Table of Contents
Advertisement
108 ENGINE COMPONENT AND LOCATION
Inlet Air Heater
The optional inlet air heater mounts between the mixer and the inlet manifold. It is
activated when the operator turns the key to the preheater position and the engine
coolant temperature is lower than 10°C (50°F).
Operating time is controlled by the EECU. The operating relay is mounted on the inlet
manifold. A lighted icon on the instrument panel signals when the element is On.
EGR Diagnostics
The EECU commands the EGR valve position and monitors electric current consumed
by the EGR valve. An abnormally high reading indicates a jammed EGR valve. The
EECU verifies that its command was sent and that the valve position reflects the
command. If the valve is jammed, or its position doesn't change when commanded,
the EECU sets fault codes.
A degraded EGR cooler results in low efficiency. The EECU calculates efficiency by
comparing EGR gas temperature with engine coolant and exhaust temperatures. An
EGR cooler clogged with soot also causes a fault code to be set.
Hide quick links:
Advertisement
Table of Contents
