No Problem causes Actions
1. Fuel injector fault
check if fuel injector operating condition
normal using scan tester.
2
Crankshaft speed and position sensor
fault
Using feeler gauge, check clearance
crankshaft speed and position sensor head
and signal wheel tooth top. Check sensor
circuit.
3 ECU socket fault
Check if good contact between socket and
ECU.
4 Idle speed control valvel fault
Using scan tester, check idle speed control
valve operating condition, and inspect if
connector contact is good.
5
Loosen throttle valve body mounting
screw
Tighten throttle valve body mounting
screw
(2) Insufficient engine power
No. Problem Causes Actions
1 Poor electric fuel pump operation
Check if all connections good. Check electric fuel
pump, replace as necessary.
2 Blocked fuel filter or pipe
Check if fuel filter and fuel pipe blocked, clean or
replace fuel pipe as necessary.
Insufficient or unstable fuel feed
pressure
Check fuel circuit and electric fuel pump.
Check if fuel injection pressure is within
specification.
Insufficient air intake Check air intake pipe
3
Damaged fuel injector
Check fuel injector performance data and
injection hole, replace as necessary
Damaged air intake pressure
sensor
Check air intake pressure sensor performance
data, replace as necessary.
Damaged crankshaft speed and
position sensor
Check crankshaft speed and position sensor
performance data, replace as necessary/
Damaged throttle position sensor
Check throttle position sensor performance data,
replace as necessary.
3
Optimum ignition time not
reached
Replace ECU
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