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Home >> Chevrolet >> 2008 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> DTC P0608 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: The drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to Lifting and Jacking the Vehicle .
  1. Ignition OFF, disconnect the harness connector at the rear object sensor control module.
  2. With the drive wheels raised start the engine and place the vehicle transmission in drive or the first gear. Verify that the speedometer value does not match the scan tool Vehicle Speed parameter in the ECM Engine Data List.
    • If the speedometer matches the scan tool Vehicle Speed parameter, test the vehicle speed signal circuit terminal 18 for a short to voltage, a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object sensor control module.
  3. Ignition OFF disconnect the X1 harness connector at the engine control module.
  4. Ignition ON, test for 9-11 volts between the vehicle speed signal circuit terminal 39 and ground.
    • If less than 9 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than 11 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  5. If all circuits test normal, test or replace the ECM.
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