DTC P0A7A-344: Generator Inverter Performance: Procedure

CHECK DTC OUTPUT (HV)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0A7A-344 only is output.	A
Any of the following DTCs are also output.	B

DTC No.	Relevant Diagnosis
P0A1A (all INF codes) *1	Generator Control Module
P0A1B (all INF codes) *1	Drive Motor "A" Control Module
P0A1D (all INF codes) *1	Hybrid Powertrain Control Module
P0A3F-243	Drive Motor "A" Position Sensor Circuit
P0A40-500	Drive Motor "A" Position Sensor Circuit Range / Performance
P0A41-245	Drive Motor "A" Position Sensor Circuit Low
P0A4B-253	Generator Position Sensor Circuit
P0A4C-513	Generator Position Sensor Circuit Range / Performance
P0A4D-255	Generator Position Sensor Circuit Low
P0A60 (all INF codes) *1	Drive Motor "A" Phase V Current
P0A63 (all INF codes) *1	Drive Motor "A" Phase W Current
P0A72 (all INF codes) *1	Generator Phase V Current
P0A75 (all INF codes) *1	Generator Phase W Current
P0A78-266, 267, 279, 287, 503, 504, 505, 506, 523, 586, 806, 807, 808	Drive Motor "A" Inverter Performance
P0A7A-325, 517, 518, 809, 810, 811	Generator Inverter Performance
P0A94-547, 548, 549, 554, 555, 556, 585, 587, 589, 590	DC / DC Converter Performance
P0AA6 (all INF codes) *1	Hybrid Battery Voltage System Isolation Fault
P3004-132	Power Cable Malfunction
P3233-750	Short to B+ in Blocking of HV Gate Connection
P3240-443	DC / DC Converter Control Circuit

HINT:

*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
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.

B → See step 7

A: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
WARNING:
Be sure to wear insulated gloves.
1. Turn the power switch off.
2. Remove the service plug grip. Refer to PRECAUTION .
  NOTE:
  After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.
3. Check the connection of the low voltage connector of the inverter with converter assembly.
  
  Fig 1: Identifying Inverter With Converter Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK
  
  The connector is connected securely and there are no contact problems.
  
  HINT:
  
  When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.
NG → CONNECT SECURELY

OK: Go to next step
CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to PROCEDURE - Step 8
C → CONNECT SECURELY

B → REPLACE MALFUNCTIONING PARTS

A: Go to next step
CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG1). Refer to PROCEDURE - Step 10
NG → See step 5

OK → See step 9
CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to PROCEDURE - Step 18
C → CONNECT SECURELY

B → REPLACE MALFUNCTIONING PARTS

A: Go to next step
CHECK GENERATOR CABLE. Refer to PROCEDURE - Step 19
NG → See step 10

OK → See step 8
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to REMOVAL
REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to REMOVAL
REPLACE GENERATOR CABLE. Refer to REMOVAL