Up to 08/2009

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A79-716: Drive Motor "B" Inverter Performance
P0A79-716 - 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.

HINT
The term "drive motor B" indicates MGR.

MONITOR DESCRIPTION

The MG ECU monitors the rear motor inverter electric current. If the current exceeds the threshold for a specified period of time, 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 (IG) and check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

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

- With the shift lever in P, wait for several seconds.

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

- 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.
NOTICE:
- DTC P0A79-716 is stored after any of DTCs P0A79-136, 692, 693, 694, 695, 696, 712, 812, 813 and 814 are stored. After troubleshooting and repairing DTC P0A79-716, be sure to troubleshoot all the other DTCs.
- Depending on the conditions in which the vehicle is being operated when a short circuit occurs in the inverter with converter assembly, the No. 3 frame wire (rear motor cable), extension wire assembly, or rear traction motor with transaxle assembly may be affected. As this DTC is stored if a short circuit occurs in the inverter with converter assembly, perform a road test to check the No. 3 frame wire (rear motor cable), extension wire assembly, and rear traction motor with transaxle assembly. If problems are found, replace the malfunctioning parts.
- After completing the repair, including repairing of previously output DTCs, drive the vehicle at a speed of approximately 25 mph (40 km/h) for 1 minute and check that DTC P0A91-705 (Drive Motor "B" Performance) is not output. If DTC P0A91-705 (Drive Motor "B" Performance) is output, replace the rear traction motor with transaxle assembly.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR) P0A78

NG -- CHECK NO.3 WIRE FRAME (REAR MOTOR CABLE)
OK -- Continue to next step.

2. REPLACE INVERTER WITH CONVERTER ASSEMBLY

(a) Replace the inverter with converter assembly Components.

NEXT -- CHECK DTC OUTPUT

3. CHECK NO.3 WIRE FRAME (REAR MOTOR CABLE) P0A78

NG -- CHECK EXTENSION WIRE ASSEMBLY
OK -- Continue to next step.

4. CHECK EXTENSION WIRE ASSEMBLY P0A78

NG -- CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR)
OK -- Continue to next step.

5. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

(a) Replace the rear traction motor with transaxle assembly Components.

NEXT -- REPLACE INVERTER WITH CONVERTER ASSEMBLY

6. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR)

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

(b) Remove the No. 3 wire frame and extension wire assembly from the rear traction motor with transaxle assembly.

(c) Check MGR for an interphase short using a milliohmmeter.

(1) Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

HINT
If the MGR temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

Standard Resistance:

HINT
- To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 68°F (20°C).
* R20 = Rt / {1 + 0.00393 X (T - 20)}
- The calculation is based on the following:
* R20: Resistance at 68°F (20°C) (mOhms)
* Rt: Measured resistance (mOhms)
* T: Temperature when the resistance is measured (°C)
(d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

NOTICE:
Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

Standard Resistance:

(e) Install the No. 3 wire frame and extension wire assembly to the rear traction motor with transaxle assembly.

NG -- REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY
OK -- Continue to next step.

7. REPLACE EXTENSION WIRE ASSEMBLY

(a) Replace the extension wire assembly Components.

NEXT -- REPLACE INVERTER WITH CONVERTER ASSEMBLY

8. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

(a) Replace the rear traction motor with transaxle assembly Components.

NEXT -- Continue to next step.

9. REPLACE EXTENSION WIRE ASSEMBLY

(a) Replace the extension wire assembly Components.

NEXT -- REPLACE INVERTER WITH CONVERTER ASSEMBLY

10. CHECK EXTENSION WIRE ASSEMBLY P0A78

NG -- CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR)
OK -- Continue to next step.

11. CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (MGR)

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

(b) Remove the No. 3 wire frame and extension wire assembly from the rear traction motor with transaxle assembly.

(c) Check MGR for an interphase short using a milliohmmeter.

(1) Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

(e) Install the No. 3 wire frame and extension wire assembly to the rear traction motor with transaxle assembly.

NG -- REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY
OK -- Continue to next step.

14. REPLACE EXTENSION WIRE ASSEMBLY

(a) Replace the extension wire assembly Components.

NEXT -- REPLACE NO.3 WIRE FRAME

15. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

(a) Replace the rear traction motor with transaxle assembly Components.

NEXT -- Continue to next step.

16. REPLACE EXTENSION WIRE ASSEMBLY

(a) Replace the extension wire assembly Components.

NEXT -- REPLACE NO.3 WIRE FRAME

17. REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY

(a) Replace the rear traction motor with transaxle assembly Components.

NEXT -- Continue to next step.

18. REPLACE NO.3 WIRE FRAME

(a) Replace the No. 3 wire frame Components.

NEXT -- Continue to next step.

19. REPLACE INVERTER WITH CONVERTER ASSEMBLY

(a) Replace the inverter with converter assembly Components.

NEXT -- Continue to next step.

20. CHECK DTC OUTPUT

(a) Check the other DTCs that were output together with DTC P0A79-716.

Result:

NOTICE:
DTC P0A79-716 is stored after any of DTCs P0A79-136, 692, 693, 694, 695, 696, 712, 812, 813 and 814 are stored. After troubleshooting and repairing DTC P0A79-716, be sure to troubleshoot all the other DTCs.

NEXT -- GO TO DTC CHART Hybrid Control System