DTC P0A94-554: DC / DC Converter Performance; DTC P0A94-556: DC / DC Converter 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
P0A94-554 or P0A94-556 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, 287, 505, 506, 523, 586, 806, 807, 808	Drive Motor "A" Inverter Performance
P0A7A-325, 517, 518, 809, 810, 811	Generator Inverter Performance
P0A94-585, 587, 589, 590	DC / DC Converter Performance

HINT:

*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
P0A94-554 or P0A94-556 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 13

A: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR). Refer to PROCEDURE - Step 2
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to PROCEDURE - Step 3
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK GENERATOR RESOLVER. Refer to PROCEDURE - Step 4
NG → See step 9

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to PROCEDURE - Step 5
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK MOTOR RESOLVER. Refer to PROCEDURE - Step 6
NG → See step 11

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 7
NG → CONNECT SECURELY

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 9
NG → CONNECT SECURELY

OK → See step 15
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 9
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to PROCEDURE - Step 10
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 14
CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 11
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to PROCEDURE - Step 12
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 14
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