Up to 08/2009

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A79-703: Drive Motor "B" Inverter Performance
P0A79-703 - Drive Motor "B" Inverter Performance

DESCRIPTION

The inverter contains a three-phase bridge circuit, which consists of six power transistors (IGBTs) each for MG1, MG2 and MGR. The inverter converts high-voltage direct current from the HV battery into three-phase alternating current for MG1, MG2 and MGR; it also converts three-phase alternating current supplied by MG1, MG2 and MGR into direct current for the HV battery. The MG ECU controls the actuation of the power transistors (IGBTs). The inverter transmits information necessary for control, such as amperage and voltage, to the MG ECU.





The MG ECU uses an inverter voltage sensor, which is built into the inverter, to detect boosted high voltage to allow control of the voltage boost.

The MG ECU monitors the inverter voltage sensor and detects the following malfunctions.

If the inverter receives a rear motor gate shutdown signal from the MG ECU, it will turn all power transistors off which are activating MGR to forcibly stop MGR operation. The MG ECU monitors the rear motor gate shutdown signal line and detects a malfunction.

HINT
The term "drive motor B" indicates MGR.





HINT
- If DTC P0A79-703 is output, the hybrid system cannot be restarted until the DTC is cleared.
- If the malfunction is not reproduced, turn the power switch on (READY) and leave the vehicle for 1 minute with the shift lever in P or N in order to easily reproduce the malfunction.
MONITOR DESCRIPTION

The MG ECU monitors the current to the rear motor. If the current passes to the rear motor while the vehicle stops with the power switch on (IG) or the shift lever in the N position, the MG ECU will detect an abnormality. The power management control ECU (HV CPU) illuminates the MIL and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN

- 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.

- Turn the power switch on (READY) and turn the Techstream on.

- With the vehicle stopped and the shift lever in P, move the shift lever to N for 10 seconds and then move the shift lever back to P.

NOTICE:
Do not leave the vehicle for an extended time with the shift lever in N.

- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

- Check that permanent DTCs are cleared.

- If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE

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 disconnecting 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.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0A1A

NG -- CONNECT SECURELY

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components