Page 24 - Foton Workshop Manual - Tunland (AT)

01-18 INTRODUCTION - HOW TO TROUBLESHOOT

01 1 . Before using the analyzer, carefully review the user's manual.
2 . Connect the analyzer to the dashboard diagnostics harness connector and
switch on the ignition. If there is no communication between the analyzer and
the control module, it means either the vehicle or the analyzer is defective.
(a) If the analyzer works properly when connected another vehicle, check the dashboard
diagnostics harness or the control module power supply.
(b) If no communication when the analyzer is connected to another vehicle, it means the
analyzer might be defective. Follow the self-diagnostics procedure in the user's manual.

How to Troubleshoot

NOTICE

• In this part, we focus on the fundamental processes.
• Please troubleshoot subject to the detailed processes listed below.
• This manual explains the most effective troubleshooting process for each circuit.
(Refer to "Chapter 04. Diagnostics".)
• Before any service, review the troubleshooting process of the related circuits.

1 . Defective Vehicle Delivered
2 . The customer describes the defect.
(a) Inquire the customer about the situation and circumstance when the defect occurred.
3 . Identify symptom and check DTC (with data flow).
(a) Measure the battery voltage.
Voltage: 11~14V (engine off)

(b) Visually check for broken or short circuit in the harness, connector and fuse.
(c) Start the engine and warm it up to normal working temperature.
(d) Identify the symptom and conditions and check DTC.
If any DTC?
Yes > Go to Step 4.

No > Go to Step 5.
4 . Check DTC list.
(a) Check DTC obtained in Step 3, review DTC list and define the system or part inspection
process by defective position.
Go to Step 6.

5 . Review defects.
(a) Check the exact symptom obtained in Step 3, review the defect list and define the
system or part inspection process by potential positions.
6 . Check the Circuit & Part
(a) Check the system circuit or part identified in Steps 4 & 5, as the potential cause of the
defect.
(b) Confirm the defective circuit or part.
7 . Repair

(a) Adjust, repair or replace the defective circuit or part.
8 . Verification

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