P3086

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P3086-184: Short Circuit in DC / DC Converter EMPS
P3086-184 - Short Circuit in DC / DC Converter EMPS

DESCRIPTION

The power management control ECU (HV CPU) requests the power steering converter to operate or stop according to the usage state of the HV battery.

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 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 F101 from the power steering converter assembly.

Text in Illustration

Standard Voltage:

Text in Illustration

NOTICE:
Turning the power switch on (IG) with the connector of the power steering converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(e) Turn the power switch off.

(f) Connect the power steering converter assembly connector.

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

OK -- REPLACE POWER STEERING CONVERTER ASSEMBLY

2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - POWER STEERING CONVERTER)

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 F101 from the power steering converter assembly.

(c) Disconnect connector F98 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 connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(f) Turn the power switch off.

(g) Connect the power steering converter assembly connector.

(h) Connect the power management control ECU connector.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU Components

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR