Tech Tips
Use these procedures to troubleshoot the air conditioning system.
*: Use the intelligent tester.
VEHICLE BROUGHT TO WORKSHOP
NEXT |
CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK
NEXT |
INSPECT BATTERY VOLTAGE
Measure the voltage of the battery.
Standard voltage |
---|
11 to 14 V |
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
NEXT |
CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
Use the intelligent tester to check if the CAN communication system is functioning normally.
Result | Proceed to |
---|---|
CAN DTC is not output | A |
CAN DTC is output (for LHD with Entry and Start System) | B |
CAN DTC is output (for LHD without Entry and Start System) | C |
CAN DTC is output (for RHD with Entry and Start System) | D |
CAN DTC is output (for RHD without Entry and Start System) | E |
B |
Go to CAN COMMUNICATION SYSTEM Click here |
C |
Go to CAN COMMUNICATION SYSTEM Click here |
D |
Go to CAN COMMUNICATION SYSTEM Click here |
E |
Go to CAN COMMUNICATION SYSTEM Click here |
A |
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.
Result | Proceed to |
---|---|
DTC is not output | A |
DTC is output | B |
B |
Go to DIAGNOSTIC TROUBLE CODE CHART Click here |
A |
PROBLEM SYMPTOMS TABLE
Refer to Problem Symptoms Table Click here.
Result | Proceed to |
---|---|
Fault is not listed in problem symptoms table | A |
Fault is listed in problem symptoms table | B |
B |
Go to step 8 |
A |
OVERALL ANALYSIS AND TROUBLESHOOTING*
Terminals of ECU Click here
Data List / Active Test Click here
On-vehicle Inspection
Inspection
NEXT |
ADJUST, REPAIR OR REPLACE
NEXT |
CONFIRMATION TEST
NEXT |
END |