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

L110 HYBRID VEHICLE 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 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, 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:

DTC P0AE6-225 is also output.

YES -- GO TO INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC
NO -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (HV CONTROL ECU CONNECTOR)

(a) Turn the power switch off.

(b) Check the connections of the hybrid vehicle control ECU connectors.

Result:

The connectors are connected securely and there are no contact problems.

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.

Result:

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 HV CONTROL ECU)

(a) Turn the power switch off.

(b) Disconnect the battery pack wire connector Components.

Standard resistance:

NG -- CHECK HARNESS AND CONNECTOR (HV 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) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle Control System.

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

(b) Check the connection of the low voltage connector of the hybrid vehicle converter.

Result:

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 connector N1 from the hybrid vehicle converter.

(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 Components

8. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - BATTERY PACK WIRE CONNECTOR)

(a) Disconnect connector A54 from the hybrid vehicle control ECU.

(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 Service and Repair

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 the DTCs.

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.

YES -- REPLACE HYBRID VEHICLE CONTROL ECU Service and Repair
NO -- Continue to next step.

11. CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems L110 Hybrid Vehicle Control System.

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

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Service and Repair