Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P2563 >> Circuit/System Testing

Circuit/System Testing

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.
  1. With the ignition OFF, disconnect the TC vane position sensor and the ECM. Measure for a resistance of less than 10 ohms between the TC vane position sensor signal, a 5-volt reference and low reference circuits, and the ECM.
    • If the resistance is over 10 ohms, repair the high resistance or poor connection in the faulty circuit.
    • If the resistance is less than 10 ohms, test the TC sensor.
  2. With the ignition OFF, remove the turbocharger vane position sensor. Connect the vane position connector and turn ON the ignition. With a scan tool, observe the TC Vane Position parameter while slowly depressing the button on the end of sensor. Verify a smooth decreasing percent value from 100-0 percent.
    • If the parameter does not decrease smoothly, replace the turbocharger vane position sensor.
  3. Inspect the turbocharger for debris, damage, or stuck. Refer to Turbocharger Cleaning and Inspection .
    • If all circuits, the turbocharger, and the TC vane position sensor test OK, replace the ECM.
scientia non olet · About Mike's Workshop Manuals