Page 698 - Workshop Manual - Tunland (2017)

04-12 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04 BASIC INSPECTION

If the failure cannot be identified through DTC check, failureshooting analysis shall be
conducted for all circuits that might cause the failure. In most cases, the faulty position may
be quickly found out by conducting the basic inspections of engine shown in the following
process chart. Therefore, it is extremely necessary to adopt such a test method to eliminate
the engine failures.
1 . Check battery voltage
WARNING

The check shall be conducted when the engine is shut down or the ignition switch is
set to its OFF position.
Results

Result Go to

11V or higher The next step

Lower than 11V Recharge or change the battery
2 . Check whether or not the engine can be started up.

Check whether the result is normal?
Yes > Go to the next step.

No > Go to the list of failure phenomena
3 . Check the air filter.
Is the result normal (whether or not containing dust, soil or oil)?

Yes > Go to the next step.
No > Replace or clean the filter.
4 . Check the idle speed.

Check whether the result is normal?
Yes > Go to the next step.
No > Go to the list of failure phenomena

5 . Check the fuel pressure.
Check whether the result is normal?
Yes > Go to the next step.

No > Exclude the failure of fuel pressure; go to the next step.