DTC P0A08-264: DC / DC Converter Status 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

   Result	Proceed to
   P0A08-264 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0A94-127, 547, 548, 549, 550	DC / DC Converter Performance
   P0ADB-227	Hybrid Battery Positive Contactor Control Circuit Low
   P0ADC-226	Hybrid Battery Positive Contactor Control Circuit High
   P0ADF-229	Hybrid Battery Negative Contactor Control Circuit Low
   P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
   P0AE6-225	Hybrid Battery Precharge Contactor Control Circuit Low
   P3004-131, 803	Power Cable Malfunction

B → See step   17 

A: Go to next step 

1. Check the connections of the hybrid vehicle control ECU connectors.

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
2. Remove the service plug grip. Refer to PRECAUTION
   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. Check the connection of the frame wire terminal (No. 1 fusible link block assembly side).
   Fig 1: Frame Wire Terminal (Engine Room No. 1 Junction Block Side)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The terminal is connected securely and there is no contact problem.

4. Check for arc marks on the frame wire terminals (No. 1 fusible link block assembly side and vehicle wire harness side).

   Result

   Result		Proceed to
   The terminals are connected securely and there are no contact problems.	There are no arc marks.	A
   The terminals are not connected securely and there is a contact problem.	There are arc marks.	B
   The terminals are not connected securely and there is a contact problem.	There are no arc marks.	C
   The terminals are connected securely and there are no contact problems.	There are arc marks.	B

C → CONNECT SECURELY 

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A: Go to next step 

1. Measure the resistance of the headlight system fuses, A/C blower system, defogger system, stop light system and power window system.

   OK

   Below 1 Ω

   HINT: 

   If any of the fuses is broken, replace the fuse and repair the shorted circuit.

NG → REPAIR OR REPLACE SHORTED CIRCUIT AND REPLACE BROKEN FUSE 

OK: Go to next step 

1. Check the connection of the No. 2 battery pack wire connector.
   Fig 2: Locating No. 2 Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

   HINT: 

   For the removal and installation procedures related to inspection of the connection of the No. 2 battery pack wire connector. Refer to REMOVAL .

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect the No. 2 battery pack wire connector.
   Fig 3: Locating No. 2 Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 4: Identifying NS1 No. 2 Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   nS1-14 (NODD) - Body ground	Power switch off	120 to 140 kΩ

NG → See step   16 

OK: Go to next step 

1. Check that the service plug grip is not installed.
2. Check the connection of the frame wire terminal (No. 2 fusible link block assembly side).
   Fig 5: Locating Frame Wire Terminal (No. 2 Fusible Link Block Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The terminal is connected securely and there is no contact problem.

3. Check for arc marks on the frame wire terminals (No. 2 fusible link block assembly side and vehicle wire harness side).

   Result

   Result		Proceed to
   The terminals are connected securely and there are no contact problems.	There are no arc marks.	A
   The terminals are not connected securely and there is a contact problem.	There are arc marks.	B
   The terminals are not connected securely and there is a contact problem.	There are no arc marks.	C
   The terminals are connected securely and there are no contact problems.	There are arc marks.	B

C → CONNECT SECURELY 

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A: Go to next step 

1. Check that the service plug grip is not installed.
2. Check the connection of the AMD terminal (hybrid vehicle converter side).
   Fig 6: Locating AMD Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The terminal is connected securely and there is no contact problem.

