Page 246 - Foton Workshop Manual - Tunland (AT)

04-100 DIAGNOSTICS - ENGINE CONTROL SYSTEM

HOW TO CONDUCT FAILURE ANALYSIS

NOTICE
Use a diagnostic apparatus to diagnose a vehicle

1 . Send a vehicle to a maintenance depot.

04 Yes > Go to the next step.
2 . Collect and analyze the failure phenomena described by the customer.
Yes > Go to the next step.
3 . Connect the diagnostic apparatus to DLC.
Yes > Go to the next step.

4 . Check the DTC and still data.
Yes > Go to the next step.

5 . Clear the DTC and still data.
Yes > Go to the next step.
6 . Conduct visual check.
Yes > Go to the next step.

7 . Verify the failure phenomena.
Results (if the engine fails to start up, conduct the following “check for DTC” and
basic inspection)

Result Go to

The failure does not occur The next step

The failure occurs Step 9

8 . Simulation Symptom Test

Result Go to
The failure does not occur Step 11

The failure occurs The next step

9 . Check for DTC.
Results

Result Go to

Failure code occurs The next step
No failure codes occur Step 11

10 . Refer to the DTC list.

Yes > Go to Step 13.
11 . Conduct basic inspection.
Results

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