SHIM 1772515 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with a prelubrication system or if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table    
Code and Description     Conditions which Generate this Code     System Response    
338-5 Engine Pre-Lube Pump Relay current below normal     The engine's Electronic Control Module (ECM) detects an open circuit at the prelube relay.
The ECM detects a short to battery voltage at the prelube relay.     The code is logged.    
338-6 Engine Pre-Lube Pump Relay current above normal     The ECM detects a short circuit at the prelube relay.    The ECM has the ability to automatically lubricate the engine before cranking. This may increase the life of certain engine parts by lubricating the parts before the starting motor is engaged.The prelubrication system is activated when the start/run/stop switch is turned to the START position. The ECM will not initiate the starting sequence until the ECM detects a low input on P1-66. The input P1-66 is for the prelubrication pressure switch. The prelubrication pressure switch is set to close at a predetermined pressure that is high enough to ensure that adequate pressure is in the system for lubrication. After the prelubrication pressure switch closes, the starting motor is allowed to energize. The start/run/stop switch must be left in the START position for the duration of the prelube cycle in order to ensure that the engine is properly lubricated before start-up.A test on Caterpillar Electronic Technician (ET) allows the technician to activate the prelube system. The test is functional only when the engine speed is zero rpm. The test is accessed by selecting the following menus on Cat ET:
"Diagnostics"
"Diagnostic Tests"
"Override Parameters"
Illustration 1 g01267717
Typical schematic
Illustration 2 g01213742
P1 ECM connector (P1-5) Digital return (P1-66) Pressure switch for the prelube system
Illustration 3 g01267718
P2 ECM connector (P2-12) Prelube relay
Illustration 4 g01267721
Machine interface connector (Terminal 09) Digital return (Terminal 32) Pressure switch for the prelube system (Terminal 40) Drive for the prelube relay
Illustration 5 g01234146
Location of ECM connectorsTest Step 1. Inspect the Electrical Connectors and the Wiring
Turn the switch that provides power to the keyswitch input for the ECM to the OFF position.
Turn the breaker for the ECM to the OFF position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors in the circuit. Refer to Troubleshooting, "Inspecting Electrical Connectors" for the proper procedure for inspecting system wiring.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK