Test Step 2. Check the Programming of the "Fan Control Type" Parameter -807640379

201

TM 9-2320-312-24-2

Troubleshooting Section

"A/C Switch Fan On-Time"

Results:

OK Proceed to Test Step 2.

Ensure that the "A/C Fan Request" parameter

is programmed to "J1/P1:41" or "J1/P1:62". If

Not OK

the "A/C Fan Request" is not programmed to

"J1/P1:41" or "J1/P1:62", the A/C compressor

clutch will not turn on the fan .

Repair: Repair the wiring or replace the wiring, if

necessary. Repair the connectors or replace the

Ensure that the "A/C Switch Fan On-Time"

connectors, if necessary. Ensure that all of the

parameter is programmed to a value that is

seals are in the proper place. Ensure that all of

between "0" and "600". If this parameter is

the connectors are connected properly.

programmed to "0", Input #11 is not used.

Verify that the repair eliminates the problem.

Note: If the "Fan Control Type" parameter indicates

"None", then the cooling fan driver is not used.

STOP.

ECM not wired to fan or switch If the cooling fan

Expected Result:

on the vehicle is not wired to the ECM then the

All three parameters are programmed correctly.

ECM is not being used for fan control. STOP.

Test Step 2. Check the Programming of

Results:

the "Fan Control Type" Parameter.

Yes The parameters are programmed correctly.

Proceed to Test Step 4.

A. Connect an electronic service tool to the cab

data link connector.

No Change the parameters to the correct

settings. Proceed to Test Step 4.

B. Check the "Fan Control Type" parameter. Ensure

that the parameter is programmed to"On-Off",

Test Step 4. Use the Electronic Service

if the ECM is used to control the fan. If the

Tool to Check Active Codes or Logged

parameter is programmed to "None" and the

Codes.

ECM is connected to the fan, then the fan will

always be ON.

A. Connect the electronic service tool to the cab

Expected Result:

data link connector.

The "Fan Control Type" parameter is programmed

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

to match the vehicle wiring. This is determined in

the previous step.

C. Access the logged diagnostic codes and the

active diagnostic codes onthe electronic service

Results:

tool.

Yes Proceed to Test Step 3.

D. Check for the following diagnostic codes.

No Program the "Fan Control Type" to the

110-00 High Coolant Temperature Warning

correct setting and then recheck the system. If

conditions are not resolved, then proceed to Test

110-11 Very High Coolant Temperature

Step 3.

110-03 Coolant Temp Sensor Open Circuit

Test Step 3. Use the Electronic Service

Tool to Verify that the Parameters are

110-04 Coolant Temp Sensor Short Circuit

Correctly Programmed.

Record any logged diagnostic codes. Record

any active diagnostic codes.

A. Connect the electronic service tool to the cab

data link connector.

Expected Result:

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

Result 1 None of the diagnostic codes that are

listed are logged or active.

C. View the following Customer Specified

Parameters.

Result 2 Diagnostic Code 110-00, or 110-11 is

"Fan Control Type"

logged or active.

"A/C Fan Request"