VALVE-EXPANSION 3065618 - Caterpillar

Illustration 5 g01367257
Terminal locations at the engine interface connector that are for the lamp circuits (Terminal 20) Low coolant level lamp (Terminal 21) High coolant temperature lamp (Terminal 22) Maintenance indicator lamp (Terminal 23) Low oil pressure lamp (Terminal 24) Diagnostic lamp (Terminal 25) Warning lamp
Table 1
Troubleshooting Test Steps     Values     Results    
1. Inspect the Electrical Connectors and the Wiring
A. Remove electrical power from the ECM.
B. Thoroughly inspect connectors (1), (2), and (3). Also, thoroughly inspect any of the other connectors that are associated with the lamp circuits. Refer to the Schematic of the engine for connector locations. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a
45 N (10 lb) pull test on each of the wires for the lamp circuits.
D. Check the torque of the allen head screw on the ECM connectors and the engine interface connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
E. Check the harness and the wiring for abrasion and for pinch points from the dash display back to the ECM.    
All of the 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.    
Result: The harness and connectors appear to be in good repair.
Proceed to Test Step 2.
Result: The connectors and/or wiring need repair.
Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are coupled completely. Verify that the repair eliminates the problem.    
2. Check for Proper Operation of the Lamp Circuits
A. Connect Cat ET to the service tool connector.
B. Restore electrical power to the ECM. Turn the keyswitch to the ON position.
C. Select the "Override Parameters" option from the "Diagnostic Tests"on Cat ET.
D. Use the correct override parameter to power the circuit for the suspect lamp.
E. Remove electrical power from the ECM. Turn the keyswitch to the OFF position.    
The suspect lamp illuminates when the override is turned on.
   
Result: The suspect lamp illuminates when the override is on.
There does not appear to be a problem with the lamp circuit at this time. The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Result: The suspect lamp does not illuminate when the override is on.
Inspect the lamp and the lamp socket for the suspect circuit. Use a lamp socket that is known to be operational to check the condition of the lamp, if necessary. If either of the components are questionable, replace the component. Retest the circuit. If the problem persists or if the components of the lamp assembly appear to be in good repair, proceed to Test Step 3.    
3. Use the Override to Check the Wiring Harness
A. Remove the lamp for the suspect circuit from the lamp socket.
B. Connect a test lamp between the terminal of the lamp socket that is for the