3. Check for arc marks on the AMD terminals (hybrid vehicle converter side and vehicle wire harness side).

   Result

   Result		Proceed to
   The terminals are connected securely and there are no contact problems.	There are no arc marks.	A
   The terminals are not connected securely and there is a contact problem.	There are arc marks.	B
   The terminals are not connected securely and there is a contact problem.	There are no arc marks.	C
   The terminals are connected securely and there are no contact problems.	There are arc marks.	B

C → CONNECT SECURELY 

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A: Go to next step 

1. Check that the service plug grip is not installed.
2. Check that the HV battery assembly installation bolts are tightened to the specified torque. Check that the HV battery assembly installation bolts are connected securely and that there are no contact problems.
   Fig 7: Locating HV Battery

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   Bolts 

   20 N*m (204 kgf*cm, 15 ft.*lbf)

3. Check that the hybrid vehicle converter installation nuts are tightened to the specified torque. Check that the hybrid vehicle converter installation nuts are connected securely and that there are no contact problems.
   Fig 8: Identifying Hybrid Vehicle Converter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   Nuts 

   7.5 N*m (77 kgf*cm, 66 in.*lbf)

4. Check for arc marks at each nut and bolt.

   Result

   Result		Proceed to
   There are no loose connections or contact problems.	There are no arc marks.	A
   There is a loose connection or contact problem.	There are arc marks.	B
   There is a loose connection or contact problem.	There are no arc marks.	C
   There are no loose connections or contact problems.	There are arc marks.	B

   HINT: 

   Because the hybrid vehicle converter is grounded to the body, DTC P0A08-264 may be set if there are any contact or connection problems.

C → CONNECT SECURELY 

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A: Go to next step 

1. Check that the service plug grip is not installed.
2. Check the connections of the high-voltage connectors for the hybrid vehicle converter that are connected to the HV battery junction block.
   Fig 9: Locating HV Battery Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   For the removal and installation procedures related to inspection of the connections of the high-voltage connectors for the hybrid vehicle converter. Refer to COMPONENTS .

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check that the service plug grip is not installed.
2. Check if there is an open circuit in the electric battery fuse that is installed in the HV battery junction block.
   Fig 10: Checking HV Battery Junction Block (Electric Battery Fuse)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   There is no open circuit in the fuse.

3. Check that the bolts for the electric battery fuse are tightened to the specified torque.

   Specified Condition

   T=4.5 N*m {46 kgf*cm, 40 in.*lbf}

   NOTE:

   Be sure to use a torque wrench to check the tightening torque.

NG → REPLACE ELECTRIC BATTERY FUSE 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   Fig 11: Locating Service Plug Grip

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 12: Locating Service Plug Grip

   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. Check the connection of the low voltage connector of the hybrid vehicle converter.

   OK

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

   HINT: 

   For the removal and installation procedures related to inspection of the connection of the low voltage connector of the hybrid vehicle converter. Refer to COMPONENTS .

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   Fig 13: Identifying NS1 No. 2 Battery Pack Wire Connector And Z82 Hybrid Vehicle Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the low voltage connector from the hybrid vehicle converter.

   HINT: 

   For the removal and installation procedures related to the low voltage connector of the hybrid vehicle converter. Refer to COMPONENTS .

3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   nS1-14 (NODD) - z82-9 (NODD)	Power switch off	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect all the disconnected connectors.
   Fig 14: Inspecting Hybrid Vehicle Converter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Install the service plug grip.
3. Measure the current output from the hybrid vehicle converter with the headlight position switch and blower motor switch in the HI position, and the rear window defogger turned on (*1).
4. Measure the auxiliary battery voltage according to the previous conditions (*1).

   Result

   Item	Condition	Specified Condition
   Current flowing from the hybrid vehicle converter	The headlight position switch and blower motor switch are in the HI position, and the rear window defogger is turned on.	60 to 140 A
   Auxiliary battery voltage	The headlight position switch and blower motor switch are in the HI position, and the rear window defogger is turned on.	13 to 15 V

NG → See step   18 

OK: 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   18 

1. Disconnect connector A74 from the hybrid vehicle control ECU.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.
   Fig 15: Identifying A74 HV Control ECU And NS1 Battery Pack Wire Connector Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A74-26 (NODD) - Body ground	Power switch on (IG)	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.

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

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   A74-26 (NODD) - nS1-14 (NODD)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   A74-26 (NODD) or nS1-14 (NODD) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   19