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P0A94-554 - DC / DC Converter Performance





L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A94-554: DC / DC Converter Performance
P0A94-554 - DC / DC Converter Performance

DESCRIPTION

For a description of the boost converter, P0A94.





MONITOR DESCRIPTION

If excessive amperage flows through the boost converter (inverter with converter assembly) due to an internal short, the boost converter will transmit a boost converter fail signal to the MG ECU. Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM

Refer to the wiring diagrams of DTCs P0A1A-200 P0A1A and P0A1B-168 P0A1B.

INSPECTION PROCEDURE

CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:





HINT
P0A94-554 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

YES -- GO TO DTC CHART
NO -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0A78

NG -- CONNECT SECURELY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) P0A78

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK GENERATOR RESOLVER P0A78

OK -- CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
NG -- Continue to next step.

5. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A78

NG -- CONNECT SECURELY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) P0A78

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

7. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A78

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

8. CHECK MOTOR RESOLVER P0A78

OK -- CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
NG -- Continue to next step.

9. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A78

NG -- CONNECT SECURELY
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A78

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

11. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) P0A78

C -- REPLACE MALFUNCTIONING PARTS

B -- TIGHTEN TO SPECIFIED TORQUE
A -- Continue to next step.

12. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) P0A78

C -- REPLACE MALFUNCTIONING PARTS

B -- TIGHTEN TO SPECIFIED TORQUE
A -- Continue to next step.

13. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG1) P0A78

NG -- CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)
OK -- Continue to next step.

14. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MG2) P0A78

NG -- CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)
OK -- Continue to next step.

15. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A78

NG -- CONNECT SECURELY
OK -- Continue to next step.

16. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A78

NG -- CONNECT SECURELY

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Service and Repair

17. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) P0A78

C -- REPLACE MALFUNCTIONING PARTS

B -- CONNECT SECURELY
A -- Continue to next step.

18. CHECK GENERATOR CABLE P0A78

NG -- REPLACE GENERATOR CABLE Components

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

19. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) P0A78

C -- REPLACE MALFUNCTIONING PARTS

B -- CONNECT SECURELY
A -- Continue to next step.

20. CHECK MOTOR CABLE P0A78

NG -- REPLACE MOTOR CABLE Components

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components
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