P0AEB

DTC P0A9C-P0A9E, P0AC6-P0AC8, P0ACB-P0ACD, P0AE9, P0AEA, or P0AEB

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 P0A9C
- Hybrid Battery 1 Temperature Sensor Circuit 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 Circuit 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 Circuit 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 Circuit Performance

DTC P0AEA
- Hybrid Battery 4 Temperature Sensor Circuit Low Voltage

DTC P0AEB
- Hybrid Battery 4 Temperature Sensor Circuit High Voltage

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 control module supplies 5 volts 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 battery energy 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 vehicle power mode is RUN.
* Accessory voltage is 9-18 volts.

Conditions for Setting the DTC

* Circuit High - the hybrid battery temperature is lower than -40°C (-40°F).
* Circuit Low - The hybrid battery temperature is higher than 95°C (203°F).
* Circuit Performance - The hybrid battery temperature is in normal operating range, but has a temperature 10°C (18°F) difference from the other 3 sensors.

Action Taken When the DTC Sets

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEB, and P0AEA are Type B DTCs.

Diagnostic Aids

Wear insulated gloves while inspecting for the following conditions:

* Loose or poor connections at the BECM temperature sensor harness connector.
* Damage to the wire harness.

Special Tools

* EL-48569 Terminal Covers
* EL-489000 HEV Safety Kit
* Voltage vs. Current Table

Circuit/System Verification

1. Ignition ON, with a scan tool, monitor all four hybrid battery module temperature sensors. The hybrid battery temperature parameters should be between -40°C (-40°F) and 95°C (203°F) with no more than 10°C (18°F) difference between the four temperature sensors.
2. Operate the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records Data.

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" isolation gloves rated at 1000V with leather protectors

- Visually and functionally inspect the gloves before use.

- Wear the isolation 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.

Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.

1. Remove the drive motor generator battery cover.
2. Verify that all four temperature sensors are fully seated at each location.
3. Disconnect the X3 connector at the BECM.
4. Test the resistance across each temperature sensor 5 volt reference and low reference circuits.

^ If greater than 25 ohms, replace the temperature sensor and sensor harness.
^ If less than 25 ohms, replace the BECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Verification Tests

* Drive Motor Battery Control Module Harness Replacement
* Drive Motor Generator Battery Control Module and Bracket Replacement