P321E-318

DTC Code	DTC Name
P321E-318	All HV Gate Blocking Range/Performance

DESCRIPTION

The hybrid vehicle control ECU assembly sends a block signal to the motor generator control ECU (MG ECU) to shutdown the power supply to the motor. When the system is not in the on (READY) state, it sends an HSDN (MG shutdown signal) signal from the hybrid vehicle control ECU assembly to the motor generator control ECU (MG ECU) to check the function of the HV gate block. When a malfunction is detected in the HV gate block function, DTCs are stored.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P321E	318	An open or ground short in the HV gate block signal circuit when the gate is operating When the HV gate block function is being checked, inverter voltage (VH) drops or current flows in the inverter. (Both the motor (MG2) and the generator (MG1) are malfunctioning.)	Wire harness or connector Hybrid vehicle control ECU assembly Inverter with converter assembly

WIRING DIAGRAM


*1	to INV Fuse
*2	Inverter with Converter Assembly
*3	Hybrid Vehicle Control ECU Assembly

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 CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY 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 assembly 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 power switch 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

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.

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

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 A14 inverter with converter assembly connector.
Disconnect the A79 hybrid vehicle control ECU assembly connector.

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A79-12 (HSDN) or A14-40 (HSDN) - Body ground and other terminals	Power switch off	10 kΩ or higher
A79-12 (HSDN) - A14-40 (HSDN)	Power switch off	Below 1 Ω

Reconnect the A79 hybrid vehicle control ECU assembly connector.
Reconnect the A14 inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK INVERTER WITH CONVERTER ASSEMBLY

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 A14 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	Condition	Specified Condition
A14-40 (HSDN) - A14-10 (GND1)	Power switch off	2.65 to 3.55 kΩ

Reconnect the A14 inverter with converter assembly connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

NG

REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

HYBRID CONTROL SYSTEM, Diagnostic DTC:P321E-318