PSCM Circuit Information

Refer to the Power Steering Controls wiring diagrams for schematic and connector information. Refer to Steering GSB for additional connector and wiring inspection tips.

1. BF1: VERIFY STEERING TYPE 
   • This pinpoint test is applicable to EPAS vehicles only. It DOES NOT apply to HPAS vehicles equipped with an electric steering actuator.
   • Inspect the vehicle and determine if the steering system is EPAS or HPAS with an electric steering actuator.
     • The presence of a power steering pump, hydraulic hoses or tubes indicates a HPAS system.
   • Is this vehicle equipped with EPAS? 

     Yes	No
     Go to  BF2.	GO to PINPOINT TEST CC .

2. BF2: CHECK THE PSCM AND ABS MODULE SOFTWARE 
   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 the ABS module. 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.
   • Is the module software up to date? 
3. BF3: CHECK FOR PSCM DTCS C1B00:54 AND C1 B00:95 
   • Ignition ON, engine running.

   Carry out the PSCM self-test.

   • Note all DTCs present in the PSCM.
   • Is DTC C1 B00:54 or C1B00:95 currently present and active in the PSCM? 

     Yes	No
     GO to PINPOINT TEST P .	For all other PSCM C1B00:xx DTCs, Go to  BF4. If there are no C1B00:XX DTCs currently present and active in the PSCM, DISCONTINUE this pinpoint test and REFER to the PSCM DTC Chart for direction.

4. BF4: INSPECT THE EPAS WIRING HARNESS AND ELECTRICAL CONNECTORS 
   • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to the Jacking and Lifting article
   • Ignition OFF.
   • Using a good light source, thoroughly inspect the wire harness along the top of the EPAS gear for:
     • cut wires
     • pinched wires
     • broken wires
     • corrosion
5. BF5: CHECK THE PSCM FOR RETURNING DTCS 
6. BF6: DETERMINE DIAGNOSTIC DIRECTION 
   • Review the PSCM self-test results from the previous step.
   • Was DTC C1 B00:49 present in the PSCM? 

     Yes	No
     Go to  BF7.	For PSCM DTC C1B00:62, Go to  BF8. For all others, REFER to the PSCM DTC Chart.

7. BF7: CHECK THE PSCM FOR RETURNING C1B00:49 DTC 
   NOTE: To clear DTC C1B00:49, the vehicle must be driven straight ahead for 30 seconds at speeds greater than 50 km/h (30 mph).
8. BF8: CHECK THE PSCM FOR RETURNING C1B00:62 DTC