Up to 08/2009
HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A10-592: DC / DC Converter Status Circuit High Input
P0A10-592 - DC / DC Converter Status Circuit High 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 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 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 HARNESS AND CONNECTOR (INVERTER WITH CONVERTER - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.
2. CLEAR DTC P0A09
NEXT -- Continue to next step.
3. 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 -- REPLACE POWER MANAGEMENT CONTROL ECU Components
A -- Continue to next step.
4. 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
5. 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 manual because this may cause a malfunction.
(b) Disconnect the A79 connector from the inverter with converter assembly.
(c) Disconnect the A80 connector from the power management control ECU.
(d) Turn the power switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NOTICE:
Turning the power switch on (IG) with the inverter with converter assembly connector and the power management control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(f) Turn the power switch off.
(g) Connect the inverter with converter assembly connector.
(h) Connect the power management control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. REPLACE POWER MANAGEMENT CONTROL ECU
(a) Replace the power management control ECU Components.
NEXT -- Continue to next step.
7. CLEAR DTC P0A09
NEXT -- Continue to next step.
8. 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 -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
A -- COMPLETED