Hyundai Sonata 1991 Shop Manual page 236

Check fuel pressure
[Refer to page 31-34)
GENERAL
~------3>
Wrong
o Fuel pump [Refer to page 31-33)
o Fuel filter
o Fuel pressure regulator
OK
1/
Check injectors
- - - - 4
Injection condition
Wrong
'--'--------------~
Check MPI electronic circuit
------3>
Wrong
o Wiring connections
o Power to ECU
1. Fusible links
2. Fuses
3. MPI control relay
o Engine coolant temperature
sensor
o Intake air temperature sensor
o Injection signal circuit
1. Injector wiring
2. ECU
31-11