PUMP GP-FUEL PRIMING 7C4833 - Caterpillar

With EUI (5XM, 3LS),
3508B (4GM, 6PN, 2HW, 1FZ),
3512 With EUI (6PM, 3MS),
3512B (8RM, 6WN, 4AW, 1GZ),
3516 With EUI (7KM, 3NS),
3516B (6HN, 7RN, 1NW, 2JW, 1HZ) Generator Set;
3508B (5PS),
3512B (3ZW),
3516B (6HZ) Locomotive;
3508 With EUI (3PS),
3508B (2BM, 7SM, 1TW),
3512 With EUI (3RS),
3512B (7HM, 4TN, 2GW),
3516 With EUI (3SS),
3516B (8CN, 8KN, 3CW, 4BW) Marine;
3508 With EUI (3TS),
3508B (3DM, 3DW),
3512 With EUI (3WS),
3512B (8EM, 1PW),
3516 With EUI (3XS),
3516B (9AN, 2FW) Marine Auxiliary EnginesReference: Engine News, August 1999, Page 6, "New Governor Control (Load Share Module) for Generator Set Engines"Description of Change: Several improvements have been made to the software on these engines. The primary result of these improvements is the elimination of false alarms and error codes. Some of these changes are applicable to all 3500 Commercial Engines. Some changes are specific to 3500 Marine Engines, and some changes are specific to 3500 Marine Auxiliary and 3500 Generator Set Engines. These improvements are discussed below. Changes That Are Common To All Commercial Engines
1. The pressure sensor signals are now filtered electronically. Electronic filtering helps reduce erratic signals and provides the following results:* Helps eliminate false "air inlet restriction" events* Helps eliminate false "high crankcase pressure" events* Stabilizes fuel pressure readings* Stabilizes oil pressure readings2. A change was made to eliminate false logging of 94-02 and 289-02 (fuel pressure sensor installed incorrectly) codes. Some engines, that are equipped with duplex filters, would log these codes if the engine was shut down while the Electronic Control Module (ECM) was still powered. The new software requires a minimum engine speed of 200 rpm before the 94-02 and 289-02 codes can be registered. The following circumstances most likely indicate that the fuel pressure sensors are installed incorrectly (the "filtered" sensor and the "unfiltered" sensor might be reversed):* The new software does not eliminate the 94-02 and 289-02 codes.* The 94-02 or 289-02 codes are active, but the engine does not have the duplex filters option.* The 94-02 and 289-02 codes become active INITIALLY when the engine is running.* The unfiltered fuel pressure is lower than the filtered fuel pressure, when viewed on the ET Status Screen. For better resolution, use metric units (kPa) rather than English units (psi) when checking fuel pressure on the ET Status Screen.Changes To Marine Engines Only
1. A change has been made in order to help eliminate intermittent "!STOP" light flashing on the EMS II module. Intermittent "!STOP" light flashing, which would occur without logging an event code, affects only marine propulsion engines. Marine propulsion engines are equipped with a primary ECM and a backup ECM. This arrangement requires a unique communication strategy between the two ECMs. The "!STOP" light would flash when the backup ECM status changed from "ready" to "not ready". The software has been upgraded to eliminate the false "not ready" condition in the backup ECM.2. Incorrect 248-02 (data erratic, intermittent, or incorrect) diagnostic codes have been resolved. This problem had occurred on engines that are equipped with the Pilothouse Control Panel option. The problem occurred because of an