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Pinpoint Test W: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) C102D High Friction Inside Power Steering

  1. NOTE: Refer to Steering GSB for additional connector and wiring inspection tips.

    Refer to Power Steering Controls for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Power Steering - System Operation and Component Description .

    Description 

    • Description 
    • The PSCM continuously monitors different vehicle parameters in order to detect high friction. If the calculated friction value exceeds a predetermined threshold a message is displayed in the message center.

    Pinpoint Test Applicability 

    • Pinpoint Test Applicability 
    • This test applies to PSCMDTC C102D High Friction Inside Power Steering only. It does not apply to any other module except the PSCM.

    DTC Diagnostic Strategy 

    • DTC Diagnostic Strategy 
    • If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults.

    Pinpoint Test Purpose 

    • Pinpoint Test Purpose 
    • This test verifies the presence of PSCMDTC C102D and determines if the cause is mechanical or electrical in nature.

    Diagnostic Aids 

    • Diagnostic Aids 
    • If DTC C102D sets, steering assist is unaffected during the current drive cycle but steering assist is removed starting at the next ignition cycle. Message center displays STEERING LOSS STOP SAFELY.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PSCM C102D:00 High Friction Inside Power Steering: No Sub Type Information Sets if high friction is detected inside the steering gear.

    Possible Causes 

    • Steering gear internal failure

  2. W1 CHECK AND RECORD THE LEFT FRONT AND RIGHT FRONT TIRE PRESSURES

    • Check and record the left front and right front tire pressures.

    • Compare the recorded tire pressure readings with the information on the VC label.

    Is the air pressure in the tires correct as indicated on the VC label? 

    Yes  GO to  W2
    No  ADJUST the air pressure in the tires. GO to  W2

  3. W2 CHECK FOR UNLOADED STEERING SYSTEM TRAVEL FEEL

    • With the transmission in NEUTRAL, position the vehicle on a hoist. REFER to: Jacking and Lifting .

    • Ignition OFF.

    • Rotate the steering wheel from lock-to-lock and inspect the steering system travel for the following:

      • Abnormal noises
      • Rough spots
      • Sticky spots
      • Tight spots

    Is steering rack travel smooth and free of any abnormal noises, rough, sticky and tight spots? 

    Yes  GO to  W3
    No  GO to  W4

  4. W3 VERIFY THE STEERING SYSTEM TRAVEL FEEL

    • Using a scan tool, clear the PSCM Diagnostic Trouble Codes (DTC's).

    • Ignition OFF.

    • Wait at least 90 seconds for all modules to shut down.

    • Start the engine.

    • Drive the vehicle and verify the steering system travel for the following:

      • Abnormal noises
      • Rough spots
      • Sticky spots
      • Tight spots

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

    Does PSCMDTC C102D:xx return? 

    Yes  GO to  W4
    No  The concern was most likely due to low or uneven tire pressures. The repair is complete, RETURN the vehicle

  5. W4 CHECK FOR UNLOADED STEERING RACK TRAVEL FEEL

    • With the transmission in NEUTRAL, position the vehicle on a hoist. REFER to: Jacking and Lifting .

    • Ignition OFF.

    • Disconnect the outer tie rods from the wheel knuckles. REFER to: Tie Rod End .

    • Rotate the steering wheel from lock-to-lock and inspect the steering rack travel for the following:

      • Abnormal noises
      • Rough spots
      • Sticky spots
      • Tight spots

    Is steering rack travel smooth and free of any abnormal noises, rough, sticky and tight spots? 

    Yes  The condition may be caused by tires, wheel knuckles, ball joints, struts or damaged sub-frame. ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. DRIVE the vehicle to VERIFY the repair.
    No  GO to  W5

  6. W5 INSPECT THE INNER TIE RODS AND STEERING RACK FOR CORROSION

    • Remove the outer tie rod and bellows boot. REFER to: Tie Rod .

    • The following inspection must be carried out on BOTH sides of the steering rack:

      • Turn the steering wheel in one direction all the way until it stops to expose the steering rack.
      • Inspect the rack, inner tie rod and gear housing for rust, moisture, corrosion and other signs of harmful contamination.

    Is the rack, inner tie rod and gear housing free of moisture, rust, corrosion and other harmful contamination? 

    Yes  Using a diagnostic scan tool, CLEAR the PSCM Diagnostic Trouble Codes (DTCs). GO to  W6
    No  GO to  W8

  7. W6 CHECK FOR UNLOADED STEERING COLUMN FEEL

    NOTE: Do not allow the steering column to rotate more than 1 complete revolution in each direction. If the steering column shaft is allowed to rotate more than 1 complete revolution in each direction damage to the clockspring may occur.

    • Disconnect the steering column intermediate shaft from the steering gear and Discard the bolt.

    • Rotate the steering wheel 1 complete revolution in each direction and inspect the steering column travel for the following:

      • Abnormal noises
      • Rough spots
      • Sticky spots
      • Tight spots

    • Using a suitable steering wheel holding device, hold the steering wheel in the straight ahead position.

    Is steering column travel smooth and free of any abnormal noises, rough, sticky and tight spots? 

    Yes  GO to  W8
    No  GO to  W7

  8. W7 INSPECT THE STEERING COLUMN SHAFT U-JOINTS

    NOTE: Do not allow the steering column to rotate while the steering column shaft is disconnected or damage to the clockspring may result. If there is evidence that the steering column shaft has rotated, the clockspring must be removed and re centered. For additional information, refer to Clockspring for removal and installation.
    NOTE: When installing new bellows boots and clamps, apply new lubricant as instructed to prevent water contamination or damage may result to the EPAS gear.

    • Inspect the steering column shaft U-joints for looseness or wear.

    Are the steering column shaft U-joints okay? 

    Yes  INSTALL a new Steering Gear Bellows Boots. REFER to: Steering Gear Boot . CONNECT the steering column shaft to the EPAS gear. INSTALL a new bolt and TIGHTEN to 25 Nm (18 lb-ft). ADJUST the front toe setting. REFER to: Front Toe Adjustment .
    REFER to appropriate Suspension System service information to DIAGNOSE further possible causes.
    No  INSTALL a new steering column shaft assembly. REFER to: Steering Column .

  9. W8 CHECK FOR SPECIAL SERVICE MESSAGES

    • Check OASIS for any applicable TSB, GSB, SSM or FSA.

    Does a service article exists for this concern? 

    Yes  DISCONTINUE this test and FOLLOW the service article instructions.
    No  INSTALL a new EPAS gear. REFER to: Steering Gear .
    INSTALL a new Power Steering Control Module (PSCM). Only available in the on-line service information RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry 
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