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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.

NOTE: Use the correct probe adapters when making measurements. Failure to use the correct probe adapters may cause damage to the connector.
  1. BD1: RECHECK THE PSCM DTCS 
    • Ignition ON, engine running.

    Carry out the PSCM self-test.

    • Is DTC U3001:xx present and active in the PSCM? 
      Yes No
      Go to  BD2. The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.
  2. BD2: CHECK THE VEHICLE BATTERY AND CHARGING SYSTEM VOLTAGE 
    • Ignition OFF.
    • Refer to the Battery, Mounting and Cables article and carry out Pinpoint Test A: Battery Condition Test (battery state of charge).
    • Did the battery pass the condition test (battery state of charge)? 
      Yes No
      Go to  BD3. INSTALL a new 12-volt battery.
      REFER to the Battery, Mounting and Cables article.
  3. BD3: CHECK THE PSCM VOLTAGE SUPPLY 
    • Ignition OFF.
    • Measure the voltage between:
      (+) Vehicle Battery (-) Vehicle Battery
      Positive terminal Negative terminal
    • Record the measured battery voltage.
  4. BD4: CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN 
    • Disconnect the battery negative cable. Refer to the Battery Disconnect General Procedure in the Battery, Mounting and Cables article.
    • Measure the resistance between:
  5. BD5: VERIFY PSCM WIRING HARNESS VOLTAGE CONNECTOR 
    • Using a good light source, inspect the PSCM electrical connectors for the following:
      • corrosion - install a new connector or terminal and clean the module pins.
      • damaged or bent pins - install new terminals or pins.
      • pushed-out pins - install new pins as necessary.
      • spread terminals - install new terminals as necessary.
  6. BD6: CHECK FOR CORRECT PSCM POWER AND GROUND JOINT OPERATION 
    • Ignition OFF.
    • Disconnect and inspect the PSCM ground joint connection, clean or repair as necessary. Refer to the Power Steering Controls wiring diagrams for ground joint information.
  7. BD7: VERIFY PSCM WIRING HARNESS POWER AND GROUND CIRCUIT OPERATION 
    • Ignition ON, engine running.
    • Make sure the front wheels are on the ground and the vehicle is not being supported by other means.
      • Make sure the front tires are clean and dry.
      • Make sure the ground under the front tires is clean and dry.
    • Take the following measurement while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.
    • Measure the voltage between:
      (+) Vehicle Battery (-) Vehicle Battery
      Positive terminal Negative terminal
    • Record the measured battery voltage.
    • View the following PID while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.
    • Access the PSCM and monitor the MOD_SUP_V (VOLT) PID.
    • Compare the measured battery voltage with the PID display.
    • Do the measured battery voltage and the PID display differ by more than 1.5 volts? 
      Yes No
      INSTALL a new PSCM wiring harness. Go to  BD8. The system is operating correctly at this time. The concern may have been caused by a loose or corroded PSCM electrical connector or a wiring harness in-line electrical connector and was repaired during this procedure.
  8. BD8: CHECK NEW PSCM WIRING HARNESS FOR INTERMITTENT POWER AND GROUND CIRCUIT OPERATION 
    • Ignition ON, engine running.
    • Make sure the front wheels are on the ground and the vehicle is not being supported by other means.
      • Make sure the front tires are clean and dry.
      • Make sure the ground under the front tires is clean and dry.
    • Take the following measurement while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.
    • Measure the voltage between:
      (+) Vehicle Battery (-) Vehicle Battery
      Positive terminal Negative terminal
    • Record the measured battery voltage.
    • View the following PID while turning the steering wheel back and forth, lock to lock, continuously at 1 revolution per second.
    • Access the PSCM and monitor the MOD_SUP_V (VOLT) PID.
    • Compare the measured battery voltage with the PID display.
    • Do the measured battery voltage and the PID display differ by more than 1.5 volts? 
      Yes No
      Go to  BD10. Go to  BD9.
  9. BD9: RECHECK THE PSCM DTCS 
    • Ignition ON, engine OFF.
    • Clear the PSCM DTCs.
    • Ignition OFF.
    • Wait at least 90 seconds for the modules to completely shut off.
    • Ignition ON, engine running.

    Carry out the PSCM self-test.

    • Is DTC U3001:xx present and active in the PSCM? 
      Yes No
      Go to  BD10. The repair is complete, no further action is required.
  10. BD10: CHECK FOR APPLICABLE SERVICE ARTICLES 
    • Ignition OFF.
    • Check OASIS for any applicable service messages; TSB, GSB, SSM or FSA.
    • Does a service article exist for PSCM DTC U3001:xx Control Module Improper Shutdown Performance? 
      Yes No
      DISCONTINUE this test and FOLLOW the service article instructions. REFER to the Charging System General Information article for further diagnosis of the charging system. The PSCM wiring harness, circuits and electrical connectors are NOT a root cause of DTC U3001. PSCM DTC U3001 does not require PSCM or EPAS replacement.
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