Test Step 6. Check the Injector Harness from P2 to J300 for an Open Circuit

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TM 9-2320-312-24-2

Troubleshooting Section

Test Step 7. Check the Injector Harness

Expected Result:

for a Short Circuit Between Connector

P300 and the Injector.

The status of the circuit for the suspect

injector displays "SHORT" before J300/P300 is

disconnected. The status of the circuit for the

suspect injector changes to "OPEN" after J300/P300

is disconnected.

Electrical shock hazard. The electronic unit injec-

tor system uses 90-120 volts.

Results:

Yes Reconnect J300/P300. Proceed to Test

A. Turn the ignition key switch to the OFF position.

Step 7.

A strong electrical shock hazard is present if the

ignition key is not turned OFF.

No Proceed to Test Step 8.

B. Remove the valve cover.

Test Step 6. Check the Injector Harness

from P2 to J300 for an Open Circuit.

C. Disconnect the harness from the problem injector

at the connector that is attached to the injector

solenoid. For example, if the number one injector

is the suspect injector, disconnect P301 from

J301.

Electrical shock hazard. The electronic unit injec-

tor system uses 90-120 volts.

D. Turn the ignition key switch to the ON position.

E. Access the "Injector Solenoid Test" on ET and

A. Turn the ignition key switch to the OFF position.

perform the test three times.

A strong electrical shock hazard is present if the

ignition key switch is not turned off.

Note: Ensure that the seal is installed in the harness

connector before connecting the harness to the

B. Disconnect the 12-pin connector (J300/P300).

connector. If the seal is missing, use a replacement

seal. Ensure that the seal is not stuck in the injector

C. Insert one end of a jumper wire into the socket

connector.

of the suspect injector. Insert the other end of

the jumper wire into the socket of the injector

common line for the connector (J300/P300).

Expected Result:

The status for the injector that is disconnected

D. Turn the ignition key switch to the ON position.

changes to "OPEN" when the harness is

disconnected.

E. Access the "Injector Solenoid Test" on ET and

begin the test.

Results:

Expected Result:

Yes Perform the following repair:

The status of the circuit for the suspect injector

displays "OPEN" before J300/P300 is disconnected.

Repair: Temporarily connect a new injector to

The status of the circuit for the suspect

the harness. Run the "Injector Solenoid Test". If

injector changes to "SHORT" after J300/P300 is

all cylinders indicate "OK", turn the keyswitch to

disconnected.

OFF and reconnect the old injector. If the original

injector again reads "OPEN", replace the injector.

Restore the wiring to the proper injectors. Use the

Results:

"Injector Solenoid Test" to verify that the repair

Yes Proceed to Test Step 9.

eliminates the problem.

No Proceed to Test Step 10.

Do not install the valve cover until the problem is

resolved. Clear all diagnostic codes.

STOP.

No Perform the following repair: