Pinpoint Test H : U0131:87

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Power Steering Controls for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the EPAS sends messages to the GWM over the HS-CAN2. The GWM sends these messages to the VDM over the HS-CAN2. If the VDM does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). For information on the messages sent to the VDM by the EPAS, go to the Network Message Chart. REFER to: Vehicle Dynamic Suspension - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
VDM U0131:87	Lost Communication With Power Steering Control Module "A": Missing Message	This DTC sets in continuous memory if any one of the following messages is missing: Steering wheel angle. This can be due to a EPAS module failure, a circuit failure on the HS-CAN or an excessive load on the network.

Possible Sources

H1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, carry out the Network Test.
Does the PSCM pass the Network Test?

Yes GO to H2

No DIAGNOSE the PSCM does not respond to the diagnostic scan tool. REFER to: Communications Network .

H2 CHECK THE PSCM (POWER STEERING CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, carry out the PSCM self-test.

Clear the Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, carry out the PSCM self-test.

Record the PSCM Diagnostic Trouble Codes (DTCs).

Is DTC U0131:87 retrieved again?

Yes

GO to H3

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

H3 REVIEW THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PSCM (POWER STEERING CONTROL MODULE) SELF-TEST
- Check the recorded Diagnostic Trouble Codes (DTCs) from the PSCM self-test.
Is DTC U3003:16 or U3003:17 present in the PSCM?

Yes If DTC U3003:16 is present, GO to Pinpoint Test A If DTC U3003:17 is present, GO to Pinpoint Test B

No GO to H4

H4 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE PSCM (POWER STEERING CONTROL MODULE)
- Using a diagnostic scan tool, carry out the PSCM self-test.
Are any Diagnostic Trouble Codes (DTCs) present in the PSCM?

Yes DIAGNOSE the PSCM Diagnostic Trouble Codes (DTCs). Refer to EPAS Guided Routine .

No GO to H5

H5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

Check the vehicle service history for recent service actions related to the PSCM or VDM. If recent service history is found:
- verify the correct replacement module was installed.
  - HVBOM may be used to verify correct part fitment.
- verify the configuration of replacement module was correct.
  - re-configure the module using as-built data if prior configuration is suspect.
- verify the module was not obtained from a like vehicle and installed into customer vehicle.
  - return the swapped module to source vehicle and obtain new replacement module.

Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes

GO to H6

No	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

H6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0131:XX SET IN OTHER MODULES

Using a diagnostic scan tool, carry out the self-test for all modules.

Is DTC U0131:xx set in 1 or more modules in addition to the PSCM?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no Technical Service Bulletins (TSBs) exist for this concern, INSTALL a new EPAS module. Refer to EPAS Guided Routine .