DTC P0A08-264: DC / DC Converter Status Circuit: Procedure

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. Check if DTCs are output.

   Result

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

   DTC No.	Relevant Diagnosis
   P0A94-124, 125, 126, 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

   HINT: 

   DTC P0A08-264 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

5. Turn the power switch off.

B → See step   25 

A: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connection of the frame wire 1E connector.
   Fig 1: Checking Condition Of The 1E Fame Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check that the bolt for the frame wire terminal is tightened to the specified torque, the frame wire terminal is connected securely, and there are no contact problems.
   Fig 2: Identifying Frame Wire Terminal & Bolt

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   8.4 N*m {85 kgf*cm , 74 in.*lbf }

2. Check for arc marks at the bolts for the frame wire.

   Result

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

NG → CONNECT SECURELY 

OK: Go to next step 

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 service information because this may cause a malfunction.

2. Check that the nuts for the AMD terminals are tightened to the specified torque, the AMD terminals are connected securely, and there are no contact problems.
   Fig 3: Checking AMD Terminals & Nuts

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   Nut A 

   9.0 N*m {92 kgf*cm , 80 in.*lbf }

   Nut B 

   7.5 N*m {76 kgf*cm , 66 in.*lbf }

3. Check for arc marks at the nuts for the AMD terminals.

   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.
   NOTE:

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

2. Check that the hybrid vehicle converter installation nuts and HV battery assembly installation bolts are tightened to the specified torque. Check that the hybrid vehicle converter installation nuts and HV battery assembly installation bolts are connected securely and that there are no contact problems.
   Fig 4: Identifying Hybrid Vehicle Converter & HV Battery Assembly Nut And Bolt

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

   A 

   7.5 N*m {76 kgf*cm , 66 in.*lbf } (Hybrid vehicle converter installation nut)

   B 

   19 N*m {194 kgf*cm , 14 ft.*lbf } (HV battery assembly installation bolt)

   TEXT IN ILLUSTRATION
   
   

   *1

   Hybrid Vehicle Converter

   *2

   HV Battery Assembly

3. Check for arc marks at each hybrid vehicle converter installation nut and HV battery installation 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 body grounded, 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.
   NOTE:

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

2. Disconnect connector z17 from the hybrid vehicle converter.
   Fig 5: Identifying z17 Hybrid Vehicle Converter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.
   Fig 6: Identifying NODD Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z17-2 (NODD) - Body ground	Power switch off	120 to 140 kΩ

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector (to Hybrid Vehicle Converter)

4. Connect the hybrid vehicle converter connector.

NG → See step   18 

OK: Go to next step 

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 service information because this may cause a malfunction.

2. Check the connections of the hybrid battery junction block assembly connectors.
   Fig 7: Checking Connections Of Hybrid Battery Junction Block Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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.
   NOTE:

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

2. Measure the resistance according to the value(s) in the table below.
   Fig 8: Identifying Electric Vehicle Fuse (DC/DC)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   Electric vehicle fuse terminals	Power switch off	Below 1 Ω

NG → REPLACE ELECTRIC VEHICLE FUSE 

OK: Go to next step 

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 service information because this may cause a malfunction.

2. Check that the bolts for the electric vehicle fuse are tightened to the specified torque, the electric vehicle fuse are connected securely, and there are no contact problems.
   Fig 9: Identifying Bolts For Electric Vehicle Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Torque

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

3. Check for arc marks at the bolts for the electric vehicle fuse terminals.

   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.
   NOTE:

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

2. Disconnect connector A58 from the hybrid vehicle control ECU.
3. Disconnect connector z17 from the hybrid vehicle converter.
4. Measure the resistance according to the value(s) in the table below.
   Fig 10: Identifying A58 Hybrid Vehicle Control ECU, z17 Hybrid Vehicle Converter & NODD Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A58-75 (NODD) - z17-2 (NODD)	Power switch off	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Hybrid Vehicle Control ECU)
   *2	Rear view of wire harness connector (to Hybrid Vehicle Converter)

5. Connect the hybrid vehicle converter connector.
6. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the AC/DC 400 A probe of an ammeter to the output cable of the hybrid vehicle converter.
2. Install the service plug grip.
3. Measure the current flowing from the auxiliary battery with the power switch on (READY), the headlight switch and blower motor switch in the HI position, and the rear window defogger turned on.
   Fig 11: Connecting AC/DC 400 A Probe Of Ammeter To Output Cable Of Hybrid Vehicle Converter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Current

   Item	Switch Condition	Specified Condition
   Current flowing from hybrid vehicle converter	Power switch on (READY) (The headlight switch and blower motor switch are in the HI position, and the rear window defogger is turned on.)	60 to 140 A

4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Item	Switch Condition	Specified Condition
   Auxiliary battery voltage	Power switch on (READY) (The headlight switch and blower motor switch are in the HI position, and the rear window defogger is turned on.)	13 to 15 V

5. Turn the power switch off.

NG → See step   19 

OK: Go to next step 

1. Check for intermittent problems. Refer toCHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK: Go to next step 

HINT: 

For details about the hybrid vehicle converter cooling duct, refer to the description for DTC P0A08-101. Refer toDESCRIPTION .

1. Check that the air intake grill of the rear seat side garnish LH is not clogged.

   OK

   The air intake grill is not clogged.

NG → REMOVE FOREIGN OBJECT 

OK: Go to next step 

HINT: 

For details about the hybrid vehicle converter cooling duct, refer to the description for DTC P0A08-101. Refer toDESCRIPTION .

1. Check if the ducts are installed correctly.

   OK

   The ducts are installed correctly.

2. Check the ducts for clogging.

   OK

   The ducts are not clogged.

NG → REPAIR OR REPLACE AIR DUCT (ALL) 

OK → See step   27 

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 service information because this may cause a malfunction.

2. Disconnect connector A58 from the hybrid vehicle control ECU.
3. Disconnect connector z17 from the hybrid vehicle converter.
4. Turn the power switch on (IG).

   HINT: 

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

5. Measure the voltage according to the value(s) in the table below.
   Fig 12: Identifying A58 Hybrid Vehicle Control ECU, z17 Hybrid Vehicle Converter & NODD Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A58-75 (NODD) - Body ground	Power switch on (IG)	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Hybrid Vehicle Control ECU)
   *2	Rear view of wire harness connector (to Hybrid Vehicle Converter)

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	Switch Condition	Specified Condition
   A58-75 (NODD) - z17-2 (NODD)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A58-75 (NODD) or z17-2 (NODD) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   26 

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 service information because this may cause a malfunction.

2. Measure the voltage according to the value(s) in the table below.
   Fig 13: Checking AMD Terminal Voltage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   AMD terminal - Body ground	Power switch off	11 to 14 V

NG → See step   20 

OK → See step   27 

1. Measure the voltage according to the value(s) in the table below.
   Fig 14: Checking Condition Of The 1E Fame Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   1E-1 - Body ground	Power switch off	11 to 14 V

NG → See step   22 

OK: Go to next step 

1. Disconnect connector 1E from the engine room junction block assembly.
   Fig 15: Identifying 1E & 1F Engine Room Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1E-1 - 1F-1	Power switch off	Below 1 Ω

3. Connect the engine room junction block assembly connector.

NG → REPLACE FUSIBLE LINK (DC/DC) 

OK → See step   28 

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   Fusible link block assembly (MAIN)	Always	Below 1 Ω

NG → REPLACE FUSIBLE LINK BLOCK ASSEMBLY (MAIN) 

OK: Go to next step 

1. Turn the power switch off.
2. Check the connection of the auxiliary battery terminal cables.

   OK

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

3. Check for arc marks on the auxiliary battery terminal cables.

   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 are contact problems.	There are arc marks.	B
   The terminals are not connected securely and there are contact problems.	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 according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   Auxiliary negative battery terminal - Body ground	Power switch off	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY NEGATIVE BATTERY TERMINAL - BODY GROUND) 

OK → See step   29