GUARD GP-BOTTOM 2192499 - Caterpillar

portion of the memory within the GSC stores the setpoints of important conditions of the genset. The setpoints are found in the following service modes: "Engine/Generator Programming" (OP5), "Spare Input/Output Programming" (OP6) and "Voltmeter/Ammeter Programming" (OP8). The GSC detects a CID 268 when the data for the setpoint is invalid or out of range. After detecting a CID 268, the GSC sets the affected setpoints to the default value. For more information regarding setpoints and default values, see the following topics:
Systems Operation, "Engine/Generator Programming OP5"
Systems Operation, "Spare Input/Output Programming OP6"
Systems Operation, "Voltmeter/Ammeter Programming OP8"ProcedureElectrical interference is a possible cause of a CID 268 FMI 2.This procedure is for a CID 268 that is active or inactive. Clear the diagnostic code from the fault log after troubleshooting is complete.The GSC treats a CID 268 as an alarm fault or a shutdown fault. This will depend on the particular setpoint with the incorrect data. The setpoint for the ring gear teeth (P09) and the setpoint for the engine overspeed (P10) are treated as shutdown faults when the particular data is corrupted. All other setpoints are treated as alarm faults when the particular data is corrupted.Note: If the fault shutdown indicator is FLASHING and the 6 to 9 jumper is NOT installed on the ECS, then the jumper must be temporarily installed. The GSC setpoints must be programmed in OFF/RESET when a fault shutdown is active. If the fault alarm indicator is FLASHING the GSC can be programmed with the ECS in any position.
Check the setpoints.
View the setpoints that are stored in the memory of the GSC. See Systems Operation, "Engine/Generator Setpoint Viewing OP2".
Also check the spare input/output programming (OP6) and the voltmeter/ammeter programming (OP8).
Compare the stored setpoints to the specified setpoints of the particular genset. Expected Result: The stored setpoints and specified setpoints should match. Results:
OK - All the setpoints match. Start the engine. Verify that the CID 268 FMI 2 is active. If the fault remains active, replace the GSC. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". If the fault was inactive prior to performing this procedure, then these steps should have corrected the fault. STOP.
NOT OK - One or more of the setpoints do not match. Program the setpoints. See Systems Operation, "Engine/Generator Programming OP5", Systems Operation, "Spare Input/Output Programming OP6", and Systems Operation, "Voltmeter/Ammeter Programming OP8". STOP.