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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 936 (Engine Controls And Fuel - 6.6L (LMM) - DTC P02E0 To DTC P154A) >> DTC P0698 or P0699 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn OFF the ignition for 60 seconds or until the ECM powers down.
  2. Disconnect the accelerator pedal position (APP) sensor.
  3. Turn ON the ignition, with engine OFF and measure the voltage from the 5-volt reference circuit of the APP sensor 1 to a good ground with a DMM.
    • If the voltage measures 4.7-5.2 volts, replace the APP sensor.
  4. With the DMM still connected to the 5-volt reference circuit, disconnect all other components connected to the 5-volt reference 3, one at a time. Refer to Diagnostic Fault Information .
    • If voltage changes when one of the above components is disconnected, replace the component. Refer to the appropriate replacement procedure.
  5. Test the 5-volt reference 3 circuits for a short to ground or a short to voltage.
    • If no problem was found in the 5-volt reference 3 circuit, replace the ECM.
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