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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1661 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P1448 Top DTC P2510) >> DTC P20E2 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: 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 Ω on each low reference circuit between terminals B and ground.
    • If 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 X1 harness connector at the ECM.
  4. Test for less than 5 Ω between the signal circuit terminal A of the EGT sensor 1 and the corresponding terminal 69 X1 of the ECM.
    • If greater than the specified range, repair the open/high resistance in the circuit.
  5. Test for less than 5 Ω between the signal circuit terminal A of the EGT sensor 2 and the corresponding terminal 93 X1 of the ECM.
    • If greater than the specified range, repair the open/high resistance in the circuit.
  6. If all circuits test normal, test or replace the affected sensor.
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