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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (P0351 - P2635)) >> Diagnostic Information And Procedures >> DTC P15A1: Fuel Economy Mode Switch Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the S126 drive mode select switch.
    2. NOTE:

    It may take up to 2 minutes for all vehicle systems to power down.

  2. Ignition OFF and all vehicle systems OFF, test for less than 5 Ω between ground circuit terminal 10 of the harness connector and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.
  3. Ignition ON, test for 4.8 - 5.2 V between 5 V reference circuit terminal 9 of the harness connector and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, test for 0.050 - 0.250 V between signal circuit terminal 7 of the harness connector and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, test or replace the S126 drive mode select switch.
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