HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A0D-350, P0A0D-351

DTC Code	DTC Name
P0A0D-350	High Voltage System Inter-Lock Circuit High
P0A0D-351	High Voltage System Inter-Lock Circuit High

DESCRIPTION

When the power management control ECU detects that a safety device is operated, it will prohibit hybrid system operation or shut off the system main relay. The 4 safety devices are located as follows: 1 in the service plug grip; and at the inverter with converter assembly, there is 1 on the connector cover assembly for the EV fuse, 1 on the inverter terminal cover for the terminals of the motor cable and generator cable and 1 in the No. 4 floor wire (air conditioning harness)*1 or air conditioning harness*2. If the service plug grip, connector cover assembly, inverter terminal cover, No. 4 floor wire (air conditioning harness)*1 or air conditioning harness*2 is removed, the interlock signal line will be open. If the vehicle is being driven, this condition will be determined to be an open circuit and the system main relays will not be shut off. If the safety devices are re-installed correctly, the system will return to normal when the power switch is turned on (IG).

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A0D	350	Operating any of the safety devices with the vehicle stopped (ILK signal is ON) and turning the power switch on (IG)	Wire harness or connector Power management control ECU Service plug grip Inverter with converter assembly No. 4 floor wire (air conditioning harness)1 Air conditioning harness2 Inverter terminal cover
P0A0D	351	Interlock signal line opens (ILK signal is ON) while the vehicle is being driven

*1: for LHD
*2: for RHD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 removing 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 Click here.

Tech Tips

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

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0A0D only is output.	A
P0A1D is output.	B

Turn the power switch off.

GO TO DTC CHART (P0A1D) Click here

CLEAR DTC
1. Connect the GTS to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read and record the DTCs and freeze frame data.
5. Clear DTCs and freeze frame data.
6. Turn the power switch off.
NEXT

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0A0D-350 or P0A0D-351 is output again.	A
Neither P0A0D-350 nor P0A0D-351 is output again.	B

Turn the power switch off.

CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK CIRCUIT) Click here

CHECK SERVICE PLUG GRIP

CAUTION:

Be sure to wear insulated gloves.
1. Check if the service plug grip is installed correctly.
  
  OK
  
  The service plug grip is installed correctly.
  Tech Tips
  - For the removal and installation procedures Click here.
  - P0A0D-350 is also stored if the power switch is turned on (IG) with the service plug grip removed. Confirm the conditions when the malfunction occurred.
NG
INSTALL PARTS CORRECTLY

OK
CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)
1. Text in Illustration
  
  *A for LHD
  
  *B for RHD
  
  Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.
  
  OK
  
  The connectors are connected securely and there are no contact pressure problems.
NG
CONNECT SECURELY

OK

OK
The service plug grip is installed correctly.

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

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

CAUTION:

Be sure to wear insulated gloves.

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.

Check the connector connections and contact pressure of the low voltage connectors of the inverter with converter assembly Click here.

Note

Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector cannot be pulled out.

Text in Illustration
*A	for LHD	*B	for RHD

OK:

The connector is connected securely.
The terminals are not deformed and are connected securely.
No water or foreign matter in the connector.

Tech Tips

When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

Result:
Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK INVERTER TERMINAL COVER

CAUTION:

Be sure to wear insulated gloves.

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.

Text in Illustration
*A	for LHD
*B	for RHD

for Type A:

Check if the inverter terminal cover of the inverter with converter assembly is installed correctly.

OK

The inverter terminal cover is installed correctly.

OK
The inverter terminal cover is installed correctly.

Text in Illustration
*A	for LHD
*B	for RHD

for Type B:

Check if the inverter terminal cover of the inverter with converter assembly is installed correctly.

OK

The inverter terminal cover is installed correctly.

OK
The inverter terminal cover is installed correctly.

INSTALL PARTS CORRECTLY

CHECK CONNECTOR COVER ASSEMBLY

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. Text in Illustration
  
  *A for LHD
  
  *B for RHD
  
  Check if the connector cover assembly of the inverter with converter assembly is installed correctly.
  
  OK
  
  The connector cover assembly is installed correctly.
NG
INSTALL PARTS CORRECTLY

OK
CHECK CONNECTOR CONNECTION CONDITION
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. for LHD:
  1. Check if the No. 4 floor wire (air conditioning harness) is connected correctly.
    
    OK
    
    The No. 4 floor wire (air conditioning harness) connector is connected correctly.
3. for RHD:
  1. Check if the air conditioning harness is connected correctly.
    
    OK
    
    The air conditioning harness connector is connected correctly.
NG
INSTALL PARTS CORRECTLY

OK

OK
The connector cover assembly is installed correctly.

OK
The No. 4 floor wire (air conditioning harness) connector is connected correctly.

OK
The air conditioning harness connector is connected correctly.

CHECK POWER MANAGEMENT CONTROL ECU

CAUTION:

Be sure to wear insulated gloves.

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.
Disconnect the connector from the inverter with converter assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*A	for LHD
*B	for RHD
*a	Front view of wire harness connector (to Inverter with Converter Assembly)

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

Standard Voltage

for LHD
Tester Connection	Switch Condition	Specified Condition
A38-35 (ILKI) - Body ground	Power switch on (IG)	11 to 14 V

for RHD
Tester Connection	Switch Condition	Specified Condition
A74-35 (ILKI) - Body ground	Power switch on (IG)	11 to 14 V

Note

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

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Connect the inverter with converter assembly connector.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - POWER MANAGEMENT CONTROL ECU) Click here

CHECK INVERTER WITH CONVERTER ASSEMBLY (INTERLOCK)

CAUTION:

Be sure to wear insulated gloves.

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.
Disconnect the connector from the inverter with converter assembly.

Text in Illustration
*A	for LHD
*B	for RHD
*a	Component without harness connected (Inverter with Converter Assembly)

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

Standard Resistance

for LHD
Tester Connection	Switch Condition	Specified Condition
A38-35 (ILKI) - A38-24 (ILKO)	Power switch off	Less than 10 Ω

for RHD
Tester Connection	Switch Condition	Specified Condition
A74-35 (ILKI) - A74-24 (ILKO)	Power switch off	Less than 10 Ω

Note

Do not remove the inverter terminal cover, connector cover assembly and No. 4 floor wire (air conditioning harness)*1 or air conditioning harness*2.

*1: for LHD
*2: for RHD

Connect the inverter with converter assembly connector.

CHECK INVERTER TERMINAL COVER Click here

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - BODY GROUND)

CAUTION:

Be sure to wear insulated gloves.

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.
Disconnect the connector from the inverter with converter assembly.
Install the service plug grip.

Text in Illustration
*A	for LHD
*B	for RHD
*a	Front view of wire harness connector (to Inverter with Converter Assembly)

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

Standard Resistance

for LHD
Tester Connection	Switch Condition	Specified Condition
A38-24 (ILKO) - Body ground	Power switch off	Below 1 Ω

for RHD
Tester Connection	Switch Condition	Specified Condition
A74-24 (ILKO) - Body ground	Power switch off	Below 1 Ω

Remove the service plug grip.
Connect the inverter with converter assembly connector.

CHECK SERVICE PLUG GRIP Click here

CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK CIRCUIT)
1. Check the connections of each connector.
  
  OK
  
  Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.
OK
REPLACE POWER MANAGEMENT CONTROL ECU Click here

NG
REPAIR OR REPLACE CONNECTOR
CHECK SERVICE PLUG GRIP

CAUTION:

Be sure to wear insulated gloves.
1. Remove the service plug grip.
2. Text in Illustration
  
  *1 Service Plug Grip
  
  Check the condition of the service plug grip interlock.
  
  OK
  
  Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.
NG
REPLACE SERVICE PLUG GRIP Click here

OK
CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK 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. Text in Illustration
  
  *1 Interlock Connector
  
  Check that the interlock connector at the service plug grip installation socket is connected correctly.
  
