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Home >> Chevrolet >> 2016 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U0074: Control Module Communication Powertrain Expansion CAN Bus Off Malfunction (Powertrain Expansion Bus) >> Circuit/System Testing >> Testing the Serial Data Circuits for a Short between the Circuits
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Testing the Serial Data Circuits for a Short between the Circuits

WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, all access doors closed, all vehicle systems OFF and all keys at least 3 meters (9.8 feet) away from vehicle. It may take up to 2 minutes for all vehicle systems to power down.
  2. Connect the harness connectors at the device that was previously disconnected.
  3. Disconnect the harness connectors with the powertrain high speed CAN serial data circuits at another device, in the direction of the circuit shorted together.
  4. Test for greater than 110 Ω between each pair of serial data circuits at the device connector that was just disconnected.
    • If each pair of serial data circuits is 110 Ω or greater 

      Replace the device that was disconnected.

    • If any pair of serial data circuits is less than 110 Ω 
  5. Repeat step 1 until one of the following conditions are isolated:
    • Serial data circuits shorted together between two devices or splice packs, if equipped.
    • Serial data circuits shorted together between a device and a terminating resistor.
    • A shorted terminating resistor.
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