B278A

B278A, B278B ELECTRIC COMPRESSOR

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn power switch OFF.
2.Set the vehicle to READY.
3.Operate the automatic air conditioning system.
4.Set the temperature to full cold and wait at least 2 seconds.
5.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
Is DTC detected?
YES- .
NO- INSPECTION END


Diagnosis Procedure


WARNING:
- Because hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.
- Be sure to remove the service plug in order to shut off the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
- Be sure to put the removed service plug in your pocket and carry it with you so that another person does not accidentally connect it while work is in progress.
- Be sure to wear insulating protective equipment consisting of glove, shoes and glasses/face shield before beginning work on the high voltage system.
- Clearly identify the persons responsible for high voltage work and ensure that other persons do not touch the vehicle. When not working, cover high voltage parts with an insulating cover sheet or similar item to prevent other persons from contacting them.
- Automatic Air Conditioning.

CAUTION:
There is the possibility of a malfunction occurring if the vehicle is changed to READY status while the service plug is removed. Therefore do not change the vehicle to READY status unless instructed to do so in the Service Manual.

DIAGNOSIS PROCEDURE


CAUTION:
Erase DTC after the work is completed.

1. PRECONDITIONING


WARNING:
Shut off high voltage circuit. How to Cut Off High Voltage.
Check voltage in high voltage circuit. (Check that condenser are discharged.)
1.Disconnect high voltage connector from front side of Li-ion battery. Removal and Installation.
DANGER:


Touching high voltage components without using the appropriate protective equipment will cause electrocution.





2.Measure voltage between high voltage harness terminals.
DANGER:


Touching high voltage components without using the appropriate protective equipment will cause electrocution.
Standard: 5 V or less

CAUTION:
For voltage measurements, use a tester which can measure to 500V or higher.
- GO TO 2.

2. CHECK ELECTRIC COMPRESSOR HIGH VOLTAGE HARNESS POWER SUPPLY CIRCUIT FOR OPEN

1.Disconnect electric compressor and Li-ion battery connector.
2.Check continuity between Electric compressor high voltage harness connector and Li-ion battery high voltage harness connector.





Is the inspection result normal?
YES- GO TO 3.
NO- Replace high voltage harness between electric compressor and Li-ion battery.

3. CHECK ELECTRIC COMPRESSOR HIGH VOLTAGE HARNESS GROUND CIRCUIT

Check continuity between Electric compressor high voltage harness connector and Li-ion battery high voltage harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Replace high voltage harness between electric compressor and Li-ion battery.

4. CHECK LI-ION BATTERY

1.Connect 12V battery negative terminal.
2.Check li-ion battery. Work Flow.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace malfunctioning parts.

5. CHECK LI-ION BATTERY

Check Li-ion battery. Work Flow.
Is the inspection result normal?
YES- Replace electric compressor. Removal and Installation.
NO- Repair or replace malfunctioning parts.