4WD Control System Check
4WD Control System Check
Refer to the following items for the details of each step.
1.
Customer complaint analysis
Perform customer complaint analysis.
Was customer complaint analysis performed?
YES
Go to Step 2.
NO
Perform customer complaint analysis.
2.
DTC check, record and clearance
Check for DTC.
Is there any DTC(s)?
YES
Print DTC or write them down and clear them by referring to DTC Clearance. Go to Step 3.
NO
Go to Step 4.
3.
Visual inspection
Perform visual inspection.
Is there any faulty condition?
YES
Repair or replace malfunction part. Go to Step 11.
NO
Go to Step 5.
4.
Visual inspection
Perform visual inspection.
Is there any faulty condition?
YES
Repair or replace malfunction part. Go to Step 11.
NO
Go to Step 8.
5.
Trouble symptom confirmation
Select 2WD/4WD switch to "2WD", "4WD-auto" and "4WD-lock" positions referring to 4WD Control System Operation Inspection 4WD Control System Operation Inspection.
Confirm trouble symptom.
Is trouble symptom identified?
YES
Go to Step 6.
NO
Go to Step 7.
6.
Rechecking and record of DTC
Recheck for DTC referring to DTC Check DTC Check.
Is there any DTC(s)?
YES
Go to Step 9.
NO
Go to Step 8.
7.
Rechecking and record of DTC
Recheck for DTC referring to DTC Check DTC Check.
Is there any DTC(s)?
YES
Go to Step 9.
NO
Go to Step 10.
8.
4WD control symptom diagnosis
Check and repair according to 4WD Control Symptom Diagnosis 4WD Control Symptom Diagnosis.
Are check and repair complete?
YES
Go to Step 11.
NO
Check and repair malfunction part(s). Go to Step 11.
9.
Troubleshooting for DTC
Check and repair according to applicable DTC flow.
Are check and repair complete?
YES
Go to Step 11.
NO
Check and repair malfunction part(s). Go to Step 11.
10.
Check for intermittent problems
Check for intermittent problems referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection.
Is there any faulty condition?
YES
Repair or replace malfunction part(s). Go to Step 11.
NO
Go to Step 11.
11.
Final confirmation test
Clear DTC if any.
Perform final confirmation test.
Is there any problem symptom, DTC or abnormal condition?
YES
Go to Step 6.
NO
END.
Detail of 4WD Control System Check
Step 1. Customer complaint analysis
Record details of the problem (failure, complaint) and how it occurred as described by the customer.
For this purpose, use of such a questionnaire form as shown in the following will facilitate collecting information to the point required for proper analysis and diagnosis.
Customer questionnaire (Example)
NOTE:
The form is a standard sample. It should be modified according to conditions characteristic of each market.
Step 2. DTC check, record and clearance
First, referring to DTC Check DTC Check
, check DTC and pending DTC. If DTC exists, print or write down DTC and then clear malfunction DTC(s) by referring to DTC Clearance DTC Clearance. Malfunction DTC indicates malfunction in the system but it is not possible to know from it whether the malfunction is occurring now or it occurred in the past and normal condition has been restored. In order to know that, check symptom in question according to Step 5 and then recheck DTC according to Step 6.
Diagnosing a trouble based on the DTC in this step only or failure to clear the DTC in this step may result in an faulty diagnosis, trouble diagnosis of a normal circuit or difficulty in troubleshooting which is otherwise unnecessary.
Step 3 and 4. Visual inspection
As a preliminary step, be sure to perform visual check of the items that support proper function of the 4WD control system referring to Visual Inspection Visual Inspection.
Step 5. Trouble symptom confirmation
Check trouble symptoms based on information obtained in Step 1. Customer complaint analysis
and Step 2. DTC check, record and clearance.
Also, reconfirm DTC according to "DTC Confirmation Procedure" described in each DTC flow.
Step 6 and 7. Rechecking and record of DTC
Refer to DTC Check DTC Check
for checking procedure.
Step 8. 4WD control symptom diagnosis
Check the parts of the system suspected as a possible cause referring to 4WD Control Symptom Diagnosis 4WD Control Symptom Diagnosis.
Step 9. Troubleshooting for DTC
Based on the DTC indicated in Step 6 / 7 and referring to "applicable DTC flow", locate the cause of the trouble, namely in a sensor, switch, wire harness, connector, coupling assembly, 4WD control module or other part and repair or replace faulty parts.
Step 10. Check for intermittent problem
Check parts where an intermittent trouble is easy to occur (e.g. wire harness, connector, etc.), referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection
and related circuit of DTC recorded in Step 2.
Step 11. Final confirmation test
Confirm that the problem symptom has gone and the vehicle is free from any abnormal conditions. If what has been repaired is related to the malfunction DTC, clear the DTC once and check to ensure that no malfunction DTC is indicated.