Nilfisk-Advance 56110000, Service Manual

Page: 68 / 102

68 - FORM NO. 56043124 - Condor XL
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ENGINE SYSTEM
MISCELLANEOUS ENGINE SYSTEM INFORMATION
Engine Overheating Problems
Use the checklist below as a guide to thoroughly check the engine cooling system.

Check the coolant level in the over fl ow tank and radiator.

Inspect and clean the radiator and hydraulic oil cooler.

Check for correct operation of the belt-driven engine cooling fan (slippage).

Check to see that the engine thermostat opens.

Check for correct water pump operation.

Check the engine crankcase oil level.
Over-temperature Protection
The GM 1.6L engine will set a diagnostic test code (DTC 116) after fi ve seconds at temperatures over 215 °F, and the ECM will derate the engine
power to level one (maximum throttle position of 50%). If the engine continues to overheat, it will set a code (DTC 217) after 10-15 seconds at
temperatures over 225 °F, then the engine will shut down.
Loss of Oil Pressure Protection
The engine will shut down if the oil pressure drops to 3-7 psi.
GM 1.6L GASOLINE FUEL SYSTEM DESCRIPTION
This engine is equipped with a fuel injector rail that does not have a pressure regulator. Fuel pressure for this engine is regulated by the engine’s
ECM controlling the fuel pump via pulse width modulation. The ECM receives fuel pressure and temperature feedback from the gasoline fuel sen-
sor manifold and uses this information to control the ground side of the fuel pump. Fuel pressure is regulated by the ECM pulse width modulating
(PWM) the fuel pump. The fuel pressure and temperature sensor manifold has a return or “bleed” circuit that is comprised of a .020” ori
fi ce and a 6
psi check valve that connects back to the equipment fuel tank. This circuit is used to bleed off any vapor that develops in the line and returns a small
amount of fuel to the tank. The fuel comes from the fuel tank and passes through the in-line fuel pump. Fuel exits the fuel pump, passes through the
fi lter and then enters the fuel pressure and temperature manifold assembly. Fuel fl ows through the feed circuit and is delivered to the fuel injector
rail. Fuel that enters the bleed circuits through the bypass valve in the manifold is returned to the fuel tank.