P0A9E
DTC P0A9C-P0A9E, P0AC6-P0AC8, P0ACB-P0ACD, P0AE9, P0AEA, or P0AEB
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 P0A9C
- Hybrid Battery 1 Temperature Sensor Performance
DTC P0A9D
- Hybrid Battery 1 Temperature Sensor Circuit Low Voltage
DTC P0A9E
- Hybrid Battery 1 Temperature Sensor Circuit High Voltage
DTC P0AC6
- Hybrid Battery 2 Temperature Sensor Performance
DTC P0AC7
- Hybrid Battery 2 Temperature Sensor Circuit Low Voltage
DTC P0AC8
- Hybrid Battery 2 Temperature Sensor Circuit High Voltage
DTC P0ACB
- Hybrid Battery 3 Temperature Sensor Performance
DTC P0ACC
- Hybrid Battery 3 Temperature Sensor Circuit Low Voltage
DTC P0ACD
- Hybrid Battery 3 Temperature Sensor Circuit High Voltage
DTC P0AE9
- Hybrid Battery 4 Temperature Sensor Performance
DTC P0AEA
- Hybrid Battery 4 Temperature Sensor Circuit Low Voltage
DTC P0AEB
- Hybrid Battery 4 Temperature Sensor Circuit High Voltage
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 control module 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 (BECM) uses the battery temperature sensors to determine the hybrid battery temperature to control the battery cooling fan operation.
Conditions for Running the DTC
* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
Conditions for Setting the DTC
P0A9C, P0AC6, P0ACB, and P0AE9
The hybrid battery temperature sensor is in normal operating range, but is 15°C (59°F) different from the other 3 sensors.
P0A9D, P0AC7, P0ACC, and P0AEA
The hybrid battery temperature is greater than 95°C (203°F) and one other temperature sensor is less than 70°C (158°F).
P0A9E, P0AC8, P0ACD, and P0AEB
The hybrid battery temperature is less than -40°C (-40°F).
Action Taken When the DTC Sets
* DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are type B DTCs.
* If two sensors fail, the drive motor generator battery sends a message to the hybrid powertrain control module to reduce the power use limit to 50 percent and the battery vent fan will default to run.
* If all four sensors fail, the state of charge (SOC) will be considered invalid.
Conditions for Clearing the DTC
DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are type B DTCs.
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)
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 (Programming and Relearning) 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 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 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.
4. Test for 1k ohm-209k ohm between each of 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 diagnostic procedure.
* Drive Motor Battery Sensor Module Wiring Harness Replacement (Drive Motor Battery Sensor Module Wiring Harness Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming