BOLT-SOCKET HEAD 8T1160 - Caterpillar

System Operation Description:The coolant temperature sensor measures engine coolant temperature. The Electronic Control Module (ECM) uses the information to modify the engine operation for cold operation. The ECM also uses this information to alert the operator of a high coolant temperature.The following cold start strategy is activated when the coolant temperature is below 60 °C (140 °F).
Cold mode is deactivated if the engine has been running for five minutes.
Cold mode is deactivated when the engine speed increases above 1200 rpm.
The rack position is limited to 5 mm (0.20 inch) during engine start-up (0 - 500 rpm).The coolant temperature sensor requires +8 VDC to operate. This supply voltage is also used by the coolant level sensor and the rack position sensor. A malfunction with the coolant temperature sensor or the wiring of the sensor can cause problems with these sensors.
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