Illustration 97 Engine harness connector

264

TM 9-2320-312-24-2

Troubleshooting Section

Results:

OK Verify that the repair eliminates the problem.

Clear the logged diagnostic codes. STOP.

Not OK

Repair: Repair the engine harness connector.

STOP.

Test Step 7. Check the Operation of the

ECM by Creating Open and Short Circuits

at the ECM Connector.

g00767376

Illustration 97

Engine harness connector

A short circuit diagnostic code should be active

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

when the jumper wire is installed.

B. Disconnect the Connector for the ECM harness.

Note: If access to the ECM connector is limited, it

Thoroughly inspect both halves of the connector

may be helpful to connect a breakout T to the ECM

for signs of corrosion or moisture.

connector. This will allow the jumper wire to be

inserted into the breakout T. Ensure that the jumper

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

wire is inserted into the breakout T and that the full

Monitor the "Active Diagnostic Code" screen.

wiring harness is attached.

Wait at least 15 seconds for activation of the

code.

Refer to Illustration 97 for the engine harness

connector P2.

An open circuit diagnostic code should be active

for the suspect sensor.

Expected Result:

Note: When the engine harness is disconnected, all

Open circuit diagnostic codes are active when the

of the open circuit diagnostic codes for the pressure

jumper is removed. Short circuit diagnostic codes

sensors will be active. This is normal. Disregard the

are active when the jumper is installed.

diagnostic codes for the pressure sensors.

Results:

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

OK The ECM is working properly. Proceed to

E. Fabricate a jumper wire 150 mm (6 inch) long.

Crimp a Deutsch socket to both ends of the wire.

Test Step 8.

Not OK One of the following conditions exists:

F. Install the jumper wire on the ECM pin terminal.

Insert the jumper wire between the terminal for

The open circuit diagnostic code is not active

the suspect sensor signal and the common

when the harness is disconnected. The short

connection for the engine temperature sensor

circuit diagnostic code is not active when the

(terminal 18).

jumper wire is installed.