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Home >> Chevrolet >> 2009 >> Chevy Express G2500, Van Cargo Extended, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - DTC P1224 To DTC P2463 >> DTC P2032 or P2033 >> Circuit/System Testing

Circuit/System Testing

    IMPORTANT: Perform the Repair Verification after performing the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the EGT sensor 2.
  2. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool EGT Sensor 2 parameter is greater than 998°C (1,828°F).
    • If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference terminal B. Verify the scan tool EGT 2 parameter is less than -35°C (-31°F).
    • If warmer than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the EGT sensor.
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