• | 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 |
---|---|---|---|
Air Inlet Sensor 5 Volt Reference | P0AAE | P0AAF | -- |
Air Inlet Sensor Low Reference | P0AAE | P0AAF | P0AAF |
Air Outlet Sensor 5 Volt Reference | P0AB3 | P0AB4 | -- |
Air Outlet Sensor Low Reference | P0AB3 | P0AB4 | P0AB4 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Accessory voltage is 9-18 volts, vehicle power mode is RUN Parameter Normal Range: 26°C (79°F) | |||
Hybrid Battery Inlet Air Temperature Sensor 5 volt Reference Circuit | 100°C (212°F) | -40°C (-40°F) | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Accessory voltage is 9-18 volts, vehicle power mode is RUN Parameter Normal Range: 0.5 to 4.3 Volts | |||
Hybrid Batt Inlet Air Temperature Sensor 5 volt Reference Circuit | 0 volts | 4.75 volts | 5 volts |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Accessory voltage is 9-18 volts, vehicle power mode is RUN Parameter Normal Range: 26°C (79°F) | |||
Hybrid Battery Outlet Air Temperature 5 volt Reference Circuit | 100°C (212°F) | -40°C (-40°F) | -40°C (-40°F) |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Accessory voltage is 9-18 volts, vehicle power mode is RUN Parameter Normal Range: 0.5 to 4.3 Volts | |||
Hybrid Batt Outlet Air Temp Sensor 5 volt Reference Circuit | 0 volts | 4.75 volts | 5 volts |
The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The BECM will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the BECM to the hybrid powertrain control module (HPCM) through the Hybrid LAN communication circuit. The HPCM is the host controller for diagnostic trouble code (DTC) information.
The drive motor generator battery assembly has an air inlet and air outlet temperature sensors. The air inlet and air outlet temperature sensors are located on the inlet and outlet air ducts of the hybrid battery vent fan. The air inlet temperature sensor is referred to as sensor 1 and the air outlet temperature sensor is referred to as sensor 2. The air temperature sensors are a variable resistor that measures the temperature of the inlet and outlet air. The control module supplies 5 volts to the signal circuit and a ground for the low reference circuit. The air inlet and outlet temperature sensor resistance changes with temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The BECM uses the air inlet and outlet temperature sensors to determine if air is circulating through the drive motor generator battery assembly.
• | The vehicle power mode is RUN. |
• | Accessory voltage is 9-18 volts. |
The hybrid battery pack air temperature sensor 1 or 2 is less than -40°C (-40°F).
The hybrid battery pack air temperature sensor 1 or 2 is greater than 95°C (203°F).
The hybrid battery cooling fan is ON and the difference between sensor 1 and 2 is greater than 10°C (18°F) difference for 9 out of 10 seconds.
The hybrid battery cooling fan is ON and the outlet air temperature is greater than maximum hybrid battery temperature value by 10°C (18°F) for 9 out of 10 seconds.
• | The drive motor generator battery sends a message to the HPCM to reduce the power by 50 percent. |
• | DTCs P0AAD, P0AAE, P0AAF, P0AB2, P0AB3, and P0AB4 are Type B DTCs. |
DTCs P0AAD, P0AAE, P0AAF, P0AB2, P0AB3, and P0AB4 are Type B DTCs.
Hybrid Energy Storage Schematics
Control Module References for scan tool information
EL-48900 HEV Safety Kit
⇒ | If no obstructions or blockages are found, continue with diagnosis and proceed to the next step. |
⇒ | If inlet air obstructions or blockages are found, remove or repair as needed. |
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 the temperature sensor parameters are not approximately the same value, continue to next step. |
⇒ | If the temperature sensor parameters are approximately the same value, inspect the internal foam seals for damage or if missing and repair as needed. Check for proper cooling fan operation and air flow. |
⇒ | If greater than the specified value, replace the drive motor battery sensor module wiring harness. |
⇒ | If less than the specified value, replace the drive motor generator battery control module and install the temperature sensors. Refer to Generator Battery Temperature Sensor Location for the proper locations. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for drive motor generator battery control module replacement, setup and programming |