DTC P0A94-127: 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
P0A94-127 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
P0A78-113, 128, 266, 267, 279, 284, 286, 287, 306, 806, 503, 504, 505, 506, 523, 586, 807, 808	Drive Motor "A" Inverter Performance
P0A7A-122, 130, 322, 324, 325, 344, 517, 518, 809, 810, 811	Generator Inverter Performance
P0A90-509	Drive Motor "A" Performance
P0A92-521	Hybrid Generator Performance
P0A94-172, 442, 547, 548, 549, 553, 554, 555, 556, 557, 585, 587, 589, 590	DC / DC Converter Performance
P0ADB-227	Hybrid Battery Positive Contactor Control Circuit Low
P0ADC-226	Hybrid Battery Positive Contactor Control Circuit High
P0ADF-229	Hybrid Battery Negative Contactor Control Circuit Low
P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
P3004-803	Power Cable Malfunction

HINT:

*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
P0A94-127 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 27

A: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR). Refer to PROCEDURE - Step 3
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to PROCEDURE - Step 4
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK GENERATOR RESOLVER. Refer to PROCEDURE - Step 5
NG → See step 19

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to PROCEDURE - Step 6
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK MOTOR RESOLVER. Refer to PROCEDURE - Step 7
NG → See step 21

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 INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to PROCEDURE - Step 9
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 23

OK: Go to next step
CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG2). Refer to PROCEDURE - Step 11
NG → See step 25

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 12
NG → CONNECT SECURELY

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 13
NG → CONNECT SECURELY

OK: Go to next step
CHECK INVERTER WITH CONVERTER ASSEMBLY (HIGH VOLTAGE CONNECTOR CONNECTION CONDITION). Refer to PROCEDURE - Step 13
C → CONNECT SECURELY

B → REPLACE MALFUNCTIONING PARTS

A: Go to next step
CHECK SERVICE PLUG GRIP (CONNECTION CONDITION). Refer to PROCEDURE - Step 14
NG → REPLACE SERVICE PLUG GRIP

OK: Go to next step
CHECK SERVICE PLUG GRIP. Refer to PROCEDURE - Step 15
NG → REPLACE SERVICE PLUG GRIP

OK: Go to next step
CHECK FRAME WIRE. Refer to PROCEDURE - Step 16
NG → See step 28

OK: Go to next step
INSPECT HV BATTERY JUNCTION BLOCK (SMRB). Refer to PROCEDURE - Step 17
NG → See step 29

OK: Go to next step
INSPECT HV BATTERY JUNCTION BLOCK (SMRG). Refer to PROCEDURE - Step 18
NG → See step 29

OK → See step 30
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 14
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY (MG ECU)-GENERATOR RESOLVER). Refer to PROCEDURE - Step 15
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 31
CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to PROCEDURE - Step 16
NG → CONNECT SECURELY

OK: Go to next step
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY (MG ECU) - MOTOR RESOLVER). Refer to PROCEDURE - Step 17
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 31
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 32

OK → See step 31
CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to PROCEDURE - Step 20
C → CONNECT SECURELY

B → REPLACE MALFUNCTIONING PARTS

A: Go to next step
CHECK MOTOR CABLE. Refer to PROCEDURE - Step 21
NG → See step 33

OK → See step 31
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
REPLACE FRAME WIRE. Refer to REMOVAL
REPLACE HV BATTERY JUNCTION BLOCK. Refer to REMOVAL
REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to REMOVAL
REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to REMOVAL
REPLACE GENERATOR CABLE. Refer to REMOVAL
REPLACE MOTOR CABLE. Refer to REMOVAL