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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the FTP sensor.
  2. Ignition OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 5 Ω of resistance between the low reference circuit terminal A or 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 K20 engine control module.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal C or 3 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 K20 engine control module.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  4. Verify the scan tool FTP sensor parameter is less than 0.1 V.
    • If greater than the specified range, test the signal circuit terminal B or 1 for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  5. Install a 3A fused jumper wire between the signal circuit terminal B or 1 and the 5 V reference circuit terminal C or 3. Verify the scan tool FTP sensor parameter is greater than 4.7 V.
    • If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If all circuits test normal, test or replace the B150 fuel tank pressure sensor.
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