P0A09-591

P311 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A09-591: DC / DC Converter Status Circuit Low Input

DTC P0A09-591 - DC / DC Converter Status Circuit Low Input

DESCRIPTION

The hybrid vehicle converter (DC/DC converter) controls output voltage based on voltage switching signals sent from the hybrid vehicle control ECU.






WIRING DIAGRAM





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.
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:
DTC P0AE6-225 is also output.
YES -- GO TO INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC (P0AE6-225)
NO -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0343
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY PACK WIRE CONNECTOR)




(a) Check the connection of the battery pack wire connector.
OK:
The connector is connected securely and there are no contact problems.
HINT: For the removal and installation procedures related to inspection of the connection of the battery pack wire connector, Components.

NG -- CONNECT SECURELY
OK -- Continue to next step.
4. CHECK HYBRID VEHICLE CONTROL ECU




(a) Connect an oscilloscope between the battery pack wire terminals specified in the table below, and measure the waveform.





HINT: Perform this inspection with the battery pack wire connected.

OK -- CLEAR DTC
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (RESISTANCE VALUE INSIDE HYBRID VEHICLE CONTROL ECU)




(a) Disconnect the battery pack wire connector.




(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
OK -- Continue to next step.
6. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER CONNECTOR)
CAUTION: Be sure to wear insulated gloves.




(a) Check that the service plug grip is not installed.
(b) Check the connection of the hybrid vehicle converter (DC/DC converter) connector.
OK:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (BATTERY PACK WIRE CONNECTOR - HYBRID VEHICLE CONVERTER)
CAUTION: Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
(b) Disconnect the n4 hybrid vehicle converter (DC/DC converter) connector Components.
(c) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONVERTER
8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
(a) Disconnect the A61 hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
9. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Read and record the DTCs and freeze frame data.
(d) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(e) Clear DTCs and freeze frame data.
NEXT -- Continue to next step.
10. RECONFIRM 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:
DTC P0A09-591 is output.
(e) Clear the DTCs.
YES -- REPLACE HYBRID VEHICLE CONTROL ECU
NO -- Continue to next step.
11. CHECK FOR INTERMITTENT PROBLEMS
(a) Check for intermittent problems Hybrid Control System.
NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
OK -- REPLACE HYBRID VEHICLE CONTROL ECU