• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Temperature Sensors 1-4 Signal | P0A9D, P0AC7, P0ACC, P0AEA | P0A9E, P0AC8, P0ACD, P0AEB | P0A9E, P0AC8, P0ACD, P0AEB |
Temperature Sensors 1-4 Low Reference | -- | P0A9E, P0AC8, P0ACD, P0AEB | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The ignition is ON. Parameter Normal Value: 26°C (78.8°F) | |||
Temperature Sensors 1-4 Signal | 100°C (212°F) | -40°C (-40°F) | -- |
Temperature Sensors 1-4 Low Reference | -- | -40°C (-40°F) | -- |
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 (GBCM) 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 GBCM uses the battery temperature sensors to control the battery cooling fan operation.
The 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 GBCM to open the high voltage contactor relays.
• | 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. |
The HPCM detects an average battery temperature greater than 73°C (163°F) for 5 seconds.
One of the following conditions exists:
• | The GBCM detects an average battery temperature increase of 2°C (3.6°F) in a 20 second event for 3 consecutive events totaling 60 seconds. |
• | The GBCM detects 2 battery temperature sensors greater than 65°C (149°F) for 5 seconds. |
• | The GBCM detects any battery temperature sensor greater than 70°C (158°F). |
The HPCM commands the GBCM to open the high voltage contactor relays when the vehicle speed is below 5 km/h (3 mph).
The GBCM sends a message to the HPCM requesting the high voltage contactor relays open. The HPCM will command the contactor relays open when the vehicle speed is less than 5 km/h (3 mph).
DTCs P0A7E and P1ABE are type C DTCs.
• | 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. |
• | Test the resistance across each temperature sensor 5 V reference and low reference circuits. Refer to 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 for the proper locations of the four temperature sensors. |
Drive Motor Generator Battery Cooling Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
EL-48900 HEV Safety Kit
⇒ | If any of the DTCs are set, 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.
⇒ | If obstructed, remove or repair as needed for proper air flow. |
⇒ | If fan or blades are damaged replace the battery vent fan. |
⇒ | If not within the specified range, replace the drive motor battery sensor module wiring harness assembly. |
Verify that the resistance of each temperature sensor is within specification, and within 500 Ω of each other. Refer to Temperature Versus Resistance.
⇒ | If not within the specified range, replace the drive motor battery sensor module wiring harness assembly. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References - for drive motor generator battery control module replacement, setup and programming. |