Diagnostic Instructions

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

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Temperature Sensor 1 Signal	P0A9D	P0A9E	P0A9E	--
Temperature Sensor 1 Low Reference	--	P0A9E	--	--
Temperature Sensor 2 Signal	P0AC7	P0AC8	P0AC8	--
Temperature Sensor 2 Low Reference	--	P0AC8	--	--
Temperature Sensor 3 Signal	P0ACC	P0ACD	P0ACD	--
Temperature Sensor 3 Low Reference	--	P0ACD	--	--
Temperature Sensor 4 Signal	P0AEA	P0AEB	P0AEB	--
Temperature Sensor 4 Low Reference	--	P0AEB	--	--

Typical Scan Tool Data

Hybrid Batt. Mod. 1-4 Temperature

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: 26°C (79°F)
Signal	100°C (212°F)	-40°C (-40°F)	-40°C (-40°F)
Low Reference	--	-40°C (-40°F)	--

Hybrid Batt. Mod. 1-4 Temp. Sensor

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Ignition ON Parameter Normal Range: 3.2 Volts
Signal	0 Volts	4.75 Volts	5 Volts
Low Reference	--	-40°C (-40°F)	--

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 (GBCM) uses the battery temperature sensors to determine the hybrid battery temperature to control the battery cooling fan operation.

Conditions for Running the DTC

Conditions for Setting the DTC

P0A9C, P0AC6, P0ACB, and P0AE9

The hybrid battery temperature sensor is in normal operating range, but is 15°C (27°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

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 Energy Storage Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Drive Motor Generator Battery Cooling Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

1. Ignition ON, command the battery cooling fan ON and OFF with a scan tool. Listen for the operation of the fan.
2. Ignition ON, observe all four hybrid battery module temperature sensor parameters with a scan tool. The readings should be between -39 and +95°C (-38 and +203°F) with no greater than a 15°C (27°F) difference between any of the four temperature sensor readings.

Circuit/System Testing

1. Verify that DTCs P0A80, P0A81 and P0BBD are not set.

⇒	If any of the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

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.
2. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
3. Remove the drive motor generator battery cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement.
4. Inspect the battery for the following conditions:

•	Obstructed inlet or outlet duct

•	Damaged fan blades

•	Missing or damaged internal foam seals

⇒	If any of the conditions are present, repair or replace any damaged components.

5. Ignition OFF, disconnect the X3 connector at the GBCM.
6. Ignition OFF, test for less than 5 Ω between the low reference terminals of the GBCM listed below and ground.

•	Terminal 2

•	Terminal 4

•	Terminal 6

•	Terminal 8

⇒	If greater than the specified range, test the GBCM ground circuits for an open/high resistance. If the circuits test normal, replace the GBCM.

7. Ignition ON, verify the scan tool Hybrid Batt. Mod. 1-4 Temperature parameters are -40°C (-40°F).

⇒	If greater than the specified value, replace the GBCM.

8. Install a 3 A fused jumper wire between the appropriate signal terminal listed below and the low reference terminal 2 of the GBCM. Verify the appropriate scan tool Hybrid Batt. Mod. 1-4 Temperature is 100°C (212°F).

•	Terminal 1, for temperature sensor 1

•	Terminal 3, for temperature sensor 2

•	Terminal 5, for temperature sensor 3

•	Terminal 7, for temperature sensor 4

⇒	If less than the specified value, replace the GBCM.

9. If all circuits test normal, test or replace the temperature sensors.

Component Testing

Temperature Sensor Test

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. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
2. Remove the drive motor generator battery cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement.
3. Allow the batteries to cool.
4. Unclip and remove all four hybrid battery temperature sensors from the batteries and allow them to stand at room air temperature for approximately 3 minutes.
5. Ignition OFF, disconnect the X3 connector at the GBCM.
6. Test the resistance across each temperature sensor 5 V reference and low reference circuits. Refer to Temperature Versus Resistance. All sensors should measure within 500 Ω of each other.

⇒	If greater than 500 Ω, replace the drive motor battery sensor module wiring harness assembly.

7. If all circuits test normal, replace the drive motor generator battery control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.