DTC P0A10-263: DC / DC Converter Status Circuit High Input: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   DTC P0A10-263 and other DTCs are output.

YES → GO TO  DIAGNOSTIC TROUBLE CODE CHART  DTC CHART 

NO: Go to next step 

1. Disconnect the On1 battery pack wire connector. Refer to REMOVAL .
   Fig 1: Identifying On1 Battery Pack Wire Connector Location

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying On1 Battery Pack Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   NODD (On1-6) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the battery pack wire connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

NG → See step   4 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   Fig 3: Identifying n4 Hybrid Vehicle Converter(DC/DC Converter) Connector Location

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the n4 hybrid vehicle converter (DC/DC converter) connector. Refer to REMOVAL .
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.
   Fig 4: Identifying Battery Pack Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   NODD (On1-6) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the battery pack wire connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

5. Turn the power switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   NODD (On1-6) - Each of the other terminals	10 kΩ or more

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5 

1. Disconnect the A61 hybrid vehicle control ECU connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.
   Fig 5: Identifying On1 Battery Pack Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   NODD (On1-6) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the battery pack wire connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6