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P0AC2




DTC P0AC0, P0AC1, P0AC2, or P1A07

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptors
DTC P0AC0
- Hybrid Battery Current Sensor Performance

DTC P0AC1
- Hybrid Battery Current Sensor Circuit Low Voltage

DTC P0AC2
- Hybrid Battery Current Sensor Circuit High Voltage

DTC P1A07
- Battery Energy Control Module 5-Volt Reference Circuit

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for DTC information.

The hybrid battery current sensor is mounted inside the drive motor battery disconnect control module. The positive high voltage cable that goes to the positive contactor passes through the current sensor. The current sensor detects the amperage that flows in and out of the hybrid batteries. The drive motor generator battery control module supplies and monitors a 5 V reference signal to the current sensor. The current sensor returns a signal between 0 and 5 V to the drive motor generator battery control module. The current sensor signal is in proportion to the amperage going in and out of the drive motor generator battery. A signal voltage of the current sensor greater than 2.5 V indicates that the drive motor generator battery is being discharged and a signal voltage less than 2.5 V indicates charging. The hybrid battery current sensor measures from -200 to +200 A.

Conditions for Running the DTC

* The vehicle power mode is RUN.
* Accessory voltage is 9-18 V.

Conditions for Setting the DTC

P0AC0

One of the following conditions exists:

* The drive motor generator battery control module detects more than 3 A on the current sensor after a successful HV system power down and after the contactors have opened.
* The drive motor generator battery control module detects a change in total pack voltage greater than 5 V and the current sensor measures less than a 0.5 A for 10 seconds.

P0AC1

The drive motor generator battery control module detects that the current sensor is greater than -200 A for 3 seconds.

P0AC2

The drive motor generator battery control module detects that the current sensor is less than +200 A for 3 seconds.

P1A07

The drive motor generator battery control module detects less than 4.8 V or greater than 5.2 V on the 5 V reference circuit.

Action Taken When the DTC Sets

* DTCs P0AC0, P0AC1, and P0AC2 are type B DTCs.
* DTC P1A07 is a type A DTC.
* State of charge goes to invalid.
* The drive motor generator battery control module sends a message to the drive motor generator control module requesting that the hybrid battery power limit be set to 3 kilowatts, resulting in minimal hybrid function.

Conditions for Clearing the DTC

* DTCs P0AC0, P0AC1, and P0AC2 are type B DTCs.
* DTC P1A07 is a type A DTC.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Drive Motor Generator Battery Description (Drive Motor Generator Battery Identification Information)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

Ignition ON, observe the scan tool Calc. Hybrid Batt. Current parameter. The reading should be between -200 and +200 A, and change with the amount of current draw on the drive motor generator battery.

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.

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

1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
2. Disconnect the X4 harness connector at the drive motor battery disconnect control module.
3. Ignition OFF, test for less than 5 Ohms between the low reference circuit terminal 6 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.

4. Connect the 12 V battery.
5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 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 drive motor generator battery control module.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Calc. Hybrid Battery Current parameter is greater then -200 A.

• If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.

7. If all circuits test normal, replace the drive motor battery disconnect control module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Drive Motor Battery Disconnect Control Module Replacement (Drive Motor Battery Disconnect Control Module Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming

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