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Pinpoint Test K: DTC P0AA6




High-Voltage Traction Battery

Pinpoint Test K: DTC P0AA6

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information Electrical Diagrams.

Normal Operation

With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the key was cycled to ON), the Battery Control Module - High Voltage Traction Battery (BCM-HVTB) monitors the electrical isolation (leakage resistance) between the high-voltage system and the vehicle chassis. A resistance value of less than 190,000 ohms (for 10 seconds or greater) is a failure. The normal resistance value is between 950,000-1,330,000 ohms.

- DTC P0AA6 (Hybrid Battery Voltage System Isolation Fault)- If the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) detects a high-voltage system leakage of less than 190,000 ohms for 10 seconds or greater or if the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) detects a high-voltage system leakage of less than 66,000 ohms (with no time frame), the vehicle will not restart and the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) will set this DTC.

This pinpoint is intended to diagnose the following:

- DC/DC converter wiring harness (high voltage)

- DC/DC converter

- High-voltage cables

- High Voltage Traction Battery (HVTB)

- Electronically Controlled Continuously Variable Transmission (eCVT)

- Moisture/water penetration of high-voltage connectors

PINPOINT TEST K : DTC P0AA6

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.

NOTE: If DTC P0A78 or DTC P0A7A is present in the Transmission Control Module (TCM), diagnose those DTCs first. Refer to Computers and Control Systems Information.

K1 MONITOR THE LEAKAGE RESISTANCE PIDs

- Ignition OFF.

- NOTE: Clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs or the vehicle may not start.
Using the scan tool, clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs.


- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) leakage resistance PIDs R_LEAKP and R_LEAKN.

Do the PIDs read less than 190,000 ohms for more than 10 seconds?

Yes
GO to K2.

No
CLEAR the DTCs. REPEAT the self-test. If the DTC is not present at this time, INSPECT the high-voltage system for any physical damage. REPAIR as necessary. RETURN the vehicle to the customer.

K2 CHECK THE HIGH-VOLTAGE DC/DC CONVERTER WIRING HARNESS

- Ignition OFF.

- With the ignition switch in the OFF position, wait for a minimum of 5 minutes.

- Disconnect: Service Disconnect Plug.

- Install a new DC/DC converter wiring harness.

- Connect: Service Disconnect Plug.

- NOTE: Clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs or the vehicle may not start.
Start the engine.


- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) leakage resistance PIDs R_LEAKP and R_LEAKN.

Do the PIDs read less than 190,000 ohms for more than 10 seconds?

Yes
GO to K3.

No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

K3 CHECK THE HVTB (High Voltage Traction Battery) TO TCM (Transmission Control Module) HIGH-VOLTAGE CABLES

- Ignition OFF.

- With the ignition switch in the OFF position, wait for a minimum of 5 minutes.

- Disconnect: Service Disconnect Plug.

- Install a new HVTB (High Voltage Traction Battery) to Transmission Control Module (TCM) high-voltage cable. Refer to High-Voltage Cables .

- Connect: Service Disconnect Plug.

- Using the scan tool, clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs.

- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) leakage resistance PIDs R_LEAKP and R_LEAKN.

Do the PIDs read less than 190,000 ohms for more than 10 seconds?

Yes
GO to K4.

No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

K4 CHECK THE DC/DC CONVERTER

- Ignition OFF.

- With the ignition switch in the OFF position, wait for a minimum of 5 minutes.

- Disconnect: Service Disconnect Plug.

- Install a new DC/DC converter.

- Connect: Service Disconnect Plug.

- Using the scan tool, clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs.

- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) leakage resistance PIDs R_LEAKP and R_LEAKN.

Do the PIDs read less than 190,000 ohms for more than 10 seconds?

Yes
GO to K5.

No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

K5 CHECK THE HVTB (High Voltage Traction Battery)

- Ignition OFF.

- With the ignition switch in the OFF position, wait for a minimum of 5 minutes.

- Disconnect: Service Disconnect Plug.

- Install a new HVTB (High Voltage Traction Battery). Refer to High-Voltage Traction Battery .

- Connect: Service Disconnect Plug.

- Using the scan tool, clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs.

- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) leakage resistance PIDs R_LEAKP and R_LEAKN.

Do the PIDs read less than 190,000 ohms for more than 10 seconds?

Yes
INSTALL a new eCVT (Electronically Controlled Continuously Variable Transmission). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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