PLATE AS 3916295 - Caterpillar

Table 1
Diagnostic Code    
Code and Description    Flash Code    Default Conditions which Generate this Code    System Response    
110-03 Coolant Temperature voltage high     27     Voltage is above 4.7 VDC. Also, there are no sensor supply diagnostic codes.     The diagnostic code is logged. Also, the coolant temperature is set to a default value of
0 °C (32 °F).    
110-04 Coolant Temperature voltage low     27     Voltage is less than 0.3 VDC. Also, there are no sensor supply diagnostic codes.     The code is logged. Also, the alarm lamp is illuminated.    
Illustration 1 g01625463
Illustration 2 g01635493
(10) +8 VDC (20) Coolant temperature (35) Analog returnUse this procedure to troubleshoot any suspect problems with the circuit for the coolant temperature sensor.Test Step 1. Inspect the Electrical Connectors and the Wiring Harness
Remove electrical power from the ECM.
Thoroughly inspect the connector for the coolant temperature sensor and the P12 connector. Inspect the ECM connector J14/P14. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the coolant level sensor.
Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Open or Short Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Turn the engine control switch to the ON position. The engine should remain off.
Check for active diagnostic codes 110-03 or 110-04.Expected Result:There are no active diagnostic codes.Results:
OK - There are no active diagnostic codes. Proceed to Test Step 3.
Not OK - The service tool shows an active 110-03 or 110-04 code.Repair: Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test ".STOPTest Step 3. Check the Supply Voltage at the Sensor Connector
Disconnect the coolant temperature sensor.
Restore electrical power to the ECM.
Illustration 3 g01356605
Harness connector for the coolant level sensor (A) +8 VDC (B) Return (C) Signal
Measure the voltage between terminals (A) and (B) at the harness connector for the coolant temperature sensor.
Remove electrical power from the ECM.Expected Result:The voltage measurement is +8.0 0.4 VDC.Results:
OK - The voltage measurement is +8.0 0.4 VDC. The supply voltage is reaching the sensor. Proceed to Test Step 5.
Not OK - The voltage measurement is not +8.0 0.4 VDC. The digital sensor supply voltage is not reaching the sensor. Proceed to Test Step 4.Test Step 4. Check the +8 Volt Supply Voltage at the ECM
Disconnect the J14/P14 ECM connector.
Fabricate