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 hybrid vehicle control ECU detects that a safety device (interlock) is operated, such as when the service plug grip, inverter terminal cover or connector cover assembly is removed, it will prohibit hybrid system operation or shut off the system main relay. There are three safety devices in three different locations. The first safety device is located at the service plug grip. The second one is located at the frame wire that is connected to the inverter with converter assembly. The third one is located at the inverter terminal cover where the motor cable is connected to the inverter with converter assembly. If the service plug grip, inverter terminal cover, or frame wire 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 ignition switch is turned on (IG).
The system main relay will be turned off from the next trip after the open is detected until the condition returns to normal.

DTC No.	INF Code	DTC Detection Condition	Trouble Are
P0A0D	350	Either of the following conditions is met: With the vehicle stopped, the service plug grip, inverter terminal cover or another part with a safety device was removed. With the vehicle stopped, the interlock signal line became open. (1 trip detection logic)	Wire harness or connector Hybrid vehicle control ECU Service plug grip Inverter with converter assembly Frame wire Inverter terminal cover
P0A0D	351	Interlock signal line opens while the vehicle is being driven (at 5 km/h or more) (1 trip detection logic)

DTC No.

INF Code

DTC Detection Condition

Trouble Are

P0A0D

350

Either of the following conditions is met:

With the vehicle stopped, the service plug grip, inverter terminal cover or another part with a safety device was removed.
With the vehicle stopped, the interlock signal line became open.

(1 trip detection logic)

Wire harness or connector
Hybrid vehicle control ECU
Service plug grip
Inverter with converter assembly
Frame wire
Inverter terminal cover

P0A0D

351

Interlock signal line opens while the vehicle is being driven (at 5 km/h or more)

(1 trip detection logic)

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 ignition 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.

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the ignition switch to ON (IG) and wait for 5 seconds or more.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the ignition switch to 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 also output	B

Turn the ignition switch off.

GO TO DTC CHART (P0A1D) Click here

CLEAR DTC
1. Connect the GTS to the DLC3.
2. Turn the ignition switch to 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 ignition switch off.
NEXT

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the ignition switch to 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 or P0A0D-351 is output again.	B

Turn the ignition switch off.

CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK CIRCUIT) Click here

CHECK SERVICE PLUG GRIP

CAUTION:

Be sure to wear insulated gloves.
1. Text in Illustration
  
  *1 Service Plug Grip
  
  Check if the service plug grip is installed correctly.
  
  Standard
  
  The service plug grip is fully pushed in as shown in the illustration.
  Note
  - Insert the service plug grip until a click sound is heard.
  - If "UNLOCK" is printed on the service plug grip, push in the service plug grip until "UNLOCK" is not visible at all.
  Tech Tips
  - For the removal and installation procedures Click here.
  - P0A0D-350 is also set if the ignition 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 (HYBRID VEHICLE 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 hybrid vehicle control ECU connectors Click here.
  
  OK
  
  The connectors are connected securely and there are no contact pressure problems.
NG
CONNECT SECURELY

OK
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
2. 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 does not pull out.
  
  OK
  
  The connectors are connected securely and there are no contact pressure problems.
  
  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.
NG
CONNECT SECURELY

OK
CHECK INVERTER TERMINAL COVER
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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
2. Check if the inverter terminal cover of the inverter with converter assembly is installed correctly.
  
  OK
  
  The inverter terminal cover is installed correctly.
NG
INSTALL PARTS CORRECTLY

OK
CHECK FRAME WIRE
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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
2. Remove the inverter terminal cover from the inverter with converter assembly.
3. Remove the inverter cover from the inverter with converter assembly.
4. Check if the frame wire P1 is connected correctly.
  
  OK
  
  The frame wire connector is connected correctly.
5. Install the inverter cover.
6. Install the inverter terminal cover.
NG
INSTALL PARTS CORRECTLY

OK

Text in Illustration
*1	Service Plug Grip

Standard
The service plug grip is fully pushed in as shown in the illustration.

Text in Illustration
*A	for LHD
*B	for RHD

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

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

OK
The inverter terminal cover is installed correctly.

OK
The frame wire connector is connected correctly.

CHECK HYBRID VEHICLE 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Disconnect the inverter with converter assembly connector.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch to ON (IG).

Text in Illustration
*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

Tester Connection	Switch Condition	Specified Condition
A33-35 (ILKI) - Body ground	Ignition switch ON (IG)	11 to 14 V

Note

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

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER) 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Disconnect the inverter with converter assembly connector.

Text in Illustration
*a	Component without harness connected (Inverter with Converter Assembly)

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A33-35 (ILKI) - A33-36 (ILKO)	Ignition switch off	10 Ω or less

Note

Do not remove the inverter cover.

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Disconnect the inverter with converter assembly connector.
Install the service plug grip.

Text in Illustration
*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

Tester Connection	Switch Condition	Specified Condition
A33-36 (ILKO) - Body ground	Ignition switch off	Less than 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 matter has not entered the connection, and there is no evidence of contamination.
OK
REPLACE HYBRID VEHICLE CONTROL ECU Click here

NG
REPAIR OR REPLACE CONNECTOR
CHECK SERVICE PLUG GRIP
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 matter has not entered the connection, and there is no evidence of contamination.
3. Text in Illustration
  
  *1 Service Plug Grip
  
  Install the service plug grip.
  Note
  - Insert the service plug grip until a click sound is heard.
  - If "UNLOCK" is printed on the service plug grip, push in the service plug grip until "UNLOCK" is not visible at all.
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 ignition switch to 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
INSTALL PARTS CORRECTLY

OK

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

Text in Illustration
*1	Service Plug Grip

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

Text in Illustration
*1	Service Plug Grip

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Disconnect the inverter with converter assembly connector.
Disconnect the service plug connector.

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A33-36 (ILKO) - K35-1 (ILK)	Ignition switch off	Below 1 Ω

Text in Illustration
*a	Front view of wire harness connector (to Inverter with Converter Assembly)
*b	Front view of wire harness connector (to Service Plug Grip)

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.
1. Check that the service plug grip is not installed.
  
  Note
  
  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
2. Remove the inverter terminal cover from the inverter with converter assembly.
3. Check the condition of the inverter terminal cover interlock.
  
  OK
  
  Dirt or foreign matter has not entered the connection, and there is no evidence of contamination.
4. Install the inverter terminal cover.
NG
REPLACE INVERTER TERMINAL COVER Click here

OK
CHECK FRAME WIRE (FRAME WIRE 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
2. Remove the inverter terminal cover from the inverter with converter assembly.
3. Remove the inverter cover from the inverter with converter assembly.
4. Disconnect the frame wire P1 from the inverter with converter assembly.
5. Check the frame wire interlock.
  
  OK
  
  Dirt or foreign matter has not entered the connection, and there is no evidence of contamination.
6. Connect the frame wire to the inverter with converter assembly.
7. Install the inverter cover.
8. Install the inverter terminal cover.
OK
REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

NG
REPLACE FRAME WIRE Click here

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER)

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
Disconnect the inverter with converter assembly connector.

Text in Illustration
*a	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)
*b	Front view of wire harness connector (to Inverter with Converter Assembly)

Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
A27-13 (ILK) - A33-35 (ILKI)	Ignition switch off	Below 1 Ω

Connect the hybrid vehicle control ECU connector.
Connect the inverter with converter assembly connector.

REPLACE HYBRID VEHICLE CONTROL ECU Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR