INDICATOR-OIL TEMPERATURE 1W7556 - Caterpillar

System Operation Description:Use this procedure under the following conditions:Use this procedure if another procedure has directed you here. Also use this procedure if any of the following diagnostic codes are active:
1684-04 Fuel Injection Pump voltage below normal
1684-07 Fuel Injection Pump not responding properly
1684-11 Fuel Injection Pump other failure mode
1684-14 Fuel Injection Pump special instruction
174-02 Fuel Temperature Sensor erratic, intermittent, or incorrect The following background information is related to this procedure:The fuel injection pump receives an electrical supply from the electrical system on the machine and from the relay for the fuel injection pump through the Machine Interface Connector (MIC).A loss of power to the fuel injection pump can occur on either the positive side or the negative side of the pump.The positive side is supplied from the pump power relaythrough the Voltage Load Protection Module (VLPM) to the fuel injection pump.The positive supply includes an in-line 30 amp fuse in order to protect the circuit. The negative side is connected directly to the battery.Note: The engine protection system (if equipped) and the engine shutdown system (if equipped) have the ability to disconnect the electrical power from the fuel injection pump. The engine protection system will disconnect the electrical power supply to the Electronic Control Module (ECM). The loss of electrical power to the engine will cause the engine to shutdown. The engine protection devices can be at fault when the engine is difficult to start. Some engine protection systems will not supply power to the system until the crankshaft rotates, and the oil pressure achieves a safe level or until an override button is activated. These devices may be the cause of intermittent power loss or a complete loss of power to the fuel injection pump.
Illustration 1 g01332964
Schematic for the fuel injection pump (31 pin MIC)
Illustration 2 g01332970
Schematic for the fuel injection pump (70 pin MIC)
Test Step 1. Check the Battery Voltage
Measure no-load battery voltage at the battery terminals. Expected Result:The battery voltage should be no less than 11.0 volts for a 12 volt system. The battery voltage should be no less than 22.0 volts for a 24 volt system.Results:
OK - Proceed to Test Step 2.
Not OK - The battery voltage is below normal.Repair: Recharge the batteries or replace the batteries. Use the electronic service tool to clear any logged diagnostic codes and then verify that the repairs have eliminated the fault. STOPTest Step 2. Inspect the Electrical Connectors and Wiring
Illustration 3 g01625524
Pin locations on the 31 pin MIC
(3) Fuel pump power control
(4) Fuel pump battery -
(8) Fuel pump battery +
Illustration 4 g01332968
Pin locations on the 70 pin MIC
(42) Fuel pump power control
(48) Fuel pump battery +
(58) Fuel pump battery -
Thoroughly inspect the following terminal connections on the P40 Fuel Injection Pump Connector:
P40:6 Pump Supply -
P40:7 Pump Supply +Refer to Troubleshooting, "Electrical Connectors - Inspect".
Inspect the terminals on the VLPM connector.
On