Use these procedures to troubleshoot the air conditioning system.
*: Use the intelligent tester.
VEHICLE BROUGHT TO WORKSHOP
CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK
INSPECT BATTERY VOLTAGE
Measure the voltage of the battery.
|11 to 14 V|
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
w/ PTC Heater:
Using the intelligent tester, inspect battery voltage reduction history "Battery Voltage Lo Record" in the Data List Click here.
CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
Use the intelligent tester to check if the CAN communication system is functioning normally.
|CAN DTC is not output||A|
|CAN DTC is output||B|
Go to CAN COMMUNICATION SYSTEM Click here
CHECK PANEL DIAGNOSIS
Check panel diagnosis Click here.
CHECK FOR DTC*
Check for DTCs and note any codes that are output Click here.
Clear the DTCs Click here.
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.
|DTC is not output||A|
|DTC is output||B|
Go to DIAGNOSTIC TROUBLE CODE CHART Click here
PROBLEM SYMPTOMS TABLE
Refer to the Problem Symptoms Table Click here.
|Fault is not listed in problem symptoms table||A|
|Fault is listed in problem symptoms table||B|
Go to step 9
OVERALL ANALYSIS AND TROUBLESHOOTING*
Terminals of ECU Click here
Data List / Active Test Click here
ADJUST, REPAIR OR REPLACE