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Home >> Lexus Truck >> 2010 >> RX 450h AWD V6-3.5L (2GR-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A7A >> P0A7A-344 - Generator Inverter Performance >> Up to 08/2009

Up to 08/2009





HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A7A-344: Generator Inverter Performance
P0A7A-344 - Generator 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.





If the MG1 torque execution value does not correspond to the torque command value from the MG ECU to MG1, the power management control ECU (HV CPU) will store this DTC.





MONITOR DESCRIPTION

If the difference between the requested MG1 torque and the actual MG1 torque exceeds a predetermined value, the MG ECU determines that there is a malfunction in the execution or monitoring of MG1 torque. The MG ECU will send information about the malfunction to the power management control ECU (HV CPU). Upon receiving this information, the power management control ECU (HV CPU) will illuminate the MIL and set 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.

- Slowly accelerate from a stop (0 mph (0 km/h)) to 25 mph (40 km/h) several times while using different acceleration patterns.

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

- Check that permanent DTCs are cleared.

- If the permanent DTCs are not cleared, perform a 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 DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:









HINT
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
- P0A7A-344 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
(e) Turn the power switch off.

B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343

NG -- CONNECT SECURELY
OK -- Continue to next step.

3. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) P0A78

C -- CONNECT SECURELY

B -- REPLACE MALFUNCTIONING PARTS
A -- Continue to next step.

4. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1) P0A78

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
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