  OK
  
  The connector is connected correctly.
NG
CONNECT SECURELY

OK

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - SERVICE PLUG GRIP)

CAUTION:

Be sure to wear insulated gloves.

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.
Disconnect the connector from the inverter with converter assembly.
Disconnect the connector from the service plug.

Text in Illustration
*A	for LHD
*B	for RHD
*a	Front view of wire harness connector (to Inverter with Converter Assembly)
*b	Rear view of wire harness connector (to Service Plug Grip)

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

Standard Resistance

for LHD
Tester Connection	Switch Condition	Specified Condition
A38-24 (ILKO) - m2-1 (ILK)	Power switch off	Below 1 Ω

for RHD
Tester Connection	Switch Condition	Specified Condition
A74-24 (ILKO) - m2-1 (ILK)	Power switch off	Below 1 Ω

Connect the service plug grip connector.
Connect the inverter with converter assembly connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (SERVICE PLUG GRIP - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - SERVICE PLUG GRIP)

CHECK INVERTER TERMINAL COVER

CAUTION:

Be sure to wear insulated gloves.

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.

Text in Illustration
*A	for LHD
*B	for RHD

for Type A:

Remove the inverter terminal cover from the inverter with converter assembly.

Text in Illustration
*A	for LHD
*B	for RHD

for Type B:

Remove the inverter terminal cover from the inverter with converter assembly.

Text in Illustration
*A	for LHD
*B	for RHD
*1	Inverter Terminal Cover

Check the condition of the inverter terminal cover interlock.

OK
Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.

Install the inverter terminal cover to the inverter with converter assembly.

REPLACE INVERTER TERMINAL COVER Click here

CHECK CONNECTOR COVER ASSEMBLY

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. Text in Illustration
  
  *A for LHD
  
  *B for RHD
  
  Remove the connector cover assembly from the inverter with converter assembly.
3. Text in Illustration
  
  *1 Connector Cover Assembly
  
  Check the condition of the connector cover assembly interlock.
  
  OK
  
  Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.
  
  Tech Tips
  
  The connector cover assembly is not available separately. If it requires replacement, replace the inverter with converter assembly.
4. Install the connector cover assembly to the inverter with converter assembly.
NG
REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

OK

CHECK HARNESS AND CONNECTOR

CAUTION:

Be sure to wear insulated gloves.

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.

for LHD:

Disconnect the No. 4 floor wire (air conditioning harness) from the inverter with converter assembly.

Check the No. 4 floor wire (air conditioning harness) interlock.

OK
Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.

Text in Illustration
*1	No. 4 Floor Wire (Air Conditioning Harness)

Connect the No. 4 floor wire (air conditioning harness) to the inverter with converter assembly.

for RHD:

Disconnect the air conditioning harness from the inverter with converter assembly.

Check the air conditioning harness interlock.

OK
Dirt or foreign objects have not entered the connection, and there is no evidence of contamination.

Text in Illustration
*1	Air Conditioning Harness

Connect the air conditioning harness to the inverter with converter assembly.

Result

Result	Proceed to
OK	A
NG (for LHD)	B
NG (for RHD)	C

REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

REPLACE NO. 4 FLOOR WIRE Click here

REPLACE AIR CONDITIONING HARNESS

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

CAUTION:

Be sure to wear insulated gloves.

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.
Disconnect the connector from the inverter with converter assembly.
Disconnect the connector from the power management control ECU.

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

Standard Resistance

for LHD
Tester Connection	Switch Condition	Specified Condition
A38-35 (ILKI) - A35-22 (ILK)	Power switch off	Below 1 Ω

for RHD
Tester Connection	Switch Condition	Specified Condition
A74-35 (ILKI) - A35-22 (ILK)	Power switch off	Below 1 Ω

Text in Illustration
*A	for LHD
*B	for RHD
*a	Front view of wire harness connector (to Inverter with Converter Assembly)
*b	Rear view of wire harness connector (to Power Management Control ECU)

Connect the power management control ECU connector.
Connect the inverter with converter assembly connector.

REPLACE POWER MANAGEMENT CONTROL ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR