DTC P0AE0-228: EV Battery Negative Contactor Control Circuit High: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / EV / Data List / SMRG Status.
4. Read the Data List.

   OK

   Techstream Display	Switch Condition	Specified Condition
   SMRG Status	Power switch on (IG)	OFF

5. Turn the power switch off.

NG → See step   4 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK → See step   11 

1. Turn the power switch on (IG).
2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Measuring Voltage Of Power Management Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) - Body ground	Power switch on (IG)	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

3. Turn the power switch off.

NG → See step   6 

OK: Go to next step 

OK → See step   10 

NG → CONNECT SECURELY 

1. Disconnect the power management control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Measuring Resistance Of Power Management Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) - Body ground	Power switch off 20°C (68°F)	30.6 to 37.4 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

3. Reconnect the power management control ECU connector.

NG → See step   8 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Remove the AM2, IG2, RDI and BATT FAN fuses from the No. 1 motor compartment relay block.
3. Remove the IGCT No. 3 fuses from the No. 2 motor compartment relay block.
   Fig 3: Identifying AM2, IG2, RDI & BATT FAN Fuses On No. 1 Motor Compartment Relay Block & IGCT No. 3 Fuse On No. 2 Motor Compartment Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	No. 1 Motor Compartment Relay Block	*2	AM2 fuses
   *3	RDI fuses	*4	BATT FAN fuses
   *5	IG2 fuses	*6	No. 2 Motor Compartment Relay Block
   *7	IGCT No. 3 fuses	-	-

4. Disconnect the electric vehicle battery assembly connector.
   Fig 4: Identifying Electric Vehicle Battery Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect all the connectors from the power management control ECU.
6. Measure the resistance according to the value(s) in the table below.
   Fig 5: Measuring Resistance Of Power Management Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Rear view of wire harness connector (to Power Management Control ECU)

   -

   -

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) - A23-6 (+B2)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-8 (+B1)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A23-12 (AM22)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-15 (AM21)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-6 (MREL)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-1 (IG2)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - C21-16 (ACCD)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - C21-15 (IG1D)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-2 (IG2D)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - C22-22 (SPDI)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-9 (FANL)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-12 (FCTL)	Power switch off	10 kΩ or higher
   C21-5 (SMRG) - A24-13 (FANH)	Power switch off	10 kΩ or higher

7. Reconnect the power management control ECU connector.
8. Reconnect the electric vehicle battery assembly connector.
9. Install the IGCT No. 3, AM2, IG2, RDI and BATT FAN fuses.

OK → See step   10 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Disconnect the electric vehicle battery assembly connector.
   Fig 6: Identifying Electric Vehicle Battery Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the power management control ECU connector.
4. Measure the resistance according to the value(s) in the table below.
   Fig 7: Measuring Resistance Of Power Management Control ECU - Electric Vehicle Battery Assembly Harness & Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG) - Gi1-15	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   C21-5 (SMRG)and Gi1-15 - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)
   *b	Front view of wire harness connector (to Electric Vehicle Battery Assembly)

5. Reconnect the power management control ECU connector.
6. Reconnect the electric vehicle battery assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Disconnect the electric vehicle battery assembly connector.
   Fig 8: Identifying Electric Vehicle Battery Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.
   Fig 9: Measuring Resistance Of Electric Vehicle Battery Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   Gi1-40 - Body ground	Power switch off	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Electric Vehicle Battery Assembly)

4. Reconnect the electric vehicle battery assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12 

1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

NEXT → See step   13