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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 P0090 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Failure to allow the ECM communications to completely terminate with the scan tool may result in misdiagnosis.

If DTC U0105, P0087, or P0088 are also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

  1. Turn OFF the ignition for 30 seconds or until the ECM is powered down.
  2. Disconnect the FRP regulator in-line connector.
  3. Probe the solenoid control circuit terminal 2 with a test lamp connected to ground. The test lamp should not illuminate.
      IMPORTANT: A solenoid control circuit that is shorted to voltage will illuminate the test lamp on both the supply voltage circuit and the solenoid control circuit.
    • If the test lamp illuminates, test the solenoid control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Turn On the ignition.
  5. Connect the test lamp between the solenoid supply voltage circuit, terminal 1 and a ground. The test lamp should illuminate.
    • If the test lamp did not illuminate, test the solenoid supply voltage circuit for an open. If the circuit tests normal, replace the ECM.
  6. Connect the test lamp between the solenoid supply voltage circuit, terminal 1 and the solenoid control circuit, terminal 2. The test lamp should illuminate.
    • If the test lamp did not illuminate, test the solenoid control circuit for an open. If the circuit tests normal, replace the ECM.
  7. Test the harness between the inline connector and the FRP regulator for an open or short to voltage. If the circuits tests normal, replace the FRP regulator.
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