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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0340, P0341 or P0342 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the engine running, observe the CMP Sensor parameter using the scan tool. The CMP Sensor speed should match the Engine Speed parameter within 100 RPM.
    • If the CMP Sensor speed is 0, continue with Circuit/System Testing.
  2. With the ignition ON and the engine OFF, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 0 RPM for both parameters. Change the maximum spec to 1,500 RPM for both parameters.
  3. Observe the scan tool and start the engine. The graphed lines should stay together.
    • If the CMP sensor line deviates excessively from the engine speed line, continue with Circuit/System Testing.
  4. With the engine running, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 3,000 RPM for both parameters.
  5. Observe the scan tool and operate the vehicle under 3,000 RPM within the Conditions for Running the DTC. The graphed lines should stay together.
    • If the CMP Sensor line deviates excessively from the engine speed line, continue with Circuit/System Testing.
  6. With the engine running, use the Live Plot function on the scan tool. Select the Engine Speed parameter and the CMP Sensor parameter. Change the minimum spec to 3,000 RPM for both parameters. Change the maximum spec to 5,500 RPM for both parameters.
  7. Observe the scan tool and operate the vehicle, between 3,000-5,500 RPM, within the Conditions for Running the DTC. The graphed lines should stay together.
    • If the CMP Sensor line deviates excessively from the engine speed line, continue with Circuit/System Testing.
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