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

1. Turn the ignition switch to ON.
2. Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.
   Fig 1: Checking Hybrid Vehicle Control ECU With Waveform Reference

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Contents
   Terminal	A65-11 (VLO) - D72-6 (E1)
   Equipment Setting	5 V/DIV., 50 ms/DIV.
   Condition	Ignition switch ON

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Hybrid Vehicle Control ECU)

   OK

   The waveform appears as shown in the illustration.

   HINT: 

   • Perform this inspection with the hybrid vehicle control ECU connector connected.
3. Turn the ignition switch off.

NG → See step   5 

OK: Go to next step 

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result		Proceed to
   DTC P0A10-592 is not output.		A
   DTC P0A10-592 is output again.		B

5. Turn the ignition switch off.

B → See step   9 

A: 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   9 

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

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

2. Disconnect the A64 connector from the inverter with converter assembly.
3. Disconnect the A65 connector from the hybrid vehicle control ECU.
4. Turn the ignition switch to ON.
5. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Inverter With Converter - Hybrid Vehicle Control ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A64-4 (VLO) or A65-11 (VLO) - Body ground	Ignition switch ON	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Inverter with Converter Assembly)
   *b	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   NOTE:

   Turning the ignition switch to ON with the inverter with converter assembly connector and the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the ignition switch off.
7. Connect the inverter with converter assembly connector.
8. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the hybrid vehicle control ECU. Refer to REMOVAL .

NEXT: Go to next step 

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   DTC P0A10-592 is not output.	A
   DTC P0A10-592 is output again.	B

5. Turn the ignition switch off.

B → See step   10 

A → COMPLETED