HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P33B99F; Motor/Generator Shutdown Signal (Hybrid/EV Side) Stuck Off; 2021 - 2022 MY Avalon HV [08/2020

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001RHCM
Model Year Start: 2021	Model: Avalon HV	Prod Date Range: [08/2020 - ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P33B99F; Motor/Generator Shutdown Signal (Hybrid/EV Side) Stuck Off; 2021 - 2022 MY Avalon HV [08/2020 - ]

DTC

P33B99F

Motor/Generator Shutdown Signal (Hybrid/EV Side) 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 power switch is turned on (IG) and during the shutdown sequence when the power switch is turned off. If any of the following condition is detected, this DTC will be stored. If the following conditions are not detected, DTC P321E9F will be stored.

Hybrid vehicle control ECU malfunction

DESCRIPTION

Refer to the description for DTC P321E9F.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P33B99F

Motor/Generator Shutdown Signal (Hybrid/EV Side) Stuck Off

When the HV gate shutdown function check is performed (when the power switch is turned from on (READY) to off) and checked at the motor generator control ECU (MG ECU), the shutdown signals sent by the main CPU and sub CPU of the hybrid vehicle control ECU do not match.

(1 trip detection logic)

Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on

Related Data List

DTC No.	Data List
P33B99F	-

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.

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Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (READY) and wait for 30 seconds or more.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (READY) and wait for 30 seconds or more.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream 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 or N/A, perform driving pattern again.

PROCEDURE

1.	REPLACE HYBRID VEHICLE CONTROL ECU

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END