subaru Workshop Repair Guides

Subaru Workshop Service and Repair Manuals

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FUEL INJECTOR CONTROL SYSTEM DIAGNOSTIC CHART

CHECK FUEL INJECTOR OPERATION

Using a stethoscope, confirm that all injectors "CLICK" while cranking the engine.

Fuel Injector Connector

CHECK VOLTAGE AT INJECTORS

1.

Disconnect connector F109 (injector sub-harness).

2.

Turn the key "ON".

3.

Using a voltmeter, check voltage between male connector terminal and ground.

Connector & terminal:

Voltage:

(F109)1-Ground

Above 9V

CHECK FUEL INJECTORS

1.

Turn the key "OFF".

2.

Using an ohmmeter, check the resistance between fuel injector terminals.

Connector & terminal:

Resistance:

(F109)1-2

10 - 18 Ohm

(F109)1-3

10 - 18 Ohm

(F109)1-4

10 - 18 Ohm

If not within specification, proceed to CHECK ENGINE HARNESS 2 below.

ECU Connector

CHECK VOLTAGE BETWEEN ECU AND FUEL INJECTORS

1.

Connect connector F109.

2.

Turn ignition key "ON".

3.

Using a voltmeter, measure voltage between ECU connector terminal and body. (Back probe ECU connector.)

Connector & terminal:

Voltage:

(F119)12-Ground

Above 8V

(F119)25-Ground

Above 8V

(F119)11-Ground

Above 8V

4.

Turn key "OFF".

Negative Circuit|Page 2058 > < Negative Circuit