Test Step 2. Use ET to Check for Logged Diagnostic Codes

314

TM 9-2320-312-24-2

Troubleshooting Section

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

C. Monitor the "Logged Diagnostic Code" screen

Electrical shock hazard. The electronic unit injec-

of ET.

tor system uses 90-120 volts.

Expected Result:

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

One or more of the listed codes have been logged:

A strong electrical shock hazard is present if the

ignition key is not turned OFF.

1-11 Cylinder 1 Fault (72)

B. Thoroughly inspect the ECM engine harness

2-11 Cylinder 2 Fault (72)

connector J2/P2 and the solenoid connector for

the injector J300/P300. Refer to Troubleshooting,

3-11 Cylinder 3 Fault (73)

"Electrical Connectors - Inspect" for details.

4-11 Cylinder 4 Fault (73)

C. Perform a 45 N (10 lb) pull test on each of the

wires in the ECM connector and the solenoid

5-11 Cylinder 5 Fault (74)

connector for the injector J300/P300 that are

associated with injector solenoids.

6-11 Cylinder 6 Fault (74)

Refer to Illustration 134.

Results:

D. Check the ECM connector (allen head screw) for

Yes Proceed to Test Step 4.

the proper torque of 6.0 Nm (55 lb in).

No Proceed to Test Step 3.

E. Check the solenoid connector for the injector

J300/P300 in order to ensure the proper mating

Test Step 3. Check the Variation of the

of the connector.

Injectors From Cylinder to Cylinder.

F. Check the harness and wiring for abrasion and

pinch points from the injectors to the ECM.

A. Connect ET to the cab data link connector.

Expected Result:

B. When possible, put the truck on a dynamometer.

C. Start the engine.

All connectors, pins and sockets should be

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

D. Allow the engine to warm up to normal operating

temperature 77 C (171 F).

or pinch points.

Results:

E. After the engine is warmed to operating

temperature, access the "Cylinder Cutout Test"

OK Proceed to Test Step 2.

by accessing the following display screens in

order:

Not OK

"Diagnostics"

Repair: Perform the following repair:

"Diagnostic Tests"

Repair the connectors or wiring and/or replace

"Cylinder Cutout Test"

the connectors or wiring. Ensure that all of the

seals are properly in place and ensure that the

connectors are completely coupled.

F. Enable the cooling fan, if the fan is not controlled

by the ECM. If the ECM controls the cooling fan,

the cooling fan will start automatically when the

Verify that the repair eliminates the problem.

test begins.

STOP.

G. Shut off all parasitic loads such as the air

Test Step 2. Use ET to Check for Logged

conditioning and the air compressors which

Diagnostic Codes.

could affect the results of the test.

H. Cut out each cylinder and watch the "Fuel

A. Connect ET to the cab data link connector.

Position" of all of the other cylinders.