0110-03 Coolant Temp Sensor Open Circuit (27)

120

TM 9-2320-312-24-2

Troubleshooting Section

D. Insert the sensor and the thermocouple probe

B. Connect ET to the cab data link connector.

from the 6V-9130 Temperature Adapter into

a container of hot water. Again, compare

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

the temperature reading from the sensor to

the temperature reading of the 6V-9130

D. Note the temperature for the sensor on the ET

Temperature Adapter.

status screen.

E. Start the engine but remain parked.

Expected Result:

The two measurements are within 15 C (27 F) of

F. Monitor the temperature for the sensor that is

being checked on the ET status screen as the

each other.

engine is warming.

Note: Do not expect the sensor and the

thermocouple probe from the 6V-9130 Temperature

Expected Result:

Adapter to respond to the temperature change at

The temperature before starting the engine should

the same rate.

be within reasonable limits, and the temperature

increases as the engine warms.

Results:

Yes The sensor is functioning correctly. If

Note: The engine may require several hours to cool

down depending on the ambient air temperature

a problem is still suspected the problem is a

around the vehicle.

mechanical problem. The problem is not an

electronic problem.

Results:

Repair: Perform the following diagnostic

Yes The sensor is functioning correctly. If

procedure:

a problem is still suspected the problem is a

Refer to Troubleshooting, "Troubleshooting without

mechanical problem. The problem is not an

a Diagnostic Code" for a procedure that best

electronic problem.

describes the conditions.

Repair: Perform the following diagnostic

procedure:

STOP.

Refer to Troubleshooting, "Troubleshooting without

a Diagnostic Code" for a procedure that best

describes the conditions.

Repair: Perform the following diagnostic

procedure:

STOP.

1. Temporarily install another sensor.

No Proceed to Test Step 5.

2. Repeat this test step.

Test Step 5. Compare the Temperature

Reading to the Temperature from Another

3. If the problem is resolved with the new sensor,

Gauge.

replace the sensor.

4. Verify that the repair eliminates the problem.

A. Remove the temperature sensor from the engine.

STOP.

B. Connect the sensor to the engine harness. Insert

the sensor and the thermocouple probe from the

6V-9130 Temperature Adapter into a container

i01638799

of water that is room temperature. Allow three

0110-03 Coolant Temp Sensor

minutes for the sensor and the probe to respond

to the temperature of the water.

Open Circuit (27)

C. The ET status screen will display the temperature

SMCS Code: 1408-081; 1906-038

reading from the sensor. Compare the

temperature reading to the temperature reading

Conditions Which Generate This Code:

from the 6V-9130 Temperature Adapter. The

temperature reading from the sensor can also

The coolant temperature signal voltage is above the

be compared to the temperature gauge on the

acceptable range.

dash of the truck.