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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P2544 To DTC P268A) >> DTC P2564 or P2565 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the TC vane position sensor.
  2. Ignition OFF, allow sufficient time for the control module to power down. This can be verified by a loss of communication between the control module and the scan tool.
  3. Ignition OFF, test for less than 5 ohms of resistance between the low reference B 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 control module.
  4. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
    • If less than the specified range, test the 5-volt reference circuit for a an open/high resistance. If the circuit tests normal, replace the control module.
  5. Verify the scan tool TC Vane Position Sensor parameter is less than 2 percent.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the control module.
  6. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal A. Verify the scan tool TC Vane Position Sensor parameter is greater than 98 percent.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
  7. If all circuits test normal, test the TC vane position sensor. Refer to Component Testing for instructions.
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