P1ABE
DTC P0A7E or P1ABE
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 P0A7E
- Hybrid Battery Pack Overtemperature
DTC P1ABE
- Battery Energy Control Module Hybrid Battery Pack Overtemperature
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The drive motor generator battery has four hybrid battery temperature sensors. The hybrid battery temperature sensors are located on the top of the hybrid batteries. The temperature sensor is a variable resistor that measures the temperature of the hybrid batteries. The drive motor generator battery control module (BECM) supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid battery temperature sensor resistance changes with battery temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The BECM uses the battery temperature sensors to control the battery cooling fan operation.
The hybrid powertrain control module (HPCM) monitors the average battery pack temperature over serial data. When the average drive motor generator battery temperature exceeds the calibrated temperature the HPCM will set DTC P0A7E and send a command to the BECM to open the high voltage contactor relays.
Conditions for Running the DTC
* DTC P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, or P0AEB is not set.
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
Conditions for Setting the DTC
P0A7E
The HPCM detects an average battery temperature greater than 70°C (158°F) for 12 seconds.
P1ABE
One of the following conditions exists:
* The BECM detects any battery temperature sensor greater than 70°C (158°F) for 12 seconds.
* The BECM detects 2 battery temperature sensors greater than 70°C (158°F) for 12 seconds.
Action Taken When the DTC Sets
P0A7E
* DTCs P0A7E and P1ABE are type C DTCs.
* The HPCM commands the BECM to open the high voltage contactor relays when the vehicle speed is below 5 km/h (3 mph).
P1ABE
* DTCs P0A7E and P1ABE are type C DTCs.
* The BECM sends a message to the HPCM requesting to open the high voltage contactors. The HPCM will command the contactor relays open when the vehicle speed is less than 5 km/h (3 mph).
Conditions for Clearing the DTC
DTCs P0A7E and P1ABE are type C DTCs.
Diagnostic Aids
* Battery temperatures can be affected by vehicle load, outside temperature and customer driving conditions. Test drive the vehicle, and attempt to simulate the Freeze Frame/Failure Record conditions this DTC set under.
* An open 5 V reference or ground circuit will have a default scan tool reading of 214°C and 4.99 V.
* Inspect for the following:
- Air inlet and outlet for blockage.
- Loose or poor connections at the drive motor generator battery control module temperature sensor module X3 harness connector.
- Damage to the drive motor generator battery control module temperature sensor module wiring harness.
- Damage to the fan or blades.
* Test the resistance across each temperature sensor 5 V reference and low reference circuits. Refer to Temperature Versus Resistance (Electrical Specifications).
* If the hybrid batteries are at or above the temperature values for setting these DTCs, allow the hybrid batteries to cool down by letting the vehicle stand at room temperature, this could take 4 to 8 hours.
* Use the scan tool output control to test the drive motor generator battery vent fan operation.
* Inspect the ground circuit for the drive motor generator battery vent fan relay.
* Inspect the drive motor generator battery vent fan relay connections.
* Refer to Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Control Module and Bracket Replacement) for the proper locations of the four temperature sensors.
Reference Information
Schematic Reference
Hybrid Cooling Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Drive Motor Generator Battery Cooling Description (Drive Motor Generator Battery Cooling Description)
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
1. Verify that DTC P0A81, P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0A80, P0BBD, or P0AEB is not set.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).
2. Ignition ON, observe the scan tool GBCM hybrid battery temperature parameters. The readings should be between -39 and +69°C (-40 and +156°F).
3. Command the drive motor generator battery vent fan ON in all speed ranges with a scan tool. You should hear the vent fan relay softly click when turned ON and OFF. You should notice a change in fan speed as you increase the commanded speed. There is approximately a 5 second delay from when the battery vent fan speed is commanded before the vent fan speed changes.
Circuit/System Testing
Danger: Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 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 at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedure exactly as written may result in serious injury or death.
1. Inspect the inlet air vents for any obstructions or blockages that are external to the drive motor generator battery.
• If inlet air obstructions or blockages are found, remove or repair as needed, Clear the DTC and verify the fan operation.
2. Inspect the vent fan for any damage to the fan blades.
• If fan or blades are damaged, replace the drive motor generator battery assembly.
3. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
4. Connect the 12 V battery.
5. Ignition ON, with a scan tool command the Battery Pack Fan Speed through all the speed ranges. using a scan tool. Verify the drive motor battery coolant fan is functional in all speed ranges.
• If the fan does not operate, refer to DTC P0A81 (P0A81).
6. Ignition OFF, disconnect the X 1 harness connector at the drive motor generator battery control module.
Note: The following test must be performed when the battery pack has equalized at room temperature. An increase or decrease in temperature will cause resistance to change and may result in invalid test results.
7. Test the resistance between each of the temperature sensor 5 V reference and low reference circuit terminals listed below. The resistance of each temperature sensor should be within the specified range, and within 500 ohm of each other. Refer to Temperature Versus Resistance (Electrical Specifications).
* Terminal 46 5 V Reference and terminal 41 Low Reference (Sensor 1)
* Terminal 70 5 V Reference and Terminal 6 Low Reference (Sensor 2)
* Terminal 42 5 V Reference and Terminal 40 Low Reference (Sensor 3)
* Terminal 45 5 V Reference and Terminal 22 Low Reference (Sensor 4)
• If not within the specified range, test the drive motor battery sensor module wiring harness for short to voltage, short to ground, or an open/high resistance. If the circuits test normal, replace the drive motor generator battery assembly.
8. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* 171398
* Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Control Module and Bracket Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming