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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P2564 or P2565 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. With the TC vane position sensor disconnected, measure for a voltage of near 0 volts between the signal and the low reference circuits with a DMM.
    • If the voltage is more than 4.7 volts, test the signal circuit for a short to voltage or a faulty ECM.
    2. IMPORTANT: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis. Use the DMM to perform this test. Refer to the DMM User Manual for calibration procedure.
  2. With the ignition and all electrical accessories OFF, allow sufficient time for the control module to power down before taking a resistance measurement. Measure for a resistance of less than 5 ohms with a DMM connected between the low reference circuit and a good ground.
    • If the resistance is more than 5 ohms, test the low reference circuit for an open, high resistance, poor connection, or a faulty ECM.
  3. With the ignition ON and the engine OFF, measure for a range of 4.8-5.2 volts between the 5-volt reference and the low reference circuits.
    • If the voltage is less than 4.8 volts, test the 5-volt reference circuit for an open, high resistance, or a faulty ECM.
  4. Connect a fused 3-amp jumper wire between the signal and the 5-volt reference circuit, observing the TC Vane Position Sensor parameter for a value of 100 percent.
    • If the parameter does not increase to 100 percent, test the signal circuit for the following conditions:
      • An open
      • A short to ground
      • High resistance
      • A poor connection
      • A faulty ECM
  5. With the ignition OFF, remove the turbocharger vane position sensor. With a scan tool, observe the TC Vane Position parameter for a smooth decreasing value from 100-0 percent while slowly depressing the button on the end of sensor.
    • If the parameter does not smoothly decrease, replace the turbocharger vane position sensor.
    • If all circuits test OK, replace the faulty turbocharger vane position sensor.
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