P0AAF

High-Voltage Traction Battery

Pinpoint Test K: DTC P0AAE:00 or P0AAF:00

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

With the ignition in the ON position and the engine running or OFF, the Battery Pack Sensor Module (BPSM) monitors the High Voltage Traction Battery (HVTB) internal temperature. The BPSM (Battery Pack Sensor Module) communicates the HVTB (High Voltage Traction Battery) temperature (in addition to other information) to the Battery Energy Control Module (BECM) through a dedicated Controller Area Network (CAN). There is also a HVTB (High Voltage Traction Battery) inlet air temperature sensor mounted to the inlet air duct which monitors inlet air temperature to the HVTB (High Voltage Traction Battery). The BECM (Battery Energy Control Module) uses the information from the various temperature sensors to control and maintain HVTB (High Voltage Traction Battery) temperature by controlling the HVTB (High Voltage Traction Battery) cooling fan. The ideal HVTB (High Voltage Traction Battery) temperature is 25°C (77°F) with a desired range of 20°C (68°F) to 30°C (86°F).

- P0AAE:00 (Hybrid Battery Pack Air Temperature Sensor A Circuit Low: No Sub Type Information)- Fault sets if the BECM (Battery Energy Control Module) senses greater than 90°C (194°F) from the HVTB (High Voltage Traction Battery) inlet air temperature sensor for 10 seconds or more. Extreme ambient temperatures could also set this DTC.

- P0AAF:00 (Hybrid Battery Pack Air Temperature Sensor A Circuit High: No Sub Type Information)- Fault sets if the BECM (Battery Energy Control Module) senses less than -45°C (-49°F) from the HVTB (High Voltage Traction Battery) inlet air temperature sensor for 10 seconds or more. Extreme ambient temperatures could also set this DTC.

This pinpoint test is intended to diagnose the following:

- HVTB (High Voltage Traction Battery) inlet air temperature sensor

- BECM (Battery Energy Control Module)

- HVTB (High Voltage Traction Battery)

PINPOINT TEST K : DTC P0AAE:00 OR P0AAF:00

WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

K1 MEASURE THERMISTOR RESISTANCE FROM BECM (Battery Energy Control Module)

WARNING: Never install the service disconnect plug with the high-voltage bussed electrical center (BEC) cover removed. Always install the cover prior to connecting the service disconnect plug. The high-voltage BEC cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.

- Ignition OFF.

- Depower the HVTB (High Voltage Traction Battery) system. Refer to High-Voltage Traction Battery Systems Depowering .

- Remove the high-voltage Bussed Electrical Center (BEC) cover. Refer to the exploded view in Battery Pack Sensor Module (BPSM) .

- Disconnect: Battery Energy Control Module (BECM) C4237B.

- Measure the resistance between BECM (Battery Energy Control Module) C4237B-39, circuit J1-A39, harness side and BECM (Battery Energy Control Module) C4237B-41, circuit J1-A41, harness side. Use the following table to determine if the resistance values are correct.

Temperature Range Resistance Range -30°C (-22°F) to -20°C (-5°F) 52,594 ohms - 28,582 ohms -20°C (-4°F) to -10°C (13°F) 28,582 ohms - 16,120 ohms -10°C (14°F) - 0°C (32°F) 16,120 ohms - 9,399 ohms 0°C (32°F) - 10°C (51°F) 9,399 ohms - 5,685 ohms 10°C (52°F) - 20°C (68°F) 5,685 ohms - 3,511 ohms 20°C (69°F) - 30°C (86°F) 3,511 ohms - 2,240 ohms 30°C (87°F) - 40°C (104°F) 2,240 ohms - 1,465 ohms 40°C (105°F) - 50°C (122°F) 1,465 ohms - 980 ohms 50°C (122°F) - 60°C (140°F) 980 ohms - 671 ohms 60°C (140°F) - 70°C (158°F) 671 ohms - 469 ohms





Is the resistance value correct for the temperature?

Yes
GO to K3.

No
GO to K2.

K2 MEASURE THERMISTOR RESISTANCE AT THE THERMISTOR

- Disconnect: HVTB (High Voltage Traction Battery) Inlet Air Temperature Sensor C4253.

- Measure the resistance between HVTB (High Voltage Traction Battery) inlet air temperature sensor C4253 pin 1 and pin 2, component side. Use the following table to determine if the resistance values are correct.

Temperature Range Resistance Range -30°C (-22°F) to -20°C (-5°F) 52,594 ohms - 28,582 ohms -20°C (-4°F) to -10°C (13°F) 28,582 ohms - 16,120 ohms -10°C (14°F) - 0°C (32°F) 16,120 ohms - 9,399 ohms 0°C (32°F) - 10°C (51°F) 9,399 ohms - 5,685 ohms 10°C (52°F) - 20°C (68°F) 5,685 ohms - 3,511 ohms 20°C (69°F) - 30°C (86°F) 3,511 ohms - 2,240 ohms 30°C (87°F) - 40°C (104°F) 2,240 ohms - 1,465 ohms 40°C (105°F) - 50°C (122°F) 1,465 ohms - 980 ohms 50°C (122°F) - 60°C (140°F) 980 ohms - 671 ohms 60°C (140°F) - 70°C (158°F) 671 ohms - 469 ohms





Is the resistance value correct for the temperature?

Yes
INSTALL a new HVTB (High Voltage Traction Battery) (includes HVTB (High Voltage Traction Battery) system wire harness). REFER to High-Voltage Traction Battery . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new HVTB (High Voltage Traction Battery) inlet air temperature thermistor. REFER to High-Voltage Traction Battery Inlet Air Temperature Sensor . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

K3 CHECK FOR CORRECT BECM (Battery Energy Control Module) OPERATION

- Ignition OFF.

- Check the BECM (Battery Energy Control Module) harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.


- Connect the BECM (Battery Energy Control Module) and make sure the connectors seat correctly.

- Operate the system and determine if the concern is still present.

Is the concern still present?

Yes
INSTALL a new BECM (Battery Energy Control Module). REFER to Battery Energy Control Module (BECM) . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.