DTC P0A09-591: DC / DC Converter Status Circuit Low Input [11/2014 - ]: Procedure

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Connect an oscilloscope between the power management control ECU terminals specified in the table below.
2. Turn the power switch on (IG).
3. Measure the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Content
   Terminal	A21-11 (VLO) - L5-6 (E1)
   Equipment Setting	5V/DIV., 50ms./DIV.
   Condition	Power switch on (IG)

   TEXT IN ILLUSTRATION
   
   

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

   OK

   The waveform appears as shown in the illustration.

   HINT: 

   • Perform this inspection with the power management control ECU connector connected.
4. Turn the power switch off.

NG → See step   7 

OK: Go to next step 

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

NEXT: Go to next step 

1. Turn the power switch on (READY).
2. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
3. Check if DTCs are output.

   Result

   Result	Proceed to
   DTC P0A09-591 is not output.	A
   DTC P0A09-591 is output again.	B

4. Turn the power switch off.

B → See step   9 

A: Go to next step 

Refer to CHECK FOR INTERMITTENT PROBLEMS [11/2014 - ]

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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

2. Disconnect connector A59 from the inverter with converter assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A59-3 (VLO) - Body ground	Power switch off	370 to 430 kΩ

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Inverter with Converter Assembly)

4. Connect the inverter with converter assembly connector.

NG → See step   8 

OK → See step   10 

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 manual because this may cause a malfunction.

2. Disconnect connector A59 from the inverter with converter assembly.
3. Disconnect connector A21 from the power management control ECU.
4. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A59-3 (VLO) - A21-11 (VLO)	Power switch off	Below 1 Ω
   A59-3 (VLO) or A21-11 (VLO) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

5. Connect the inverter with converter assembly connector.
6. Connect the power management control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9