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Home >> Isuzu >> 2008 >> Ascender LS, 4WD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System, Traction Control System & Stability Control System >> Diagnostic Information & Procedures >> DTC C0455 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the steering angle sensor.
  2. Wait for 60 seconds, test for less than 5Ω between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 5Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 7 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  6. Verify the scan tool Analog Steering Wheel Position Input parameter is less than 0.5 V.
    • If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the EBCM.
  7. Install a 3A fused jumper wire between the signal circuit terminal 6 and the 5 V reference circuit terminal 1. Verify the scan tool Analog Steering Wheel Position Input parameter is greater than 4.5 V.
    • If less than the specified range, test the signal circuit terminal for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  8. Verify the scan tool Digital SWPS Phase A parameter is High.
    • If not the specified parameter, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the EBCM.
  9. Install a 3A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase A parameter is Low.
    • If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.
  10. Verify the scan tool Digital SWPS Phase B parameter is High.
    • If not the specified parameter, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the EBCM.
  11. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase B parameter is Low.
    • If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.
  12. If all the circuits test normal, replace the steering angle sensor.
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