DTC P0A10-592: DC / DC Converter Status Circuit High Input: Procedure

1. Connect an oscilloscope between the battery pack wire terminals specified in the table below, and measure the waveform.
   Fig 1: Identifying Battery Pack Wire Connector And Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Contents
   Terminal	VLO (On1-7) - GND (On1-10)
   Equipment Setting	5 V/DIV., 50 ms./DIV.
   Condition	Power switch on (IG)

   HINT: 

   Perform this inspection with the battery pack wire connected.

OK → See step   5 

NG: Go to next step 

1. Disconnect the battery pack wire connector.
   Fig 2: 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 3: Identifying On1 Battery Pack Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   VLO (On1-7) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU 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. Turn the power switch off.
   WARNING:

   Be sure to wear insulated gloves.

2. Turn the power switch off and remove the service plug grip.
   Fig 4: Identifying n4 Hybrid Vehicle Converter(DC/DC Converter) Connector Location

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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.

3. Disconnect the n4 hybrid vehicle converter (DC/DC converter) connector.
4. Measure the voltage according to the value(s) in the table below.
   Fig 5: Identifying N4 Hybrid Vehicle Converter (DC/DC Converter) Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   VLO (On1-7) or VLO (n4-3) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU 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   9 

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 6: Identifying On1 Battery Pack Wire Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   VLO (On1-7) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU 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   8 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Read and record the DTCs and freeze frame data.
4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
5. Clear DTCs and freeze frame data.

NEXT: Go to next step 

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. Read output DTCs.

   Result

   DTC P0A10-592 is output.

YES → See step   8 

NO: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK → See step   8