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P0ADC




DTC P0ADB or P0ADC

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0ADB

-
Hybrid Battery Positive Contactor Control Circuit Low Voltage

DTC P0ADC

-
Hybrid Battery Positive Contactor Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid battery pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the starter/generator control module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the starter/generator control module. The starter/generator control module supplies B+ to each contactor at all times. When the contactors are to be closed, the starter/generator control module will provide a ground to the contactor through a low side driver.

Conditions for Running the DTC

The 12 V battery voltage is greater than 6.0 V

Conditions for Setting the DTC

P0ADB

* An open is detected on the primary contactor control circuit when the contactor control is commanded ON and measured resistance is greater than 200K ohms

* A short to voltage is detected on the primary contactor control circuit when the contactor control is commanded ON and current sense feedback is less than 0.5 A

P0ADC

A short to ground is detected on the primary contactor control circuit when the contactor control is commanded OFF and current sense feedback is less than 0.5 A

Action Taken When the DTC Sets

DTCs P0ADB and P0ADC are type B DTCs

Conditions for Clearing the DTC

DTCs P0ADB and P0ADC are type B DTCs

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Connector End Views By Name

Description and Operation

Drive Motor Battery System Description Drive Motor Battery System Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0AE6 or P0AE7 is not set.

• If either of the DTCs are set

Refer to DTC P0AE6 or P0AE7 P0AE6.

• If none of the DTCs are set

3. Refer to Circuit/System Testing

Circuit/System Testing

Danger:
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.


* Identify how to test for the presence of high voltage.


* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:


* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.


* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.


- Visually and functionally inspect the gloves before use.


- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.


Failure to follow the procedures exactly as written may result in serious injury or death.


Danger:
The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information♦(SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.


Note:
In High Voltage Disabling High Voltage Disabling , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure.

1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.

2. Connect the 12 V battery.

3. Disconnect the X1 harness connector at the KR38 main contactor, ignition ON.

4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

• If the test lamp does not illuminate

1. Ignition OFF, disconnect the harness connector at the K59 starter/generator control module.

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K59 starter/generator control module.

• If the test lamp illuminates

5. Ignition OFF, connect the harness connector at the KR38 main contactor. Disconnect the X4 harness connector at the K59 starter/generator control module, ignition ON.

6. Test for less than 1 V between the control circuit terminal 5 and ground.

• If 1 V or greater

1. Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the KR38 main contactor.

• If less than 1 V

7. Ignition OFF.

8. Test for infinite resistance between the control circuit terminal 5 and ground.

• If less than infinite resistance

1. Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, test or replace the KR38 main contactor.

• If infinite resistance

9. Test for 20-40 ohms between the B+ circuit terminal 4 and the control circuit terminal 5.

• If not between 20-40 ohms

1. Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the KR38 main contactor.

• If between 20-40 ohms

10. Replace the K59 starter/generator control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearning for starter/generator control module replacement, programming, and setup

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