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P0A95




DTC P0A95

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 P0A95
- High Voltage Fuse

Diagnostic Fault Information






Circuit/System Description

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery.

The high voltage direct current (DC) voltage system is protected by a 125 A fuse. The fuse is located in the high voltage manual disconnect lever and can only be serviced by replacing the high voltage manual disconnect lever. The fuse is located between the negative and positive terminals at hybrid battery 11.

Conditions for Running the DTC

* DTC P0A1F is not set.

* The ignition is ON.

* The high voltage interlock is normal.

* The high voltage contactors are closed.

* The 12 V battery voltage is 9-18 V.

Conditions for Setting the DTC

All of the following conditions exist for 1 second:

* Hybrid Battery 10 voltage is greater than 2 V.

* Hybrid Battery 11 voltage is less than 2 V.

* Hybrid Battery 12 voltage is greater than 2 V.

Action Taken When the DTC Sets

DTC P0A95 is a type C DTC.

Conditions for Clearing the DTC

* DTC P0A95 is a type C DTC.

* DTC P0A95 will clear when the contactors are closed, and all of the following conditions exist for 1 second:

- Hybrid Battery 10 voltage is less than 2 V.

- Hybrid Battery 11 voltage is greater than 2 V.

- Hybrid Battery 12 voltage is less than 2 V.

Diagnostic Aids

* Avoid cycling the ignition unnecessarily while the fuse is open. Turning the ignition ON twice with an open fuse results in a 20-40 minute precharge wait time, during which time precharging will be inhibited. It will be necessary to wait until the scan tool Precharge Wait Time parameter counts down to 0 Seconds before continuing with diagnosis.

* When the high voltage fuse is open the vehicle will not start.

* Test for high voltage interLock circuit operation by lifting up on the high voltage manual disconnect lever to disengage the high voltage interLock circuit. Monitor the high voltage interLock source and return current on the scan tool. High voltage interLock return current should read 0 mA a when the high voltage manual disconnect lever is lifted.

* If DTC P0A95 or P0ABC sets when the manual disconnect lever is removed, the high voltage interLock circuit may have a wire to wire short on the high voltage interLock source and return circuits between the X350 and the high voltage manual disconnect lever connector.

* If the high voltage fuse opens as soon as the high voltage manual disconnect is installed with the ignition OFF and the high voltage contactors are not stuck closed, the problem is internal to the drive motor generator battery assembly.

* If the fuse is open or the high voltage manual disconnect lever is removed, the scan tool parameter will display 0 V for hybrid battery 11.

Reference Information

Schematic Reference

* Hybrid Energy Storage Schematics [1][2]Battery System, Hybrid Drive

* Hybrid Controls Schematics Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

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 Control Module References for scan tool information

Special Tools

* EL-48458 - HV Precharge Tester

* EL-48569 - Terminal Covers

* EL-48900 - HEV Safety Kit

Circuit/System Verification

1. Verify that DTC P1A20 or P1AE7 is not set, and that no drive motor generator control module DTCs are set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition ON, observe the scan tool Hybrid Battery 11 parameter. The reading should be between 10-19 V.

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 includes the following steps:


* 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 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. Connect the 12 V battery.

3. Ignition ON, verify the scan tool, drive motor generator battery High Voltage Interlock Status parameter displays failed.

• If not the specified value and the manual disconnect is removed, refer to DTC P1AE2-P1AE4, P1B05, or P1B06 P1AE2.

4. Connect the EL-48458 - HV precharge tester at the drive motor generator battery assembly. Refer to the EL-48458 - HV precharge tester installation procedure located in High Voltage System Diagnosis (EL-48458) High Voltage System Diagnosis (EL-48458).

Note: Install a manual disconnect lever with a verified good fuse or a new manual disconnect lever.

5. Install the manual disconnect lever.

6. Ignition ON, precharge the high voltage system by moving the high voltage contactor relay switch on the tester to the closed position. Verify that the Hi-voltage greater than 60 V LED illuminates and stays illuminated. Wait 3 minutes. Verify the high voltage 125 A fuse does not open and that the precharge does not fail.

• If the fuse opened or the precharge failed, test the internal battery assembly high voltage cables for a short to ground or an open/high resistance. If the circuits test normal, replace the drive motor generator battery assembly.

7. Ignition OFF, disconnect the X2 and X3 drive motor generator power inverter module cables.

8. Test for infinite resistance between the terminals listed below and ground;

* B+ (300 V) X2

* Ground (300 V) X3

• If less than the specified value replace the high voltage cables.

9. Test for infinite resistance between the B+ (300 V) terminal X1 and the ground (300 V) terminal X2 cables.

• If less than the specified range replace the high voltage cables.

10. Disconnect the air conditioning control module terminal B+ (300 V) X4 and the ground (300 V) terminal X5.

11. Test for infinite resistance between the terminals listed below and ground:

* B+ (300 V) X4

* Ground (300 V) X5

• If less than the specified range, replace the air conditioning control module.

12. Test for greater than 50k ohms between the B+ (300 V) terminal X4 and the ground (300 V) terminal X5.

• If less than the specified range, test the circuits for a short between them. If the circuits test normal, replace the air conditioning control module assembly.

13. If all circuits test normal, replace the drive motor generator power inverter module.

Repair Instructions

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

* Drive Motor Battery Negative Relay Cable Replacement Drive Motor Battery Negative Relay Cable Replacement

* Drive Motor Battery Positive Relay Cable Replacement Drive Motor Battery Positive Relay Cable Replacement

* Drive Motor Battery 300-Volt Positive and Negative Cable Replacement Drive Motor Battery 300-Volt Positive and Negative Cable Replacement

* Drive Motor Battery Replacement and Shipping Preparation Procedures

* Air Conditioning Compressor Replacement (LU3) Removal and ReplacementAir Conditioning Compressor Replacement (LZ1, L20, LC9, L9H, L92, LMG) Removal and ReplacementAir Conditioning Compressor Replacement (LGH, LML) Removal and Replacement

* Control Module References Control Module References for drive motor generator battery control module, drive motor generator power inverter module, or air conditioning control module replacement, setup, and programming

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