P1ABE
DTC P0A7E or P1ABE
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 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 drive motor generator battery control module uses the battery temperature sensors to control the battery cooling fan operation.
The hybrid powertrain control module monitors the average battery pack temperature over serial data. When the average drive motor generator battery temperature exceeds the calibrated temperature the hybrid powertrain control module will set DTC P0A7E and send a command to the drive motor generator battery control module to open the high voltage contactors.
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 hybrid powertrain control module detects an average battery temperature greater than 73°C (163.4°F) for 5 seconds.
P1ABE
One of the following conditions exists:
* The drive motor generator battery control module detects an average battery temperature increase of 2°C (35.6°F) in a 20 second event for 3 consecutive events totaling 60 seconds.
* The drive motor generator battery control module detects 2 battery temperature sensors greater than 65°C (149°F) for 5 seconds.
* The drive motor generator battery control module detects any battery temperature sensor greater than 70°C (158°F).
Action Taken When the DTC Sets
P0A7E
* DTC P0A7E is a type C DTC.
* The hybrid powertrain control module commands the drive motor generator battery control module to open the high voltage contactors relays when the vehicle speed is below 5 km/h (3 mph).
P1ABE
* DTC P1ABE is a type C DTC.
* The drive motor generator battery control module sends a message to the hybrid powertrain control module requesting the high voltage contactors open. The hybrid powertrain control module will command the contactors 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.
* 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.
- Damage to the internal drive motor generator battery cooling air outlet duct seals.
* Test the resistance across each temperature sensor 5 V reference and low reference circuits. Refer to Temperature Versus Resistance Temperature Versus Resistance.
* 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 Generator Battery Temperature Sensor Location Generator Battery Temperature Sensor Location for the proper locations of the four temperature sensors.
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Drive Motor Battery Cooling Description Drive Motor Battery Cooling 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-48900 HEV Safety Kit
Circuit/System Verification
1. Verify that DTC P0A80, P0A81 or P0BBD is not 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 BECM hybrid battery temperature parameters. The readings should be between -39 and +95°C (-38.2 and +203°F) with no greater than a 15°C ( 59°F) difference between any of the four temperature sensor readings. Refer to Temperature Versus Resistance Temperature Versus Resistance.
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.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling High Voltage Disabling.
2. Verify that none of the following conditions exist:
* The inlet and outlet air vents do not have any obstructions or blockages.
* The vent fan blades are not broken or damaged.
* The internal foam seals are not missing or damaged.
• If any conditions are found, remove, repair or replace as necessary.
3. Ignition OFF, disconnect the X3 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.
4. Test for 1k ohm-209k ohm between the 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 Temperature Versus Resistance.
* Sensor 1-5 V reference circuit terminal 1 and low reference circuit terminal 2
* Sensor 2-5 V Reference circuit terminal 3 and low reference circuit terminal 4
* Sensor 3-5 V Reference circuit terminal 5 and low reference circuit terminal 6
* Sensor 4-5 V Reference circuit terminal 7 and low reference circuit terminal 8
• If not within the specified range, replace the drive motor battery sensor module wiring harness.
5. 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.
* Drive Motor Battery Sensor Module Wiring Harness Replacement Drive Motor Battery Sensor Module Wiring Harness Replacement
* Control Module References Control Module References for drive motor generator battery control module replacement, setup and programming