Sonata GL V6-3.0L (1997)
Fuel Injector: Testing and Inspection
CIRCUIT DIAGRAM
TROUBLESHOOTING HINTS
1. If the engine is hard to start when hot, check for fuel pressure and injector leaks.
2. If the injector does not operate when the engine is cranked, check for the following:
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Faulty power supply circuit to the ECM; faulty ground circuit
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Faulty control relay
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Faulty crankshaft position (CKP) sensor, camshaft position (CM P) sensor
3. If any cylinder's idle state remains unchanged when the fuel injection of each injector is cut one after another during idling, check the following:
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Injector and harness
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Ignition plug and high tension cable
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Compression pressure
4. If the injection system is OK, but the injector drive time is out of specification, check for the following:
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Injector and harness
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Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
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Loose EGR valve seating
