DTC P0A09-591: DC / DC Converter Status Circuit Low Input [10/2015 - ]: Procedure

See step  3

NG 

CONNECT SECURELY 

OK 

See step  2

See step  4

NG 

CONNECT SECURELY 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Item	Content
   Terminal	A67-16 (VLO) - D135-6 (E1)
   Equipment Setting	5 V/DIV., 50 ms/DIV.
   Condition	Power switch on (IG)

   OK

   The waveform appears as shown in the illustration.

   HINT: 

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

NG 

See step  7

OK 

See step  4

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 the DTCs and freeze frame data.
5. Turn the power switch off.

NEXT 

See step  5

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (READY).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check for DTCs.

   Result

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

5. Turn the power switch off.

B 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

(Refer to COMPONENTS [10/2015 - ] )

A 

See step  6

(Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2014 - ] )

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

(Refer to COMPONENTS [10/2015 - ] )

NG 

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

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 otherwise instructed because this may cause a malfunction.

2. Disconnect the A49 inverter with converter assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A49-6 (VLO) - Body ground	Power switch off	370 to 430 kΩ

4. Reconnect the A49 inverter with converter assembly connector.

OK 

REPLACE INVERTER WITH CONVERTER ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

NG 

See step  8

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 otherwise instructed because this may cause a malfunction.

2. Disconnect the A49 inverter with converter assembly connector.
3. Disconnect the A67 hybrid vehicle control ECU assembly connector.
4. Measure the resistance according to the value (s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A49-6 (VLO) - A67-16 (VLO)	Power switch off	Below 1 Ω
   A49-6 (VLO) or A67-16 (VLO) - Body ground and other terminals	Power switch off	10 kΩ or higher

5. Reconnect the A49 inverter with converter assembly connector.
6. Reconnect the A67 hybrid vehicle control ECU assembly connector.

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

(Refer to COMPONENTS [10/2015 - ] )

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR