Miscellaneous Engine System Information; Gm 1.6L Gasoline Fuel System Description - Nilfisk-Advance SR 1900 Troubleshooting Manual

ENGINE SYSTEM

MISCELLANEOUS ENGINE SYSTEM INFORMATION

Additional Engine Troubleshooting Symptom
Engine Overheating
Use the checklist below as a guide, to thoroughly check the engine cooling system.
• Check coolant level in overflow tank and radiator.
• Inspect and clean radiator and hydraulic oil cooler.
• Check for proper operations of the belt driven engine cooling fan (slippage).
• Check to see that the engine thermostat opens.
• Check for proper operation of water pump.
• Check engine crankcase oil level.
Over Temperature Protection: The GM 1.6L engine will set a diagnostic test code (DTC 116) after 5 sec. at temperatures over 215 °F and a power
derate level one will be enforced. This engine fault will limit the maximum throttle position to 50%. With further overheating the engine will set a
code (DTC 217) after 10-15 sec. at temperatures over 225 °F and the engine will then shut down.
Loss of Oil Pressure Protection: Engine shutdown if oil pressure is only 3-7 PSI.
4 Cylinder Engine G/P/D Speed Settings
Fast Engine Speed 2400 RPM
Idle Engine Speed 1200 RPM

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 sensor
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" orifice 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 inline fuel pump. Fuel exits the fuel pump, passes through the filter and
then enters the fuel pressure and temperature manifold assembly. Fuel flows through the feed circuit and is delivered to the fuel injector rail. Fuel
that enters the bleed circuits through the by-pass valve in the manifold is returned to the fuel tank.
FORM NO. 56043129 - SR 1900 - 55