3000GT V6-3.0L SOHC (1998)
module.
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The injector has a fixed nozzle opening area and the fuel pressure against manifold inside pressure is regulated to a fixed level. Therefore, the
volume of fuel injected by the injector is determined by the time during which the needle valve is open, namely, by the time during which the
solenoid coil is energized.
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The battery voltage is applied through the MFI relay to this injector. When the engine control module turns on the power transistor in the module,
the solenoid coil is energized to open the injector valve, which then injects fuel.
TROUBLESHOOTING HINTS
Hint 1: If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.
Hint 2: If the injector does not operate when the engine that is hard to start is cranked, the following as well as the injector itself may be
responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
(2) Faulty MFI relay
(3) Faulty crankshaft position sensor, camshaft position sensor
Hint 3: If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut one after another during idling, make
following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check
Hint 4: If the injector harness and individual part checked good but the injector drive time is out of specification, the following troubles are
suspected.
(1) Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance
