B2775
B2770, B2773, B2774, B2775, B2776 PTC ELEMENTS HEATER
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 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
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 disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
- To prevent the removed service plug from being connected by mistake during the procedure, always carry it in your pocket or put it in the tool box.
- Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses 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.
- Refer to "High Voltage Precautions" High Voltage Precautions.
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:
Disconnect the high voltage. Refer to "How to Disconnect High Voltage" Service and Repair.
Check voltage in high voltage circuit. (Check that condenser are discharged.)
1.Lift up the vehicle and remove the Li-ion battery under covers. Refer to "Exploded View" Service and Repair.
2.Disconnect high voltage connector from front side of Li-ion battery. Refer to "Removal and Installation" Service and Repair.
3.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 PTC ELEMENTS HEATER HIGH VOLTAGE HARNESS POWER SUPPLY CIRCUIT FOR OPEN
1.Disconnect PTC elements heater and DC/DC-J/B connector.
2.Check continuity between PTC elements heater high voltage harness connector and DC/DC-J/B high voltage harness connector.
Is the inspection result normal?
YES- GO TO 3.
NO- Replace high voltage harness between PTC elements heater and DC/DC-J/B.
3. CHECK PTC ELEMENTS HEATER HIGH VOLTAGE HARNESS GROUND CIRCUIT
Check continuity between PTC elements heater high voltage harness connector and DC/DC-J/B high voltage harness connector.
Is the inspection result normal?
YES- GO TO 4.
NO- Replace high voltage harness between PTC elements heater and DC/DC-J/B.
4. CHECK PTC ELEMENTS HEATER POWER SUPPLY
1.Disconnect PTC elements heater connector.
2.Connect 12V battery negative terminal.
3.Turn power switch ON.
4.Check voltage between PTC elements heater harness connector and ground.
Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 6.
5. CHECK PTC ELEMENTS HEATER GROUND CIRCUIT
1.Turn power switch OFF.
2.Check continuity between PTC elements heater harness connector and ground.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.
6. CHECK A/C RELAY CIRCUIT
Check A/C relay circuit. Refer to "Diagnosis Procedure" A/C Relay.
Is the inspection result normal?
YES- Repair harness or connector between A/C relay and PTC elements heater.
NO- Repair or replace error-detected parts.
7. CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace PTC elements heater. Refer to "Removal and Installation" Removal And Installation.
NO- Repair or replace malfunctioning parts.