DTC P0A94-172: 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
   P0A94-172 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
   P0AA6-526	Hybrid Battery Voltage System Isolation Fault
   P0C76-523	Hybrid Battery System Discharge Time Too Long

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
   • P0A94-172 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.
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: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Refer to PROCEDURE - Step 4

Result: 

NG 

See step  17

Result: 

OK 

See step  5

Refer to PROCEDURE - Step 5

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Refer to PROCEDURE - Step 6

Result: 

NG 

See step  19

Result: 

OK 

See step  7

Refer to PROCEDURE - Step 9

Result: 

B 

REPLACE MALFUNCTIONING PARTS 

Result: 

C 

CONNECT SECURELY 

Result: 

A 

See step  8

Refer to PROCEDURE - Step 10

Result: 

B 

REPLACE MALFUNCTIONING PARTS 

Result: 

C 

CONNECT SECURELY 

Result: 

A 

See step  9

Refer to PROCEDURE - Step 11

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

OK 

See step  10

Refer to PROCEDURE - Step 12

Result: 

NG 

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

OK 

See step  11

Refer to PROCEDURE - Step 13

Result: 

NG 

See step  21

Result: 

OK 

See step  12

Refer to PROCEDURE - Step 14

Result: 

NG 

REPAIR OR REPLACE POWER SOURCE CIRCUIT 

Result: 

OK 

See step  13

Refer to PROCEDURE - Step 15

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  14

Refer to PROCEDURE - Step 16

Result: 

NG 

REPLACE POWER MANAGEMENT CONTROL ECU 

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

Result: 

OK 

See step  15

Refer to PROCEDURE - Step 7

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  16

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 9

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  18

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  20

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  23

Result: 

OK 

See step  22

(Refer to COMPONENTS [10/2014 - ] )

NEXT 

REPLACE FUSE (INV) 

NEXT 

REPLACE FUSE (INV)