Pinpoint Test A: The Pcm (Powertrain Control Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2023 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information. Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.
Normal Operation and Fault Conditions

The PCM communicates on the HS-CAN1.

Possible Sources
- Fuse
- Wiring, terminals and connectors
- PCM

A1 VERIFY WHETHER OTHER HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) MODULES PASS THE NETWORK TEST

Using a diagnostic scan tool, the network test.

Is the text "pass" or a DTC listed next to any of the following modules (if equipped): APIM, BCM, ICM, PAM, or PCM?

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-CAN1. GO to Pinpoint Test AE

A2 ENGINE CONTROLS ARTICLE PINPOINT TEST QA VERIFICATION CHECK
- Verify Engine Controls article pinpoint test QA has been completed.
Has pinpoint test QA been completed?

Yes GO to A3

No

A3 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) TERMINATION RESISTANCE

Ignition OFF.

Disconnect GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-20	Courtesy of FORD MOTOR COMPANY	C2431-19

Is the resistance between 108 and 132 ohms?

Yes

GO to A5

GO to A4

A4 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE PCM (POWERTRAIN CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect PCM C1551B 2.3L, C175B 5.0L,

Measure:

2.3L

Positive Lead	Measurement / Action	Negative Lead
C1551B-67	Courtesy of FORD MOTOR COMPANY	C2431-20
C1551B-66	Courtesy of FORD MOTOR COMPANY	C2431-19

5.0L

Positive Lead	Measurement / Action	Negative Lead
C175B-27	Courtesy of FORD MOTOR COMPANY	C2431-20
C175B-12	Courtesy of FORD MOTOR COMPANY	C2431-19

Positive Lead	Measurement / Action	Negative Lead
C1381B-75	Courtesy of FORD MOTOR COMPANY	C2431-20
C1381B-76	Courtesy of FORD MOTOR COMPANY	C2431-19

GT500

Positive Lead	Measurement / Action	Negative Lead
C1232B-27	Courtesy of FORD MOTOR COMPANY	C2431-20
C1232B-12	Courtesy of FORD MOTOR COMPANY	C2431-19

Are the resistances less than 3 ohms?

Yes

GO to A5

No	REPAIR the circuit in question.

A5 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the PCM 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 PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PCM. Refer to the appropriate Removal and Installation procedure in the appropriate Electronic Engine Controls service information.

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.