21923974 Volvo.Penta Hose, red

Table 1
Event Code
Description Conditions which Generate this Code System Response
E498(3) Fuel Pressure Present During Initial Cranking The engine is cranking and the pressure switch for the prelube is closed. The Electronic Control Module (ECM) has energized the Gas Shutoff Valve (GSOV) but the ECM has not energized the fuel actuator solenoid. The air/fuel pressure module detects a differential pressure for fuel to air of at least 0.5 kPa (0.073 psi). The shutdown output is activated. The code is logged. Probable Causes
Hydraulic oil pressure switch is open
Air/Fuel pressure module
Fuel pressure is present during initial cranking.
Slow cranking
Cold engine
Excessive load
Incorrect starting position for the air choke
Inlet air restriction
Problem with the air/fuel mixture
Problem with the gas shutoff valve
Electrical connectors or power supply
No signal from the engine speed/timing sensor
Ignition systemRecommended Actions
Hydraulic Oil Pressure Switch Is Open
The hydraulic oil pressure switch contact must close when the engine starts cranking and the hydraulic oil pressure rises. To check the switch contact, perform the following procedure:
Disconnect the engine harness from the hydraulic oil pressure switch.
Connect multimeter leads to the switch outputs "A" and "B".Turn on the continuity function.
Crank the engine. The expected response is continuity between "A" and "B" when the hydraulic oil pressure rises.If there is no continuity between "A" and "B" while the hydraulic oil pressure rises, replace the switch.If the hydraulic oil pressure does not rise, refer to Troubleshooting, "Electrohydraulic System Oil Pressure Is Low".Air/Fuel Pressure Module
Perform a calibration procedure on the Air/Fuel pressure module. Refer to Troubleshooting, "Air/Fuel Pressure Module - Calibrate".Fuel Pressure is Present During Initial Cranking
If fuel pressure is present before the fuel command, the engine will not start.If an unexpected shutdown or a fast shutdown occurred, the fuel actuator may have remained open. If service was performed on the actuator, the actuator may have remained open. Before you crank the engine again, make sure that the actuator is closed.Inspect the fuel actuator and the actuator linkage. Inspect the rod ends for damage and/or for wear. Make sure that the components are fastened securely. Make corrections, if necessary.Make sure that the linkage is adjusted according to the engine Specifications, "Fuel Control".The fuel actuator may be stuck. Make sure that the actuator can move smoothly. Inspect the actuator according to Operation and Maintenance Manual, "Electrohydraulic Actuator - Inspect". Recondition the actuator, if necessary.Slow Cranking
The cranking speed must be sufficient for engine start-up. Inspect the starting system. Make sure that the air supply has sufficient pressure. If the starting motor is suspect, refer to Troubleshooting, "Air Starting Motor Problem".Note: The target minimum cranking speed is 80 rpm.Cold Engine
If the engine is too cold, the engine may not start. Refer to Application and Installation, LEKQ7249, "Ambient Considerations".Excessive Load
Make sure that the load is not excessive. Reduce the load. If necessary, disengage the driven equipment and test the engine.Air Choke
The air choke is maintained at a fixed position during start-up. If the air choke is closed too far, there may be insufficient air for combustion. If the air choke is opened too far, the air/fuel mixture may be too lean for combustion.Make sure that the programmable "Engine Start Choke Position" is correct. Refer to Systems Operation/Testing and Adjusting, "Electronic Control System Parameters".Inlet Air Restriction
The air filter elements may be plugged. For optimum operation, replace the air filter elements when the inlet air restriction reaches 2.5 kPa (10 inches of H2O). The maximum allowable inlet air restriction is 3.75 kPa (15 inches of H2O).If the inlet air restriction is excessive, determine the cause of the restriction and correct the condition.Air/Fuel Mixture
The following conditions can cause the engine to malfunction:
Low fuel pressure
High fuel pressure
Poor fuel quality
Incorrect air/fuel ratioMake sure that fuel is supplied at a sufficient pressure that is stable. Make sure that the size of the fuel line is sufficient. Inspect the fuel system for leaks. Inspect the fuel filter, the gas pressure regulator, the gas shutoff valve, and the gas shutoff valve solenoid.When possible, interview the operator in order to determine if fuel quality is in question. Try to determine if the source of the fuel was changed.Check the needle valves for the precombustion chambers. If the needle valves are closed, no fuel is supplied to the precombustion chamber. If the needle valves are open too far, the air/fuel mixture will be too rich for combustion.If the adjustment of the needle valves is suspect, fully close all of the valves. Open the needle valves for four full turns. Adjust the needle valves according to Systems Operation/Testing and Adjusting, "BTU and Precombustion Chamber Adjustments".Check the position of the air choke plate. The orientation of the plate is represented by the groove on the end of the shaft for the choke plate. The air choke is opened for start-up. If the air choke is closed, the air/fuel mixture will be too rich for combustion. If the air choke is open too far, the air/fuel mixture will be too lean. Make sure that the programmable starting position for the air choke is correct.During cranking, the fuel actuator begins to open at approximately 50 rpm. The actuator opens for approximately 5 to 10 percent of the full travel. If the actuator opens for more than 30 percent, the fuel pressure is probably too low.Make sure that the actuator and the linkage are operating properly. For information on maintaining the actuator, refer to the Operation and Maintenance Manual, "Electrohydraulic Actuator - Inspect". For information on troubleshooting the actuator, refer to Troubleshooting, "Fuel Actuator - Test".Gas Shutoff Valve
During cranking, measure the pressure in the fuel manifold. The gas pressure must be 1 to 10 kPa (0.15 to 1.5 psi). If the pressure is zero, the gas shutoff valve may not be operating properly. Refer to the Operation and Maintenance Manual, "Gas Shutoff Valve - Inspect".Electrical Connectors or Power Supply
There may be an intermittent interruption of power. Check the wiring harnesses and the connectors. Inspect the connectors in the terminal box. Inspect the battery connections and the ground.Inspect the wiring from the battery to the Electronic control Module (ECM). Inspect the