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

(d) Check if DTCs are output.

Result:

(e) Turn the power switch off.

B -- GO TO DTC CHART (P0AE6-225) P0AE6
A -- 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 (HYBRID VEHICLE CONVERTER CONNECTOR) P0A09

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

4. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

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

(b) Using an oscilloscope, measure the waveform.

Text in Illustration

OK:

The waveform appears as shown in the illustration.

HINT
- Perform this inspection with the hybrid vehicle converter connector connected.
- The cycle will vary depending on the specified voltage of the hybrid vehicle converter (DC/DC converter).
(c) Turn the power switch off.

NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.

5. 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.

6. CHECK DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

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

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

(d) Check if DTCs are output.

Result:

(e) Turn the power switch off.

B -- REPLACE HYBRID VEHICLE CONTROL ECU Components
A -- Continue to next step.

7. CHECK FOR INTERMITTENT PROBLEMS

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

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

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

8. CHECK HARNESS AND CONNECTOR

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 manual because this may cause a malfunction.

(b) Disconnect connector A58 from the hybrid vehicle control ECU.

(c) Disconnect connector z17 from the hybrid vehicle converter.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

Text in Illustration

(e) Connect the hybrid vehicle converter connector.

(f) Connect the hybrid vehicle control ECU connector.

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

9. CHECK HYBRID VEHICLE 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 manual because this may cause a malfunction.

(b) Disconnect connector z17 from the hybrid vehicle converter.

Standard Resistance:

Text in Illustration

(d) Connect the hybrid vehicle converter connector.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU Components

OK -- REPLACE HYBRID VEHICLE CONVERTER Components