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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0234 >> Circuit/System Testing

Circuit/System Testing

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  1. Engine running, command the TC Vane Pos. Ctrl. Solenoid ON with a scan tool.
  2. Perform a snapshot of the engine TC data list while slowly increasing the engine speed to 1,700 RPM, and then back to idle. Refer to Scan Tool Snapshot Procedure .
  3. Plot the snapshot and verify that the MAP sensor parameter increases smoothly as the engine speed is increased, and decreases smoothly as the engine speed is returned to idle.
    • If the MAP parameter does not change smoothly or does not follow engine speed, inspect the turbocharger for debris, damage, or sticking vanes. Refer to Turbocharger Cleaning and Inspection .
  4. If the turbocharger tests normal, replace the MAP sensor.
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