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. CC1: VERIFY STEERING TYPE 
   • This pinpoint test is applicable to HPAS vehicles equipped with an electric steering actuator only. It DOES NOT apply to EPAS vehicles.
   • 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 HPAS and an electric steering actuator? 

     Yes	No
     Go to  CC2.	GO to PINPOINT TEST BF .

2. CC2: CHECK FOR PSCM DTCS U0121:00 OR U0415:00 
   • Ignition ON, engine running.
   • Drive the vehicle above 20 km/h (12 mph) for at least 5 minutes.

   Carry out the PSCM self-test.

   • Is DTC U0121:00 or U0415:00 currently present and active in the PSCM? 

     Yes	No
     For DTC U0415, GO to PINPOINT TEST AT . For DTC U0121, GO to PINPOINT TEST AK .	Go to  CC3.

3. CC3: 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 electronic steering actuator wire harness for:
     • cut wires
     • pinched wires
     • broken wires
     • corrosion
4. CC4: CHECK THE PSCM FOR RETURNING DTCS