COVER AS 4886579 - Caterpillar

Illustration 1 g02053753
Typical schematic of the circuit for the indicator lamps
Illustration 2 g02053754
Pin locations for the indicator lamps on the P1 connector (1) Ground (GND) (2) Ground (GND) (3) Ground (GND) (9) Ground (GND) (10) Ground (GND) (7) Battery (+) (8) Battery (+) (15) Battery (+) (16) Battery (+) (17) Maintenance lamp (19) Shutdown lamp (40) Keyswitch (59) Derate lamp (60) Warning lamp (61) Low oil pressure lamp (62) High coolant temperature lamp (63) Overspeed lamp (64) Diagnostic lampTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect P1 connector and the lamp connections. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the customer connector and the ECM connector that are associated with the diagnostic lamp.
Check the screw for the P1 connector for the correct torque of 5.0 N m (44 lb in).
Check the harness for abrasions and for pinch points from the battery to the ECM.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the fault.STOPTest Step 2. Inspect the Lamp, the Fuse, and the Power Supply
Disconnect the lamp from the harness. Inspect the lamp in order to determine if the lamp has failed.
Measure the resistance across the two terminals of the lamp. If the resistance is more than 2000 Ohms, the bulb has failed.
Check the battery by connecting a test lamp across the terminal of the battery.Expected Result:The lamp has less than 2000 Ohms and the power supply is OK.Results:
OK - The lamp appears to be operating correctly at this time. Proceed to Test Step 3.
Not OK - Repair: Replace the suspect component or repair the suspect component. Verify that the repairs have eliminated the fault.STOPTest Step 3. Measure the Input to the Lamp at the Lamp Socket
Turn the keyswitch to the ON position.
Use the electronic service tool to select the "Override" function in order to switch individual lamps ON and OFF.Note: The "Override" function is contained in the "Diagnostics" menu of the electronic service tool.
Measure the voltage at the lamp socket.Expected Result:The voltage should be between 12.0 Volts DC and 24.0 Volts DC.Results:
OK - The voltage is between 12.0 Volts DC and 24.0 Volts DC.Repair: Replace the bulb.Verify that the repair eliminates the fault.If the fault persists, measure the resistance across the 2 terminals of the lamp. If the resistance is more than 2000 Ohms, the replacement bulb has failed. Replace the bulb and repeat the test. If the fault persists, proceed to Test Step 4.
Not OK - The voltage is not in the range that is expected. Proceed to Test Step 5.Test Step 4. Test the Individual Lamp Circuits
Disconnect the P1 connector.
Temporarily disconnect the wire from the P1 connector that supplies the suspect lamp.
By using a jumper wire, connect the removed