10472323

INJECTORS

The injectors inject fuel according to a signals from the ECM. The volumeof fuel injected by the injector is determined by the time during which thesolenoid valve is energized.

CIRCUIT DIAGRAM

TROUBLESHOOTING HINTS

If the engine is difficult to start when it is hot, check low for fuel pressure and injector leaks.

If the injector does not operate when the engine is cranked, then check the following :

●

Faulty power supply circuit to the ECM or faulty ground circuit.

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Faulty MFI control relay.

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Faulty crankshaft position sensor or camshaft position sensor.

If engine idle remains unchanged when fuel injection to the cylinders is cut one after another, check for the following items about such cylinder :

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Injector and harness.

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Spark plug and high tension cable.

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Compression pressure.

If the injection system is OK but the injector drive time is out of specification, check for the following items :

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Poor combustion in the cylinder (faulty spark plug, ignition coil, compression pressure, etc.)

The MIL is on or the DTC is displayed on the HI-SCAN under the following condition.

●

When the injector itself is faulty.

USING HI-SCAN

Check item	Data display	Check conditions	Engine state	Test specification
Injectors	Injector duration	● Engine coolant temperature : 80 to 95°C (176 to 205°F) ● Lamps, electric cooling fan, accessory units : ALL OFF ● Transaxle : Neutral (P range for vehicle with A/T) ● Steering wheel : Neutral	Idle rpm	1.5 ~ 4.5 ms
			2000 rpm
			3000 rpm
			Racing	Increasing

Check item	Check condition	HI-SCAN display	Type
Injector ● Actuator test	Start the engine	01. No.1 Injector	Activate
		02. No.2 Injector	Activate
		03. No.3 Injector	Activate
		04. No.4 Injector	Activate

HARNESS INSPECTION PROCEDURES

INJECTOR INSPECTION

OPERATION CHECK

Using a HI-SCAN :

●

Activate the fuel injectors in sequence.

●

Check the operating time of the injectors.

Using a stethoscope, check the injectors for a clicking sound at idle. Check that the sound is produced at shorter intervals as the engine speed increases.

note

Ensure that the sound from an adjacent injector is not being transmitted along the delivery pipe to an inoperative injector.

If a stethoscope is not available, check the injector operation with your finger.

If no vibrations are felt, check the wiring connector, injector, or injection signal from ECM.

RESISTANCE MEASUREMENT BETWEEN TERMINALS

Disconnect the connector of the injector and measure the resistance betweenthe two terminals.

15.9 ± 0.35Ω [at 20°C (68°F)]

Re-connect the connector to the injector.