P3087

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P3087-183: Open Circuit in DC / DC Converter EMPS
P3087-183 - Open Circuit in DC / DC Converter EMPS

DESCRIPTION

The hybrid vehicle control ECU 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 CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

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

OK:

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

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

2. CHECK CONNECTOR CONNECTION CONDITION (POWER STEERING CONVERTER CONNECTOR)

(a) Check the connection of the low voltage connector of the power steering converter.





OK:

The connector is connected securely and there are no contact problems.

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

3. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - HYBRID VEHICLE CONTROL ECU)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.





(b) Remove the service plug grip Hybrid Control System.

(c) Disconnect low voltage connector n1 from the power steering converter.

HINT
For the removal and installation procedures related to the low voltage connector of the power steering converter, Removal.

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

Standard resistance (Check for open):





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

OK -- REPLACE POWER STEERING CONVERTER Removal

4. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect connector A75 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 Components