P0A0D-350

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A0D-350: High Voltage System Inter-Lock Circuit High

DTC P0A0D-350 - High Voltage System Inter-Lock Circuit High

DTC P0A0D-351 - High Voltage System Inter-Lock Circuit High

DESCRIPTION
- When the HV control ECU detects that the fail-safe devices are operated, it will prohibit the hybrid system operation or shut off the system main relay. There are two fail-safe devices in two different locations (HV battery, w/ converter inverter). For the HV battery, by inserting and locking the service plug grip into the interlock switch located on the HV battery, the joining of both the plug grip and the switch forms the fail-safe device. The fail-safe device in the engine compartment is a terminal attached by a bolt on the engine side of the inverter cover. The inverter cover cannot be removed without first removing the terminal and bolt. If the service plug grip or interlock device of the inverter cover is removed, the interlock signal circuit will be open. While the vehicle is being driven, this condition is determined as an open malfunction and the system main relay is not shut off. If the fail-safe devices are installed correctly, the system returns to normal when the ignition switch is turned to the ON position.





WIRING DIAGRAM





INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

PROCEDURE

1. DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTC. Hybrid Control System

Result:
DTC P0A1D is output.
YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CLEAR DTC
(a) Turn the ignition switch to the ON position.
(b) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(c) Clear DTCs and freeze frame data.
NEXT -- Continue to next step.
3. RECONFIRM OUTPUT DTC (HV)
(a) Turn the ignition switch to the ON position.
(b) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(c) Read output DTC. Hybrid Control System

Result:
DTC P0A0D-350 or P0A0D-351 is output again.
NO -- CHECK CONNECTION CONDITION OF INTERLOCK CIRCUIT CONNECTOR (LOOSENESS AND POOR CONTACT)
YES -- Continue to next step.
4. CHECK SERVICE PLUG GRIP
CAUTION: Be sure to wear insulated gloves.





(a) Check if the service plug grip is installed correctly.
OK:
The service plug grip is installed correctly.
NG -- CONNECT SECURELY
OK -- Continue to next step.
5. CHECK INTERLOCK (INVERTER COVER)





(a) Check if the interlock device of the inverter cover is installed correctly.
OK:
The interlock device is installed correctly.
NG -- CONNECT SECURELY
OK -- Continue to next step.
6. INSPECT HYBRID VEHICLE CONTROL ECU





(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.
7. CHECK EV BATTERY PLUG ASSEMBLY
CAUTION: Be sure to wear insulated gloves.





(a) Turn the ignition switch off.
(b) Disconnect the interlock switch connector from the EV battery plug.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





HINT: Perform inspection with the service plug grip installed.

NG -- REPLACE EV BATTERY PLUG ASSEMBLY
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (INTERLOCK (INVERTER COVER) - EV BATTERY PLUG)
CAUTION: Be sure to wear insulated gloves.





(a) Remove the service plug grip. Hybrid Control System

(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - EV BATTERY PLUG)
CAUTION: Be sure to wear insulated gloves.





(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






OK -- REPLACE HYBRID VEHICLE CONTROL ECU
NG -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - VE BATTERY PLUG)
CAUTION: Be sure to wear insulated gloves.





(a) Turn the ignition switch off.
(b) Disconnect the H30 connector from the HV control ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






OK -- REPLACE HYBRID VEHICLE CONTROL ECU
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
11. CHECK CONNECTION CONDITION OF INTERLOCK CIRCUIT CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connections of each connector.
Result:
Dirt or foreign objects have entered the connection, or there are remains of them.
YES -- CONNECT SECURELY
NO -- REPLACE HYBRID VEHICLE CONTROL ECU