TLD GPU-406, Manual

Page: 31 / 74

Creation: 01.31 - 2014 2-4-3
GPU - 406
GPU - 409
Engine and Controls (cont.)
PROBLEM CAUSE REMEDY
2. Engine will not start. Cranking
speed is low.
A. Low battery output A. Check for 24VDC across the
battery (BT1/BT2). Charge or
replace the battery if necessary.
B. Loose starting circuit
connections or faulty cables B. Check for loose terminals in the
starting circuit or corroded wiring.
Tighten the connections or
replace wiring if necessary.
C. Improper lubricating oil
viscosity C. Check the oil for proper
viscosity. See the engine manual
(Manufacturer’s Literature,
Chapter 5).
3. Engine will not start.
Cranking speed is normal.
A. Low fuel level A. Add fuel.
B. Defective check valve (V1) on
the fuel suction line B. Remove and check the
operation of the valve.
C. Loose connections or damaged
fuel lines between the tank and
fuel pump C. Check for signs of leaking fuel.
Tighten all fittings and
connections. Replace any
damaged hoses or fuel lines.
D. Plugged or defective fuel filter D. Check the fuel pressure with an
engine diagnostic tool. Refer to
the engine manual for this
specification. Change the fuel filter
if necessary. Check the gaskets
and hoses for leaks.
E. Faulty fuel pump E. Check the fuel pump. Refer to
the engine manual
(Manufacturer’s Literature,
Chapter 5).
NOTE: With fuel system
problems, it may be necessary to
bleed air out of the fuel system
after a repair has been performed.
See the engine manual for
bleeding instructions.
F. A faulty connection exists
between the engine controller and
the GCM on the J1939 bus. F. Check the GCM display for the
engine charging voltage. If this
value is 0.0V, check and repair
the J1939 bus connections. Refer
to the electrical schematic.
G. The engine is not receiving the
key switch power signal. G. Ensure that the emergency
stop (S22) is not faulty. Check that
the key switch power relay (K10)
is not faulty.
Property of American Airlines