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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 294 (Anti-Lock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information & Procedures >> DTC C0455 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  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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