HC. Checking the Fuel MFI LH 2.4/3.1

HC. CHECKING THE MFI LH 2.4 & LH 3.1

HC1

Connecting The Test Box




Connect the test box and check connections to GND.

-Continue with Checking the power supply HC2.

HC2

Checking The Power Supply

-Connect the control module to the test box.

-Put back the fuse you took out.




-Ignition on.

Connect the voltmeter between #35 and #5 (GND). The voltmeter should read battery voltage. Check that there is a voltage reading when the starter motor is operating as well.

If the reading Is incorrect

-Check the wiring between #35 and the ignition switch for breaks.

If this value is OK

-Check the engine speed signal from DI HC3.

HC3

Checking The Engine Speed Signal From DI EZ 116 K

Connect a voltmeter between #1 and #5 (GND).




-Operate the starter motor.

The voltmeter should read 6-9 volts.

If this value is OK

-Check the injector circuit HC4.

If the reading is incorrect

-Check the wiring between MFI LH 2.4/LH 3.1 #1 and DI #1 7 for breaks.

HC4

Checking The Injector Circuit




-Ignition on.

Connect a voltmeter between #18 and #17 (power GND). The voltmeter should read battery voltage.

If the reading Is Incorrect:

-Check the wiring to the injectors for breaks or grounding.

Connect a voltmeter between #18 and #35 (battery voltage).




-Operate the starter motor.

The voltmeter should read 300-500 mV.

If the reading Is incorrect:

-Try using a new control module.