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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 321 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P3052, P3054, or P3056: DC/DC Converter Actuator >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Use schematics to determine which devices are powered up on the T19 Power Supply Transformer B+ supply circuit terminal 10 X1.

  1. Ignition OFF, measure and record the battery voltage at the battery terminals.
  2. Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
    • If battery voltage is between 12.4 and 12.8 V 
  3. Verify ECM ground is clean and tight.
  4. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.
  5. Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.
    • If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V. 

      Refer to Charging System Test .

    • If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V. 
  6. Ignition ON.
  7. Verify that the appropriate devices controlled by the T19 Power Supply Transformer control circuit terminal 10 X1 turn ON when cycling the ignition ON.
    • If the devices do not turn ON 

      Refer to Circuit/System Testing.

    • If the devices turn ON 
  8. Verify DTC P3052, P3054 or P3056 does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  9. All OK.
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