Pinpoint Test M: DTC U0131

Anti-Lock Control

Pinpoint Test M: DTC U0131

Normal Operation

- DTC U0131 (Lost Communication With Power Steering Control Module (VAPS)- this DTC sets in continuous memory and on-demand if the steering sensor message that should be received from the Power Steering Control Module (PSCM) is missing for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:

- PSCM (Power Steering Control Module)

- ABS module

PINPOINT TEST M : DTC U0131

M1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to M2.
No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

M2 CHECK THE COMMUNICATION NETWORK

- Using a scan tool, carry out a Network Test.

Does the PSCM (Power Steering Control Module) pass the network test?

Yes
GO to M3.
No
REFER to Information Bus.

M3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND PSCM (Power Steering Control Module) SELF-TESTS

- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.

- Enter the following diagnostic mode on the scan tool: Self Test- PSCM (Power Steering Control Module).

Is DTC B1676 (or U3003:16) or DTC U3003:17 recorded?

Yes
For ABS module DTC B1676, GO to Pinpoint Test A. Pinpoint Test A: DTC B1676

For PSCM (Power Steering Control Module) DTCs, REFER to Steering System - Hydraulic Power Assist Steering (HPAS).
No
GO to M4.

M4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.

- Ignition OFF.

- Wait 10 seconds.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.

Is DTC U0131 still present?

Yes
GO to M5.
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.

M5 CHECK FOR DTC U0131 SET IN OTHER MODULES

- Clear the DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC U0131 set in more than 1 module?

Yes
INSTALL a new PSCM (Power Steering Control Module). CLEAR the DTCs. REPEAT the ABS module self-test.
No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.