and inspect the PCM 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 PCM 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 PCM. REFER to Electronic Engine Controls .
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.