P0A7A-344

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A7A-344: Generator Inverter Performance

DTC P0A7A-344 - Generator Inverter Performance

DESCRIPTION

See the description of the inverter (P0A78-266).
The HV control ECU controls MG1 torque in accordance with the driving condition.





MONITOR DESCRIPTION

If the difference between the requested MG1 torque and the actual MG1 torque exceeds a predetermined value, the HV control ECU determines that there is a malfunction in the execution or monitoring of the MG1 torque. Then, the HV control ECU illuminates the MIL and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are servicing the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT: At least 5 minutes are required to discharge the high-voltage condenser inside the inverter.

PROCEDURE

1. READ OUTPUT DTC (HV ECU)
(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:
DTC P0A7A (INF 344) and other DTCs are output

HINT: If any other codes besides P0A7A (INF 344) are output, perform troubleshooting for those DTCs first.

YES -- GO TO RELEVANT DTC CHART
NO -- Continue to next step.
2. INSPECT HYBRID VEHICLE GENERATOR ASSEMBLY

CAUTION: Wear insulated gloves before performing the following operation.

(a) Turn the power switch OFF.
(b) Remove the service plug grip (Removal).

NOTE: Turning the power switch ON (READY) with the service plug grip removed could cause malfunction. Therefore, never turn the power switch ON (READY) in this state.

(c) Remove the inverter cover (Removal).





(d) Disconnect the three-phase alternating current cable for the hybrid vehicle generator from the inverter.
(e) Using a milliohm meter, measure the resistance between the three-phase alternating current cable terminals of the hybrid vehicle generator.

NOTE: If the generator temperature is too high, the resistance varies considerably, which hinders determining malfunction. Therefore, measure the resistance at a minimum 8 hours after the vehicle has been stopped.

Standard resistance:





- *: Apply the formula given below to correct the resistance.

- R20 = Rt / {1 + 0.00393 x (T - 20)}

- R20: Resistance converted to 68°F (20°C) (mOhms)

- Rt: Resistance between measured lines (mOhms)

- T: Ambient air temperature during measurement (°C)

(f) Calculate the difference between the maximum and minimum resistance between terminals U - V, V - W, and W - U.
Standard resistance:
Below 2 mOhms
(g) Using a megohmmeter, measure the insulation resistance between the three-phase alternating current cable terminals of the hybrid vehicle generator and the body ground.
Standard resistance:





(h) Reconnect the three-phase alternating current cable for the hybrid vehicle generator.
(i) Reinstall the inverter cover (Installation).
(j) Reinstall the service plug grip (Installation).
NG -- REPLACE HYBRID VEHICLE GENERATOR ASSEMBLY
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY