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Electronic Power Steering System - Variable Effort Steering: Other Oldsmobile Aurora II

Electronic Steering ~518 words

SYSTEM CHECK

  1. Install scan tool. Ensure scan tool powers up. If scan tool powers up, go to next step. If scan tool does not power up, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Start engine. Attempt to establish communications with EBCM. If scan tool communicates with EBCM, go to next step. If EBCM does not communicate with EBCM, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Select MagnaSteer Display DTC function on scan tool. If scan tool displays any DRP/ABS/TCS/VSES DTCs, go to appropriate ANTI-LOCK article in BRAKES. If scan tool does not display any DTC, go to next step.
  4. Select MagnaSteer Display DTC function on scan tool. If scan tool displays DTC C1241, go to «DIAGNOSTIC TESTS»(ref-99242-S15852379472001062900000) . If scan tool does not display DTC C1241, see SYSTEM TESTS in appropriate RACK & PINION article.

VES PROGRAMMING

  1. Connect scan tool. Input vehicle information and select CHASSIS. Scan tool will display DRP/ABS/TCS/VSES/VES/TIM, if equipped, MAGNASTEER and REAR INTEGRATION MODULE. Select MAGNASTEER.
  2. Scan tool will display DIAGNOSTICS and RECALIBRATION. Select RECALIBRATION.
  3. Scan tool will display MAGNASTEER RECALIBRATION PROCEDURE. Turn ignition on. Press ENTER. Scan tool will display IS VIN CORRECT? Ensure VIN number is correct and select YES.
  4. Scan tool will display DOES VEHICLE HAVE MAGNASTEER RPO NO. NV8? Select YES. Scan tool will display RECAL WITH FACTORY STANDARD RECALIBRATION? Select NO.
  5. Scan tool will display SELECT CALIBRATION. Choose MORE FIRM, FACTORY CALIBRATION or LESS FIRM. Scan tool will display MAGNASTEER RELCALIBRATION PROCEDURE IS COMPLETE. Press EXIT. Recalibration is complete.

HYDRAULIC SYSTEM BLEEDING

  1. Ensure hoses do not touch any part of vehicle and all connections tight. Remove pump reservoir cap. Fill pump reservoir with fluid to FULL COLD level. Attach Bleeding Adapter (J-43485) to vacuum pump. Connect adapter to pump reservoir opening. Apply 20 in Hg of vacuum. Wait 5 minutes. Typical vacuum drop is 2-3 in Hg.
  2. Reinstall pump reservoir cap. Start engine. Allow engine to idle. Turn off engine. Allow fluid to stabilize. DO NOT turn steering wheel to lock position. Start engine. Allow engine to idle. Turn steering wheel 180-360 degrees in both directions 5 times. Turn ignition off. Check fluid level. Repeat step 1 .
  3. If vacuum drop is excessive, pump is probably damaged. Check power steering pump and steering system. See appropriate base power steering article.
  4. Observe fluid. If condition continues, replace following parts: Return hose clamps Return hose "O" rings. Pressure hose "O" rings. Gear cylinder line "O" rings. Reservoir pump "O" ring. Repeat bleed procedure from beginning. Drive vehicle approximately 10 mile to warm system to operating temperature. Evaluate vehicle on smooth flat surface. Verify following conditions: There is smooth power assist. The vehicle operates quietly. The pump maintains proper fluid level. There is no leaking in steering system. The fluid is free of foam or discoloration.

POWER STEERING PUMP BELT

Note. See ADJUSTMENTS in appropriate POWER RACK & PINION article.

VARIABLE EFFORT STEERING (VES) ACTUATOR

VES actuator is located in steering gear pinon and valve assembly. See appropriate POWER RACK & PINION article for removal and installation.

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