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DTC P06E4

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P06E4 00: Control Module Wake-Up Circuit Performance

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Accessory Wake Up Serial Data 2

P06E4, U0100-U02FF*

U0100-U02FF

U0100-U02FF

--

* Vehicle will not start.

Circuit/System Description

The accessory wake-up serial data 2 circuit is energised by the hybrid powertrain control module 2 to immediately activate other control modules connected to this circuit when the body control module (BCM) signals the powertrain control module 2 that serial data is required.

Depending on the option content, control modules that may receive the wake-up signal are as follows:

    • 14 V Power Module
    • Battery Charger
    • Battery Energy Control Module (BECM)
    • Electronic Brake Control Module (EBCM)
    • A/C Compressor
    • Transmission Control Module (TCM)
    • Engine Control Module (ECM)
    • Power Inverter Module

Conditions for Running the DTC
    • The system voltage is between 9–16 V.
    • The vehicle power mode master requires serial data communication to occur.
    • The hybrid powertrain control module 2 attempts to wake up the control modules connected to its control module output wake-up circuit.

Conditions for Setting the DTC

The hybrid powertrain control module 2 detects a fault in the control module output wake-up circuit.

Action Taken When the DTC Sets
    • The DTC P06E4 is a type A DTC.
    • The control modules is never signaled; therefore the specific subsystems will not function.
    • The vehicle will not start while the circuit is shorted to ground.
    • The MIL will illuminate, along with several DIC messages.

Conditions for Clearing the DTC
    • The DTC P06E4 is a type A DTC.
    • A current DTC clears when the malfunction is no longer present.
    • A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

Short-circuit to earth will also set multiple no communication codes for high-speed GMLAN control modules.

Reference Information

Schematic Reference

    •  Data Communication Schematics
    •  Control Module References

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

    Note: Use the schematic to identify the following:

       • The control modules that share the K114B hybrid powertrain control module 2 terminal 69 X2 accessory wake-up serial data 2 circuit
       • The control module B+, ignition, earth, accessory wake-up serial data 2 circuit terminals

  1. Vehicle OFF, disconnect the X2 harness connectors at the K114B hybrid powertrain control module 2.
  2. Vehicle OFF, and all vehicle systems OFF, all keys at least 3 metres away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for greater than 100 Ω, but less than infinite resistance, between the accessory wake-up serial data 2 circuit terminal 69 X2 and earth.
    3. ⇒If less than the specified range, refer to Testing the Accessory Wake Up Serial Data 2 Circuits for a Short-Circuit to Earth.
    ⇒If infinite resistance, test the accessory wake-up serial data 2 circuit for an open-circuit/high resistance.
  3. Vehicle in Service Mode, verify that a test lamp illuminates between each B+ circuit terminal and earth.
    4. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the K114B hybrid powertrain control module 2.
  4. Vehicle in Service Mode, verify that a test lamp illuminates between each ignition circuit terminal and earth.
    5. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the K114B hybrid powertrain control module 2.
  5. If the circuits test normal, replace the K114B hybrid powertrain control module 2.

Testing the Accessory Wake-Up Serial Data 2 Circuits for a Short-Circuit to Earth

  1. Vehicle OFF, disconnect the X2 harness connector at the A4 hybrid/EV battery pack.
  2. Vehicle OFF, and all vehicle systems OFF, all keys at least 3 metres away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 100 Ω between the K114B hybrid powertrain control module 2 accessory wake-up serial data 2 circuit terminal 69 X2 and earth.
    3. ⇒If greater than the specified range, replace the A4 hybrid/EV battery pack.
  3. Vehicle OFF, disconnect the harness connector at an easily accessible control module that shares the K114B hybrid powertrain control module 2 terminal 69 X2 accessory wake-up serial data 2 circuit.
  4. Vehicle OFF, and all vehicle systems OFF, all keys at least 3 metres away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 100 Ω between the K114B hybrid powertrain control module 2 accessory wake-up serial data 2 circuit terminal 69 X2 and earth.
    5. ⇒If greater than the specified range, replace the control module that was just disconnected.
  5. Repeat step 3 until all control modules on the K114B hybrid powertrain control module 2 accessory wake-up serial data 2 circuit terminal 69 X2 have been disconnected.
  6. Repair the short-circuit to earth on the accessory wake-up serial data 2 circuit.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup.

   


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