Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026PUH |
Model Year Start: 2023 |
Model: Corolla HV |
Prod Date Range: [09/2022 -
] |
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P321E9F; Motor/Generator Shutdown Signal Stuck Off; 2023 - 2025 MY Corolla HV [09/2022 - ] |
DTC
|
P321E9F
|
Motor/Generator Shutdown Signal Stuck Off
|
DTC SUMMARY
MALFUNCTION DESCRIPTION
The hybrid vehicle control ECU detects malfunctions which prevent the inverter with converter assembly emergency shutdown circuit (HSDN) from shutting down the hybrid control system. Detection is performed when the ignition switch is turned to ON and during the shutdown sequence when the ignition switch is turned off.
The cause of this malfunction may be one of the following:
Hybrid vehicle control ECU and inverter with converter assembly shutdown circuit malfunction
-
Hybrid vehicle control ECU malfunction
-
Connector or wire harness malfunction (between hybrid vehicle control ECU and inverter with converter assembly) malfunction
-
Inverter with converter assembly malfunction
DESCRIPTION
The hybrid vehicle control ECU sends a block signal to the motor generator control ECU (MG ECU) to shut down 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 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.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Warning Indicate
|
Note
|
P321E9F
|
Motor/Generator Shutdown Signal Stuck Off
|
When the HV gate block function check is performed (when the ignition switch is turned from ON (READY) to off), the inverter voltage (VH) drops and current flows in the inverter.
(1 trip detection logic)
|
-
Wire harness or connector
-
Hybrid vehicle control ECU
-
Inverter with converter assembly
|
Does not come on
|
Master Warning:
Comes on
|
SAE Code:
P321E
|
CONFIRMATION DRIVING PATTERN
HINT:
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
Connect the GTS to the DLC3.
-
Turn the ignition switch to ON and turn the GTS on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for 2 minutes or more.
-
Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
-
Turn the ignition switch off and wait for 2 minutes or more.
-
Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
-
Turn the ignition switch off and wait for 2 minutes or more.
-
Turn the ignition switch to ON and turn the GTS on.
-
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
-
If the judgment result shows NORMAL, the system is normal.
-
If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result shows INCOMPLETE, perform driving pattern again.
WIRING DIAGRAM
Refer to the wiring diagram for the Shut Down Signal Circuit.
Click here
CAUTION / NOTICE / HINT
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
Click here
HINT:
-
P321E9F may be output as a result of the malfunction indicated by the DTCs in table below.
-
The chart above is listed in inspection order of priority.
-
Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
Malfunction Content
|
Relevant DTC
|
Sensor and actuator circuit malfunction
|
P33B99F
|
Motor/Generator Shutdown Signal (Hybrid/EV Side) Stuck Off
|
P33BF9F
|
Motor/Generator Shutdown Signal (MG Side) Stuck Off
|
PROCEDURE
1.
|
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
|
Click here
NG |
|
CONNECT SECURELY
|
OK
|
|
|
2.
|
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
|
Click here
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
|
B |
|
CONNECT SECURELY
|
C |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
A
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
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.
(b) Disconnect the inverter with converter assembly connector.
(c) Disconnect the hybrid vehicle control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A155-26 (HSDN) - A161-9 (HSDN)
|
Ignition switch off
|
Below 1 Ω
|
A155-26 (HSDN) or A161-9 (HSDN) - Body ground and other terminals
|
Ignition switch off
|
10 kΩ or higher
|
HINT:
As there might be an intermittent malfunction, inspect the following items even if the measured resistance is as specified.
Check that each connector between the inverter with converter assembly and hybrid vehicle control ECU is not loose or disconnected.
(e) Reconnect the hybrid vehicle control ECU connector.
(f) Reconnect the inverter with converter assembly connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
4.
|
CHECK INVERTER WITH CONVERTER ASSEMBLY
|
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
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.
(b) Disconnect the inverter with converter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A155-26 (HSDN) - A155-4 (GND1)
|
Ignition switch off
|
2.65 to 3.55 kΩ
|
NOTICE:
Be sure not to damage or deform the terminal being inspected.
|
|
*a
|
Component without harness connected
(Inverter with Converter Assembly)
|
|
|
(d) Reconnect the inverter with converter assembly connector.
|