Information Summary and Preparation
-1
(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 (2500
Ω
) 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
Check the ECU circuit
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