HOW TO PROCEED WITH TROUBLESHOOTING

HINT:

• Use these procedures to troubleshoot the air conditioning system.
• *: Use the Techstream.

1.	VEHICLE BROUGHT TO WORKSHOP

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2.	INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

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3.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

B

GO TO CAN COMMUNICATION SYSTEM

A

4.	CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the LIN communication system is functioning normally.

Result

Result	Proceed to
LIN DTC is not output	A
LIN DTC is output	B

B

GO TO LIN COMMUNICATION SYSTEM

A

5.	CHECK FOR DTC*

(a) Check for DTCs .

(b) Clear the DTCs .

(c) Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the conditions indicated by the DTC. Then recheck for DTCs.

Result

B

GO TO DTC CHART

A

(a) Refer to the Problem Symptoms Table .

Result

B

GO TO STEP 8

A

(a) Terminals of ECU

(b) Data List / Active Test

(c) Actuator Check

(d) On-vehicle Inspection

(e) Inspection

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