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Home >> Mitsubishi >> 1992 >> 3000GT SL, Standard >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic >> Testing & Diagnosis >> Code 21 (No Anti-Roll Control) >> Malfunction In Steering Wheel Angular Velocity Sensor Circuit

Malfunction In Steering Wheel Angular Velocity Sensor Circuit

  1. Check service data for steering wheel angular velocity sensor. See SERVICE DATA INSPECTION  under TESTING & DIAGNOSIS. If steering wheel angular velocity sensor service data test okay, go to next step. If steering wheel angular velocity sensor service data does not test okay, go to step 6).
  2. Raise and support front wheels. Place steering wheel in straight-ahead position. Select TOUR mode using ECS switch. Using Multi-Use Tester (MUT), enter a simulated vehicle speed of 62 MPH (100 KM/H). Refer to MUT manufacturer's instructions.
  3. Check service data indications for items No. 61, 62, 63 and 64 (actuator indications). See SERVICE DATA INSPECTION . All service data indications should be SOFT.
  4. While monitoring service data indication for item No. 61, turn steering wheel sharply clockwise or counterclockwise 90 degrees from straight-ahead position. Service data indication should switch from SOFT to MEDIUM or HARD, depending on speed steering wheel is turned. Service data indication should return to SOFT approximately one second after steering wheel is held stationary. Repeat this step for items No. 62, 63 and 64.
  5. If all service data indications respond as specified, ECS system is okay. If any service data indications do not respond as specified, replace ECS control unit.
  6. Disconnect steering wheel angular velocity sensor connector. See STEERING WHEEL ANGULAR VELOCITY SENSOR under REMOVAL & INSTALLATION.
  7. Turn ignition on. Measure voltage between ground and steering wheel angular velocity sensor harness connector terminals No. 2 (Green/Blue wire), 3 (Green/Black wire) and 4 (Green/Red wire). 5 volts should be present at each terminal.
  8. If specified voltage is present, go to next step. If specified voltage is not present, check wiring harness. Repair harness as necessary. If harness is okay, replace ECS control unit.
  9. Check for continuity between steering wheel angular velocity sensor harness connector terminal No. 1 (Black wire) and ground. If continuity is not present, go to next step. If continuity is present, go to step 12).
  10. Check for continuity between steering wheel angular velocity sensor harness connector terminal No. 1 (Black wire) and ECS control unit harness connector terminal No. 57 (Black wire). See Figure.
  11. If continuity is present, replace ECS control unit. If continuity is not present, repair Black wire between steering wheel angular velocity sensor and ECS harness connector.
  12. Replace steering wheel angular velocity sensor with a known good sensor, and recheck for Code 21. If Code 21 is reset, replace ECS control unit. If Code 21 does not reset, replace steering wheel angular velocity sensor.
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