B2771

B2771 PTC ELEMENTS HEATER

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC B278F or B2790, first perform the trouble diagnosis for DTC B278F or
B2790. Refer to "DTC Logic" B278F.
- If DTC is displayed along with DTC B2792, first perform the trouble diagnosis for DTC B2792. Refer to HAC102, "DTC Logic".
- If DTC is displayed along with DTC B2793, first perform the trouble diagnosis for DTC B2793. Refer to HAC103, "DTC Logic".
- If DTC is displayed along with DTC B2794, first perform the trouble diagnosis for DTC B2794. Refer to HAC104, "DTC 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 hot and wait at least 2 seconds.
5.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
6.Check DTC.
Is DTC detected?
YES- Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK HEATER FLUID FOR LEAK

Check heater fluid for leak. Refer to "Inspection" Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace malfunctioning parts.

2. CHECK HEATER PUMP

With CONSULT
1.Turn power switch ON.
2.Using CONSULT, perform "HVAC TEST" on "ACTIVE TEST" of "HVAC". Refer to "CONSULT Function" CONSULT Function.
3.When the test items are being conducted, check that the heater pump operates normally for each mode.
Is the inspection result normal?
YES- Replace PTC elements heater. Refer to "Removal and Installation" Removal And Installation.
NO- Replace heater pump. Refer to "Removal and Installation" Removal And Installation.