Service manual

Information Summary and Preparation 1
14
(4) Trouble of cold start
General trouble location: 1. Water in fuel; 2. Fuel pump; 3. Engine temperature sensor; 4. Nozzle; 5.
Ignition coils; 6. Air throttle and & idle air bypass; 7. 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; start the engine to check the fuel pressure at 300kPa
or so.
Yes Next step
No Repair the fuel system.
2
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.
3
Press the engine temperature sensor connector and start the
engine; check if the engine successfully started. (Or install
a series-connected resistor (2500Ω) in lieu of the engine
temperature sensor at the engine temperature sensor
connector. Observe if the engine is successfully started.)
Yes
Correct circuits or replace
any sensor.
No Next step
4
Slightly pull the throttle to check if the engine is easily
started.
Yes
Clean the air throttle and
the idle air bypass.
No Next step
5
Disassemble the nozzle and check any leakage or jam in
the nozzle with a nozzle cleaner & analyzer.
Yes
Replace the defective
nozzle.
No Next step
6
Check fuel and observe any trouble attributed to fuel just
added.
Yes Change fuel.
No Next step
7
Check pressure of the engine cylinder and find any
possibility of pressure insufficient.
Yes
Eliminate any mechanical
trouble of the engine.
No Next step
8
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.