Test Step 7. Use the "Cooling Fan Solenoid Special Test" on the Electronic Service Tool to Check the Circuit

203

TM 9-2320-312-24-2

Troubleshooting Section

C. Access the status screen. Locate the "Coolant

Results:

Temperature" and the "Inlet Manifold Air

Yes The cooling fan circuit from the ECM to the

Temperature" status screen. Monitor the status

screen for a few minutes in order to verify that

solenoid is functioning properly at this time.

the temperatures are changing as the engine

warms up.

Repair: If a problem still exists, then the problem

is in the wiring that was installed by the OEM.

Repair the problem or send the vehicle to the

Expected Result:

OEM dealer for repair.

The "Coolant Temperature" and the "Inlet Manifold

Air Temperature" appear to have the correct

Verify that the repair eliminates the problem.

reading.

STOP.

Results:

No Proceed to Test Step 8.

Yes Proceed to Test Step 7.

Test Step 8. Use the "Cooling Fan

Solenoid Special Test" on the Electronic

Service Tool to Check the ECM.

Repair: Temporarily connect another sensor. Test

the new sensor by checking "Inlet Manifold Air

Temperature" and "Coolant Temperature" again. If

the problem is resolved with the new sensor, then

reconnect the old sensor in order to verify that

the problem returns. If the problem returns, then

replace the old sensor.

Verify that the repair eliminates the problem.

STOP.

Test Step 7. Use the "Cooling Fan

Solenoid Special Test" on the Electronic

Service Tool to Check the Circuit.

A. Connect the electronic service tool to the cab

data link connector.

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

C. Access the "Cooling Fan Solenoid Special Test".

g00841548

Illustration 63

Access each menu in the order that follows:

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

Diagnostics

B. Disconnect the ECM vehicle harness connector

Diagnostic Tests

J1/P1.

Special Test

C. Remove terminal 11 (Output 5) from the vehicle

harness connector P1.

Note: If any override switches are installed, the

switch must be in the OFF position.

D. Connect a Breakout T to the ECM connector J1

and vehicle harness connector P1.

D. Cycle the test to the ON position and to the OFF

position. Listen for the solenoid to click. You may

E. Connect a voltage test lamp between terminal

need to be near the engine in order to hear the

11 (Output 5) and terminal 67 (negative battery)

click of the solenoid.

of the breakout T.

Expected Result:

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

An audible clicking is heard, and the solenoid

G. Access the "Cooling Fan" test on the electronic

appears to be operating properly.

service tool.