P0A95
DTC P0A95
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0A95
- High Voltage Fuse
Typical Scan Tool Data
Circuit/System Description
The hybrid battery pack is protected by a 125A fuse. The fuse is located in the high voltage manual disconnect lever. The fuse is positioned between the negative and positive terminals at hybrid battery 11. If the fuse is open or the high voltage manual disconnect lever is removed, the scan tool parameter will display 0 volts for hybrid battery 11. The battery energy control module (BECM) monitors the high voltage interlock circuit (HVIC) for normal operation along with hybrid battery 11 voltage in order to determine if the high voltage fuse is open. If the fuse is open this could indicate that there may be a short between the positive and negative high voltage bus. The high voltage bus is isolated from chassis ground.
Conditions for Running the DTC
* The vehicle power mode is RUN.
* Accessory voltage is 9-18 volts.
Conditions for Setting the DTC
* HVIC normal operation.
* Hybrid battery voltage reading 10 is more than 2 volts.
* Hybrid battery voltage reading 11 is less than 2 volts.
* Hybrid battery voltage reading 12 is more than 2 volts.
Action Taken When the DTC Sets
* DTC P0A95 is a Type C DTC.
* When this fuse is open the vehicle will not start.
Conditions for Clearing the DTC
* HVIC normal operation.
* Hybrid battery voltage reading 10 is more than 2 volts.
* Hybrid battery voltage reading 11 is more than 2 volts.
* Hybrid battery voltage reading 12 is more than 2 volts.
* DTC P0A95 is a Type C DTC.
Diagnostic Aids
Check for HVIC circuit operation by lifting up on the high voltage manual disconnect lever to disengage the HVIC circuit. Check the HVIC source and return current on the scan tool. HVIC return current should read 0 ma when the high voltage manual disconnect lever is lifted.
Special Tools
* EL-48458 Pew-Charge Test Tool
* EL-48569 Terminal Covers
* EL-489000 HEV Safety Kit
Circuit/System Verification
1. Ignition ON, verify 11-19 volts for hybrid battery 11, with scan tool.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data.
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.
Ignition ON, engine OFF, verify 11-19 volts for hybrid battery 11, with a scan tool.
^ If the voltage is not within the specified range, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling. Visually inspect all high voltage (HV) direct current (DC) cables for damage or conditions that may have caused them to short together. Inspect the high voltage cables between the drive motor generator battery and the DMGCM, and between the DMGCM and the air conditioning compressor. If any of the HV cables are damaged, replace the damaged HV cables, and the high voltage manual disconnect lever.
1. Disconnect the air conditioning compressor HV DC cable.
2. Re-assemble the DMGCM cables, covers and sight shield, leaving the HV DC cable for the air conditioning compressor disconnected.
3. Install a new high voltage manual disconnect lever.
4. Enable the high voltage. Ignition ON, Wait 3 minutes, verify 11-19 volts for hybrid battery 11, with a scan tool in order to verify if the HV fuse is not open circuit.
^ If the voltage is with in the specified range, replace the air conditioning compressor.
5. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
6. Connect the pre-charge test tool.
7. Install a new high voltage manual disconnect lever.
8. Ignition ON, precharge the system by moving the contactor command switch on the tester to the closed position. Wait 3 minutes, verify 11-19 volts for hybrid battery 11, with a scan tool in order to verify if the HV fuse is not open circuit.
^ If the voltage is within the specified range, replace the DMGCM.
9. Ignition off disconnect the precharge tester. Refer to precharge tester disconnect procedure.
10. Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
11. Disconnect the HV DC cables at the drive motor generator battery.
12. Using a DMM, verify infinite resistance between the HV+ and HV- of the DC cables from the drive motor generator battery to the DMGCM.
^ If less than infinite resistance replace the HV DC cable and the high voltage manual disconnect lever.
^ If HV cable resistance is infinite resistance, replace the drive motor generator battery assembly.
Component 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.
Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
1. Remove the high voltage manual disconnect lever. With a DMM, test the high voltage fuse for 0.00 ohms.
^ If NO continuity, or the ohms reading is greater than 0.01 replace the high voltage manual disconnect lever.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair. Verification Tests
* Drive Motor Battery 300-Volt Positive and Negative Cable Replacement
* Drive Motor Generator Battery Replacement
* Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) Compressor Replacement (HP2)