P0A09-591
P313 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 (12 V) based on duty ratio 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 CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0340-886
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343-747
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)
(a) Turn the ignition switch to ON.
(b) Connect an oscilloscope between the hybrid vehicle 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 hybrid vehicle control ECU connector connected.
(c) Turn the ignition switch off.
NG -- CHECK HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.
4. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Read and record the DTCs and freeze frame data.
(e) Clear DTCs and freeze frame data.
NEXT -- Continue to next step.
5. CHECK DTC OUTPUT (HV)
(a) Turn the ignition switch to ON (READY).
(b) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(c) Check if DTCs are output.
Result:
(d) Turn the ignition switch off.
B -- REPLACE HYBRID VEHICLE CONTROL ECU Removal
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 HYBRID VEHICLE CONTROL ECU Removal
7. 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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the A64 connector 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 - HYBRID VEHICLE CONTROL ECU)
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Removal
8. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the A64 connector from the inverter with converter assembly.
(b) Disconnect the A65 connector from the hybrid vehicle control ECU.
(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.
(e) Connect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal