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

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

DESCRIPTION

The hybrid vehicle converter (DC/DC converter) controls output voltage (12 V) based on duty ratio signals sent from the power management control ECU (HV CPU).





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 removing 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 Hybrid Control System: Precaution.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR) P0340

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

2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343

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

3. CHECK POWER MANAGEMENT CONTROL ECU (CHECK WAVEFORM)

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

(b) Connect an oscilloscope between the power management control ECU terminals specified in the table below, and measure the waveform.









Text in Illustration





OK:

The waveform appears as shown in the illustration.

HINT
- Perform this inspection with the power management control ECU connector connected.

(c) Turn the power switch off.

NG -- CHECK POWER MANAGEMENT CONTROL ECU
OK -- Continue to next step.

4. CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Clear DTCs and freeze frame data.

NEXT -- Continue to next step.

5. CHECK DTC OUTPUT (HYBRID CONTROL)

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

(b) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(c) Check if DTCs are output.

Result:





(d) Turn the power switch off.

B -- REPLACE POWER MANAGEMENT CONTROL ECU Components
A -- Continue to next step.

6. CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems Check for Intermittent Problems.

NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components

7. CHECK POWER MANAGEMENT CONTROL ECU

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

(b) Disconnect connector A62 from the inverter with converter assembly.

(c) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





(d) Connect the inverter with converter assembly connector.

NG -- CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER - POWER MANAGEMENT CONTROL ECU)

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

8. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER - POWER MANAGEMENT CONTROL ECU)

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

(b) Disconnect connector A62 from the inverter with converter assembly.

(c) Disconnect connector A19 from the power management control ECU.

(d) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





(e) Connect the inverter with converter assembly connector.

(f) Connect the power management control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components