CRANKSHAFT AS 0R3010 - Caterpillar

Use this procedure to diagnose electronic faults in the oil pressure switch circuit.This procedure covers the following diagnostic code:
Table 1
Diagnostic Trouble Codes for the Oil Pressure Switch
J1939 Code Description Notes
100-2 Engine Oil Pressure : Erratic, Intermittent, or Incorrect When the keyswitch is in the ON position (engine not running), the oil pressure switch circuit should be closed.
This diagnostic code will be active when the Electronic Control Module (ECM) detects the following conditions:
The engine is not running.
The circuit for the oil pressure switch is open for at least 3 seconds.
The keyswitch has been switched on for at least 6 seconds.
The battery voltage is at least 10 VDC.
The warning lamp will come on.
The engine is equipped with an oil pressure switch. While the engine is running and oil pressure is detected, the switch will be open. When no oil pressure is detected, the switch will be closed.
Table 2
Oil Pressure Switch States and Diagnostics Summary
Engine Condition Oil Pressure Switch State Active Diagnostic Code
Not running Closed Normal condition (no oil pressure detected)
Running Open Normal condition (oil pressure detected)
Not running Open 100-2
Running Closed 100-17 Note: If a 100-17 diagnostic code is active, refer to Troubleshooting, "Oil Pressure Is Low" before returning to this procedure.
Illustration 1 g03733752
Schematic diagram for the oil pressure switch circuit
Illustration 2 g02710300
View of the pin location on the 62-pin engine interface connector for the oil pressure switch.
(3) Oil pressure switch
Illustration 3 g02710319
View of the pin location on the P2 connector for the oil pressure switch
(6) Engine oil pressure switch
Table 3
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2/J2 connector.
B. Thoroughly inspect the connector for the oil pressure switch.
C. Refer to Troubleshooting, "Electrical Connectors - Inspect".
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the connectors that are associated with the oil pressure switch.
E. Check the harness for abrasions and for pinch points from the oil pressure switch back to the ECM.
Damaged wire or connector
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Active or Recently Logged Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. Do not start the engine.
D. Check for any active or recently logged diagnostic codes. Wait at least 10 seconds for activation of the diagnostic codes.
Diagnostic codes
Result: A 100-17 diagnostic code is recently logged.
This diagnostic code indicates that the oil pressure is low, but can also be caused by a short circuit condition in the oil pressure switch circuit.
Repair: Check for engine oil pressure problems before returning to this procedure. refer to Troubleshooting, "Oil Pressure Is Low".
If the fault is still present, proceed to