Service manual

Information Summary and Preparation 1
12
(1) Engine not running or slowly running during start-up
General trouble location: 1. Battery; 2. Start motor; 3. Main wiring or power switch; 4. Engine
mechanism.
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent Steps
1
Check the voltage between two battery terminals with a
multi-meter to ensure the voltage between 11 and 12V
during start-up of the engine.
Yes Next step
No Replace the battery.
2
Keep the power switch “ON” and check the voltage at the
positive terminal on the start motor over 8V.
Yes Next step
No
Fix or replace wiring
harness.
3
Remove the start motor and check its status for open
circuits or jam attributed to lubrication insufficient.
Yes
Fix or replace the start
motor.
No Next step
4
For any trouble in winter only, check lubricant in the engine
wrong for big resistance of the start motor.
Yes
Change applicable
lubricant.
No Next step
5
Check mechanical resistance inside the engine causing the
motor not running or slowly running.
Yes
Correct resistance inside
the engine.
No Repeat the said step.
(2) Engine running but start-up failing during start-up
General trouble location: 1. Oil tank empty; 2. Fuel pump; 3. RPM sensor; 4. Ignition coils; 5. Engine
mechanism.
Procedure for general diagnoses:
No. Operating Procedure
Detection
Results
Subsequent Steps
1
Connect a fuel pressure gauge before the fuel inlet of the
nozzle; press the power switch repeatedly if necessary or start
the engine to check the fuel pressure at 300kPa or so.
Yes Next step
No
Repair the fuel supply
system.
2
Connect the EMS diagnosis tester and check “Engine RPM”;
start the engine to check any RPM signal output.
Yes Next step
No
Correct circuits of the
RMP sensor.
3
Disconnect the ignition cable and connect a spark tester; start
the engine and check any high-voltage flash (blue/white).
Yes Next step
No
Repair the ignition
system.
4
Check pressure of the engine cylinder and find any possibility
of pressure insufficient.
Yes
Eliminate any
mechanical trouble of
the engine.
No Next step
5
Connect an EMS adapter and press the power switch to check
voltages at Pins 5#, 10#, and 23#; check grounding at Pins 2#
and 21#.
Yes Diagnosis assist
No
Repair the relevant
circuits.