PROTECTOR-SIDE BAR 1250800 - Caterpillar

Note: Ensure that the desired diagnostic code (CID FMI) is on hold. Ensure that the "SERV CODE" indicator is ON. Find the connector contact that is located on the Main Display Module. Use the electrical system schematic for the engine that is being serviced to find the connector contact that corresponds to the CID that is shown.This diagnostic code is recorded when the Main Display Module reads a signal from the sender that is too low. The Gauge Needle will be in the warning region as a result of this diagnostic condition. The following examples are possible causes.
The engine oil temperature sender has a problem.
The sender signal circuit that is located in the engine is shorted to ground.
The Main Display Module has a problem.Note: The Main Display Module is unable to determine when a sender or the signal harness circuit of a sender is open or the resistance is too high. As a result of this condition, a Gauge Needle will always be on the far left of the scale. This condition is recognized as a gauge with a needle that is always at the far left of the scale.
Measure the Resistance of the Sender.
Turn the "ECS" switch to the OFF/RESET position.
Disconnect the engine harness from the sender.
Measure the resistance that is between the threads of the terminal and the case of the sender. The following table illustrates the correct approximate resistance for the following temperatures.
Table 1
Approximate Resistances For The Sender Connector Contacts    
Temperature     Resistance    
54.4 °C (130.0 °F)     850 to 1050 Ohms    
110 °C (230 °F)     140 to 160 Ohms    
Check the Display Area and the Harness.
Turn the "ECS" switch to the OFF/RESET position.
Check for loose connections or corroded connections to the sender.
Replace the corroded contacts and tighten the loose connections.
Turn the "ECS" switch to the COOLDOWN/STOP position. The "SERV CODE" indicator should be ON for the diagnostic code CID 0175 FMI 04.
Disconnect the engine harness from the sender.
Observe the "SERV CODE" indicator.Expected Result: The "SERV CODE" indicator should turn OFF.Results:
OK - The "SERV CODE" indicator turns OFF. The sender has a problem. Replace the sender.
Not OK - The "SERV CODE" indicator stays ON. The harness wiring or the Main Display Module has a problem. Proceed to Step 3.
Check the Sender Wire for a Short to Ground.
Turn the "ECS" switch to the OFF/RESET position.
Disconnect the engine harness from the sender.
Turn the "ECS" switch to the COOLDOWN/STOP position.
Measure the voltage from ground to the sender.Expected Result: The voltage should be 6.0 0.5 DCV.Results:
OK - The voltage is 6.0 0.5. If the SERV CODE indicator is still ON, repeat Step 1 through STEP 3. If the cause of the diagnostic fault is not found, replace the Main Display Module.
Not OK - The voltage is less than 0.5 DCV. The harness wiring has a problem. There is an open circuit or a short to ground in the signal wire for the sender, or a poor terminal connection or a poorly