0389768 JOHNSON LEAF PLAT ASSEMBLY

Illustration 1 g01250708
Schematic of the prelubrication system
Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET position. Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g01391955
Location of the components for the prelubrication system
(1) J1/P1 ECM connectors
(2) Prelubrication pressure switch
Thoroughly inspect ECM connectors (1) and the connector for switch (2).
Check the allen head screw for each of the ECM connectors for the proper torque.
Illustration 3 g01391976
Terminal locations on the P1 ECM connector for prelubrication switch
(P1-30) Return
(P1-60) Prelubrication pressure switch
Illustration 4 g01155187
Terminal locations at the connector for the prelubrication pressure switch
(Terminal 1) Prelubrication pressure
(Terminal 2) Return
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the prelube system.
Check the harness and wiring for abrasion and for pinch points from the prelube pressure switch to the ECM. Expected Result:All connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - All connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points. The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - At least one of the connectors, pins, or sockets is not connected properly. At least one connector or wire has corrosion, abrasion, and/or pinch points. The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Check for Diagnostic Codes
Establish communication between Cat ET and the engine ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Observe the "Diagnostics" screen on Cat ET. Note: If there is an active 338-5 Engine Pre-Lube Pump Relay current below normal, proceed to the “Results” for this Test Step. Otherwise, continue this procedure.Determine whether the following diagnostic codes are logged:
338-5 Engine Pre-Lube Pump Relay current below normal
338-6 Engine Pre-Lube Pump Relay current above normal
339-5 Engine Pre-Lube Pressure Switch current below normalExpected Result:None of the diagnostic codes are logged.Results:
OK - None of the codes are logged.Repair: There may be an intermittent electrical problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Logged 339-5 - There is a logged 339-5 diagnostic code. Proceed to Test Step 3.
Logged 338-5 or 338-6 - There is a logged 338-5 or 338-6 diagnostic code.Repair: There is a problem in the circuit for the prelubrication pump. Refer to Troubleshooting, "ECM Output Circuit (Prelubrication Oil Pump)".STOPTest Step 3. Check for the Proper Operation of the Prelubrication Pressure Switch
Set the engine control switch to the OFF/RESET position.
Disconnect the prelubrication pressure switch from the engine harness. Remove the prelubrication pressure switch from the cylinder block.
Install a tee that has 1/4-18 NPTF threads into the cylinder block's port for the pressure switch. If a tee cannot be installed into the port, install a flexible hose that has the appropriate fitting into the port and attach the tee to the hose.Install the pressure switch into one side of the tee. Attach a pressure gauge to the other side of the tee.
Connect an ohmmeter to the terminals on the pressure switch's connector. Measure t