DTC P0A94-553: DC / DC Converter Performance [10/2014 - 10/2015]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check for DTCs.

   Result

   Result	Proceed to
   P0A94-553 only is output, or DTCs except the ones in the table below are also 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, 503, 504, 505, 506, 586, 806, 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
   P0A94-442, 547, 548, 549, 554, 555, 556, 585, 587, 589, 590	DC / DC Converter Performance
   P0C73-776	Motor Electronics Coolant Pump "A" Control Performance
   P0C76-523	Hybrid Battery System Discharge Time Too Long
   P314A-828	Inverter Coolant Pump Speed Signal

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
   • P0A94-553 may be stored due to a malfunction which also causes DTCs in the preceding table to be stored. 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. After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly.
5. Turn the power switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - 10/2015] )

Result: 

A 

See step  2

Refer to PROCEDURE - Step 4

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  3

Refer to PROCEDURE - Step 3

Result: 

B 

ADD HV COOLANT 

Result: 

C 

INSPECT FOR HV COOLANT LEAK AND ADD HV COOLANT 

Result: 

A 

See step  4

Refer to PROCEDURE - Step 4

Result: 

NG 

CORRECT THE PROBLEM 

Result: 

OK 

See step  5

Refer to PROCEDURE - Step 5

Result: 

NG 

CHECK COOLING FAN SYSTEM 

(Refer to Cooling Fan Circuit [10/2014 - 10/2015] )

Result: 

OK 

See step  6

Refer to PROCEDURE - Step 16

Result: 

B 

See step  21

Result: 

A 

See step  7

Refer to PROCEDURE - Step 3

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

Refer to PROCEDURE - Step 4

Result: 

NG 

See step  22

Result: 

OK 

See step  9

Refer to PROCEDURE - Step 5

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  10

Refer to PROCEDURE - Step 6

Result: 

NG 

See step  24

Result: 

OK 

See step  11

Refer to PROCEDURE - Step 9

Result: 

B 

REPLACE MALFUNCTIONING PARTS 

Result: 

C 

CONNECT SECURELY 

Result: 

A 

See step  12

Refer to PROCEDURE - Step 10

Result: 

B 

REPLACE MALFUNCTIONING PARTS 

Result: 

C 

CONNECT SECURELY 

Result: 

A 

See step  13

Refer to PROCEDURE - Step 11

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

OK 

See step  14

Refer to PROCEDURE - Step 12

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

OK 

See step  15

Refer to PROCEDURE - Step 13

Result: 

NG 

See step  26

Result: 

OK 

See step  16

Refer to PROCEDURE - Step 14

Result: 

NG 

REPAIR OR REPLACE POWER SOURCE CIRCUIT 

Result: 

OK 

See step  17

Refer to PROCEDURE - Step 15

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  18

Refer to PROCEDURE - Step 16

Result: 

NG 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to COMPONENTS [10/2014 - 10/2015] )

Result: 

OK 

See step  19

Refer to PROCEDURE - Step 7

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  20

Refer to PROCEDURE - Step 8

Result: 

OK 

REPLACE INVERTER WITH CONVERTER ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

NG 

CONNECT SECURELY 

Refer to PROCEDURE - Step 7

COMPLETED 

Refer to PROCEDURE - Step 9

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  23

Refer to PROCEDURE - Step 10

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Refer to PROCEDURE - Step 11

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  25

Refer to PROCEDURE - Step 12

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Refer to PROCEDURE - Step 23

Result: 

NG 

See step  28

Result: 

OK 

See step  27

(Refer to COMPONENTS [10/2014 - ] )

NEXT 

REPLACE FUSE (INV) 

NEXT 

REPLACE FUSE (INV)