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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0716 or P0717 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine and observe the Transmission ISS parameter on the scan tool. Measure the TCM voltage of the ISS reference circuit to ground. Wiggle the engine harness.
    • If the value measures near 12-volt, measure the voltage from the ISS 12-volt reference to the ISS low reference circuit.
    • If the value is other than 12-volt, test the ISS 12-volt reference for an open or a short to ground. If no condition found, replace TCM.
  2. Measure the voltage of the ISS 12-volt reference circuit to the ISS low reference circuit.
    • If the value is near 12-volt, connect the J 38522  variable signal generator to the ISS signal circuit
    • If the value is not 12-volt, check the ISS low reference circuit for an open or a short to voltage.
  3. Adjust the J 38522  to 12-volt, frequency to 300 Hz and Duty Cycle to 50 percent.
    • If the ISS RPM value is near 600 RPM, check the internal harness for an open, short to ground or a short to voltage.
    • If the ISS RPM value is not 600 RPM, check the ISS signal circuit for an open, short to ground or a short to voltage.
  4. Remove the AT ISS sensor. Refer to Oil Pump Disassemble .
    • If all circuit/connections test normal, test or replace the ISS.
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