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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0335 To DTC P3449) >> DTC P0340 or P0341 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition OFF, inspect the engine wiring harness carrying the CMP sensor circuits for the following conditions:
    • Close routing of aftermarket electrical equipment
    • Close to solenoids, motors, and relays
    • Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference.
  2. Start the engine. Using the Live Plot function on the scan tool, select the CMP sensor parameter. Change the minimum spec to 400 and the maximum spec to 4,000 RPM. Select the CKP sensor parameter. Change the minimum spec to 600, and the maximum spec to 3,300 RPM.
  3. Observe the scan tool.
  4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate pass 3,200 RPM. The graphed lines on the live plot display should track together across the screen.
    • If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.
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