PIN 1762278 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following diagnostic codes:
339-5 Engine Pre-Lube Pressure Switch current below normalThis procedure troubleshoots the circuit for the prelubrication pressure switch. Refer to Troubleshooting, "Prelubrication System" in order to troubleshoot the output circuit for the prelube relay.The prelubrication system is an option on these engines. If Caterpillar did not supply the prelube system, the prelube system is disabled. The following diagnostic and event codes are disabled:
E233(3) Low Engine Pre-Lube Pressure
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 normalAlso, if the "Engine Pre-Lube Time Out Period" parameter is programmed for a time period of zero seconds, the diagnostic and event codes that are mentioned above are disabled. The engine will crank without the prelubrication.In order for the prelube system to be enabled, the "Engine Pre-Lube Time Out Period" parameter must be programmed for a time period that is between 30 and 300 seconds.The prelube pump will not operate if the emergency stop button is activated or if the engine speed is greater than 0 rpm.During the prestart, the Electronic Control Module (ECM) will energize the prelube pump before cranking the engine in order to provide lubrication to the engine bearings. If the prelubrication of the engine is required, the ECM will provide +Battery voltage to the prelube relay. The prelube relay provides pressurized air or gas to the prelube pump motor. The prelube pump pressurizes the engine's lubrication system with oil. After activation, the prelube system will operate until one of the following occurrences:
Activation of the prelubrication pressure switch
Completion of the programmed "Engine Pre-lube Time Out Period"
Activation of the emergency stop buttonThe ECM monitors the prelubrication pressure switch in order to verify adequate lubrication of the engine prior to start-up. The pressure switch is normally open. The pressure switch closes when the prelube pump raises the engine oil pressure to 9 3 kPa (1.3 0.4 psi). When the pressure switch closes, sufficient oil pressure has been detected in order to initiate engine starting. After the pressure switch closes, the prelube pump continues to operate for a duration that is equal to the programmed "Engine Pre-Lube Time Out Period". The engine starting sequence continues when the engine prelube sequence is complete.If the ECM does not detect a signal from the pressure switch within the programmed period of time, the ECM monitors the engine oil pressure sensor in order to determine whether lubrication has occurred. If the prelubrication does not occur, an E233 Low Engine Pre-lube Pressure is generated. The starting sequence is terminated.The prelube pump can also be operated with a manual switch. When the switch is closed, a +Battery signal is sent to the ECM. The ECM provides +Battery voltage to the prelube relay until one of these conditions occur:
Activation of the prelubrication pressure switch
Deactivation of the manual prelube switch
Activation of the emergency stop buttonThe prelubrication system also operates after shutdown. This ensures that the turbocharger has adequate