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P0A94-557 - DC / DC Converter Performance





L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A94-557: DC / DC Converter Performance
P0A94-557 - DC / DC Converter Performance

DESCRIPTION

For a description of the boost converter, P0A94.

If the boost converter detects a circuit malfunction, overheat, or an internal short, it transmits this information to the MG ECU via the boost converter fail signal line.





MONITOR DESCRIPTION

If the boost converter detects a circuit malfunction, it will transmit a boost converter fail signal to the MG ECU. The MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this information, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





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 for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
NOTICE:
After troubleshooting and performing repairs for all output DTCs, be sure to replace the inverter with converter assembly.

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
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
- P0A94-557 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. After troubleshooting and performing repairs for all output DTCs, be sure to replace the inverter with converter assembly.

B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.

2. CHECK AMOUNT OF GASOLINE

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

(b) Check the amount of fuel by referring to the fuel gauge in the meter.

OK:

Adequate amount of fuel is in the tank.

HINT
- If the vehicle is driven when there is no fuel in the tank, MG1 will crank the engine but the engine will not start. For this reason, an inoperative condition of MG1 may be detected.
- Add fuel until the low fuel level warning light turns off.

NG -- REFUEL VEHICLE
OK -- Continue to next step.

3. CHECK ENGINE START

(a) Turn the power switch on (READY).

(b) Check if the engine starts.

HINT
Depressing the accelerator pedal with the shift lever in the P position will cause the engine to start.

Result:





B -- CHECK QUANTITY OF HV COOLANT
A -- Continue to next step.

4. CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

(a) Turn the power switch off.

(b) Move the shift lever to the P position and lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:
Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection to prevent the engine from starting.

Result:





B -- CHECK QUANTITY OF HV COOLANT
A -- Continue to next step.

5. CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

(a) Lower the vehicle.

(b) Move the shift lever to the N position and lift up the vehicle.

(c) Turn the crankshaft pulley using hand tools to check if the crankshaft can rotate smoothly.

CAUTION:
Do not turn the power switch on (READY) while performing this inspection. Be sure to turn the power switch off before performing this inspection to prevent the engine from starting.

OK:

The crankshaft rotates smoothly.

NG -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

OK -- REPAIR OR REPLACE ENGINE ASSEMBLY

6. CHECK QUANTITY OF HV COOLANT P0A01

C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT

B -- ADD HV COOLANT
A -- Continue to next step.

7. CHECK COOLANT HOSE P0A01

NG -- CORRECT THE PROBLEM
OK -- Continue to next step.

8. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01

NG -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
OK -- Continue to next step.

9. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN) P0A01

NG -- CHECK COOLING FAN SYSTEM Cooling Fan Circuit
OK -- Continue to next step.

10. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0A01

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

11. INSPECT COOLING SYSTEM (FOR CLOGGING) P0A01

NG -- REPLACE MALFUNCTIONING PARTS

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation

12. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01

NG -- CHECK FUSE (INV W/P)

OK -- ADD HV COOLANT

13. CHECK FUSE (INV W/P) P0A01

NG -- CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR)
OK -- Continue to next step.

14. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR) P0A01

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

15. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0A01

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

16. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY) P0A01

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

17. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY P0A01

NG -- REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

18. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR) P0A01

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

19. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0A01

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

20. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY) P0A01

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

21. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY P0A01

NG -- REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components
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