Test Step 6. Use a Voltmeter to Check the A/C Pressure Switch

216

TM 9-2320-312-24-2

Troubleshooting Section

110-00 High Coolant Temperature Warning

Expected Result:

110-11 Very High Coolant Temperature

The resistance measures 10 Ohms or less.

110-03 Coolant Temp Sensor Open Circuit

Results:

110-04 Coolant Temp Sensor Short Circuit

Yes The ECM, the A/C high pressure switch,

and the wiring are electrically OK.

Record any logged diagnostic codes. Record

any active diagnostic codes.

Repair: Check the A/C pressure or send the

vehicle to the OEM dealer for repairs.

Expected Result:

STOP.

Result 1 None of the diagnostic codes that are

listed are logged or active.

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

Repair: Replace the A/C high pressure switch.

logged or active.

Verify that the repair eliminates the problem.

Result 3 Diagnostic code 110-03 or 110-04 is

logged or active.

STOP.

Results:

Result 1 Proceed to Test Step 8.

Result 2 The cooling fan is ON because of a

high coolant temperature.

Repair: Perform either of the following diagnostic

procedures: Troubleshooting, "0110-00 High

Coolant Temperature Warning" Troubleshooting,

"0110-11 Very High Coolant Temperature"

STOP.

Result 3 The cooling fan is ON because of a

coolant temperature sensor fault.

Repair: Perform the following diagnostic

procedure: Troubleshooting, "Engine Temperature

Sensor Open or Short Circuit - Test"

STOP.

Test Step 6. Use a Voltmeter to Check the

A/C Pressure Switch.

A. Connect ET to the cab data link connector.

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

C. Ensure that the A/C high pressure switch is

disconnected from the vehicle harness at the

switch terminals.

D. Connect a multimeter and measure the

resistance between the two terminals of the A/C

high pressure switch. The switch must be closed

in order to check the resistance.