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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 P20E2 >> Circuit/System Testing

Circuit/System Testing

    IMPORTANT: Perform the Repair Verification after completing the Circuit/System Testing.
  1. Ignition OFF, disconnect both harness connectors at EGT sensor 1 and sensor 2.
  2. Ignition OFF and scan tool disconnected for 90 seconds, Measure for a resistance of less than 5 ohms on each low reference circuit between terminals B and ground.
    • If the resistance is greater than the specified range, repair the open/high resistance on the affected circuit. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, disconnect the harness connector X1 at the ECM.
  4. Test for less than 5 ohms on each of the following signal circuits:
    • ECM X1 signal circuit terminal 69 to EGT sensor 1 terminal A
    • ECM X1 signal circuit terminal 93 to EGT sensor 2 terminal A
    • If the resistance is greater than the specified range, repair the open/high resistance on the affected circuit.
  5. If all circuits test normal, test or replace the affected sensor.
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