HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A08-264

DTC Code	DTC Name
P0A08-264	DC / DC Converter Status Circuit

DESCRIPTION

For a description of the hybrid vehicle converter (DC/DC converter), Click here.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A08	264	Malfunction in the hybrid vehicle converter	Wire harness or connector HV battery junction block Electric battery fuse Hybrid vehicle converter Hybrid vehicle control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

CAUTION:

Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

CHECK DTC OUTPUT (HV)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

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

GO TO DTC CHART Click here

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
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

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

CHECK FRAME WIRE (ENGINE ROOM NO. 1 JUNCTION BLOCK SIDE)

CAUTION:

Be sure to wear insulated gloves.

Turn the power switch off.
Remove the service plug grip. Click here

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.
Check the connection of the frame wire terminal (engine room No. 1 junction block side).

OK

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

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

Check for arc marks on the frame wire terminals (engine room No. 1 junction block 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

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CONNECT SECURELY

CHECK FUSES
1. Measure the resistance of the headlight system, A/C blower system, defogger system, stop light system and power window system fuses.
  
  OK
  
  Below 1 Ω
  
  Tech Tips
  
  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
CHECK CONNECTOR CONNECTION CONDITION (NO. 2 BATTERY PACK WIRE CONNECTOR)
1. Check the connection of the No. 2 battery pack wire connector.
  
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Tech Tips
  
  For the removal and installation procedures related to inspection of the connection of the No. 2 battery pack wire connector, Click here.
NG
CONNECT SECURELY

OK

OK
Below 1 Ω

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

CHECK HARNESS AND CONNECTOR (RESISTANCE VALUE OF NODD INSIDE HYBRID VEHICLE CONTROL ECU)

Disconnect the No. 2 battery pack wire connector.

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

Standard resistance

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

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 BATTERY PACK WIRE CONNECTOR) Click here

CHECK FRAME WIRE (NO. 2 FUSIBLE LINK BLOCK ASSEMBLY SIDE)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
Check the connection of the frame wire terminal (No. 2 fusible link block assembly side).

OK

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

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

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

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CONNECT SECURELY

CHECK HV CONVERTER (AMD TERMINAL CONNECTION CONDITION)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
Check the connection of the AMD terminal (hybrid vehicle converter side).

OK

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

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

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

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CONNECT SECURELY

CHECK HV CONVERTER (INSTALLATION CONDITION)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
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.

Torque

Bolts

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

Torque

Nuts

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

Torque
Bolts
20 Nm (204 kgfcm, 15 ft.*lbf)

Torque
Nuts
7.5 Nm (77 kgfcm, 66 in.*lbf)

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

Tech Tips

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

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

CONNECT SECURELY

CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK CONNECTOR)
CAUTION:

Be sure to wear insulated gloves.
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.
  
  Tech Tips
  
  For the removal and installation procedures related to inspection of the connections of the high-voltage connectors for the hybrid vehicle converter, Click here.
  
  OK
  
  The connectors are connected securely and there are no contact problems.
NG
CONNECT SECURELY

OK
CHECK HV BATTERY JUNCTION BLOCK (ELECTRIC BATTERY FUSE)
CAUTION:

Be sure to wear insulated gloves.
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.
  
  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 Click here

OK
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER CONNECTOR)
CAUTION:

Be sure to wear insulated gloves.
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. 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.
  
  Tech Tips
  
  For the removal and installation procedures related to inspection of the connection of the low voltage connector of the hybrid vehicle converter, Click here.
NG
CONNECT SECURELY

OK

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

OK
There is no open circuit in the fuse.

Specified Condition
T= 4.5 Nm {46 kgfcm, 40 in.*lbf}

CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE CONNECTOR - HYBRID VEHICLE CONVERTER)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
Disconnect the low voltage connector from the hybrid vehicle converter.

Tech Tips

For the removal and installation procedures related to the low voltage connector of the hybrid vehicle converter, Click here.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT HV CONVERTER

Connect all the disconnected connectors.
Install the service plug grip.
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)

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

REPLACE HV CONVERTER Click here

CHECK FOR INTERMITTENT PROBLEMS
1. Check for intermittent problems Click here.
NG
REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK

REPLACE HV CONVERTER Click here

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 BATTERY PACK WIRE CONNECTOR)

Disconnect connector A76 from the hybrid vehicle control ECU.
Turn the power switch on (IG).

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

Tech Tips

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
A76-26 (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.

Turn the power switch off.

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

Standard resistance (Check for open)

Tester Connection	Switch Condition	Specified Condition
A76-26 (NODD) - nS1-14 (NODD)	Power switch off	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Switch Condition	Specified Condition
A76-26 (NODD) or nS1-14 (NODD) - Body ground and other terminals	Power switch off	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE HYBRID VEHICLE CONTROL ECU Click here