DTC P2519-766: A/C Request "A" Circuit: 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 P0AE6-225 is also output.

YES → See step   9 

NO: Go to next step 

1. Turn the power switch off and remove the service plug grip. Refer to PRECAUTION .
   Fig 1: Identifying Battery Smart Unit Connector Terminal Identification & Waveform

   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.

2. Connect an oscilloscope between the battery smart unit terminals specified in the table below, and measure the waveform.

   Item	Contents
   Terminal	IDH (n2-4) - GND (n2-5)
   Equipment Setting	2 V/DIV, 2 ms./DIV
   Condition	Power switch on (IG)

   Result

   The waveform appears as shown in the illustration.

   HINT: 

   • For the removal and installation procedures related to inspection of the waveform of the battery smart unit. Refer to REMOVAL .
   • The frequency of the waveform differs (100 to 900 kHz, 8 to 14 V) depending on operation conditions of the cooling fan of the hybrid vehicle converter (DC/DC converter).

OK → See step   7 

NG: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
   Fig 2: Identifying n4 Hybrid Vehicle Converter (DC/DC Converter) Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the service plug grip is not installed.
3. Disconnect the n4 hybrid vehicle converter (DC/DC converter) connector. Refer to REMOVAL .
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   IDH (n4-5) - Body ground	4.5 to 5.5 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle converter (DC/DC converter) connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

OK → See step   8 

NG: Go to next step 

1. Check that the service plug grip is not installed.
   Fig 3: Identifying Battery Smart Unit Connector Terminal End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the connection of the battery smart unit connector.

   OK

   The connector is connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
   Fig 4: Identifying n2 Battery Smart Unit Connector Terminal identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the service plug grip is not installed.
3. Disconnect the n2 battery smart unit connector. Refer to REMOVAL
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   IDH (n2-4) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle converter (DC/DC converter) connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

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

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   IDH (n2-4) - IDH (n4-5)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   IDH (n2-4) or IDH (n4-5) - Body ground	10 kΩ or more

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7