III. SQR480EC EI system faults and trouble shooting
4.1 CAN NOT START ENGINE
Power check
1 battery
2 fuse
Check ignition system
problem
1 ECU voltage
check
2 Check ignition
switch
3 check starter relay
4 check starter
5check connecting
harness
Repair or replace defective
components
Check ignition
system falut
Check
1 ignition wire
2 ignition coil
3 spark
check fuel pipe
pressure and fuel
injector
★ ECU power wire diagnostic
Measure ECU voltage with a digital voltmeter, Pin A16 is positive and pin B16 is negative.
When ignition is turned on, this pin voltage is 12V. If the voltage is not 12V, check ECU
fuse and related circuit.
★ Power and ground fault diagnostic
Computer ground lead is generally connected to battery negative lead.
1 fuel pressure
regulator
2 fuel pump
3 fuel filter
4 fuel injector
5 fuel pipe
leakage
To Next Page
