B278C

B278C, B278D 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.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
Is DTC detected?
YES- .
NO- INSPECTION END


Diagnosis Procedure


1. INSPECTION START

Confirm the detected DTC. .
Which DTC is detected?
B278C - GO TO 2.
B278D - GO TO 4.

2. CHECK ELECTRIC COMPRESSOR COMMUNICATION LINE FOR OPEN

1.Turn power switch OFF.
2.Disconnect electric compressor and A/C auto amp. connector.
3.Check continuity between electric compressor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK ELECTRIC COMPRESSOR COMMUNICATION LINE FOR SHORT

Check continuity between electric compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair harness or connector.

4. CHECK ELECTRIC COMPRESSOR COMMUNICATION LINE FOR OPEN

1.Turn power switch OFF.
2.Disconnect electric compressor and A/C auto amp. harness connector.
3.Check continuity between Electric compressor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair harness or connector.

5. CHECK ELECTRIC COMPRESSOR COMMUNICATION LINE FOR SHORT

Check continuity between electric compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK ELECTRIC COMPRESSOR POWER SUPPLY

1.Disconnect electric compressor connector.
2.Turn power switch ON.
3.Check voltage between electric compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.

7. CHECK ELECTRIC COMPRESSOR GROUND CIRCUIT

1.Turn power switch OFF.
2.Check continuity between electric compressor harness connector and ground.





Is the inspection result normal?
YES- GO TO 8.
NO- Repair harness or connector.

8. CHECK A/C AUTO AMP.

With CONSULT
1.Reconnect all harness connectors disconnected.
2.Turn power switch ON.
3.Use CONSULT to perform "Mode 1" of the "HVAC Test"of the "HVAC""Active Test". Consult Function.
4.Check that the electric compressor operates normally.
Is the inspection result normal?
YES- GO TO 9.
NO- Replace A/C control (A/C auto amp.). (Removal and Installation). Then GO
TO 9.

9. PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC confirmation procedure. .
Is DTC B278C or B278D detected?
YES- Replace electric compressor. Removal and Installation.
NO- Perform intermittent incident. Intermittent Incident.