Quantcast MALFUNCTION 1: Cylinders not firing (insufficient fuel or incomplete combustion) (Continued) - TM-9-2815-220-240104

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TM 9-2815-220-24
ENGINE FAILS TO START AT NORMAL CRANKING SPEED
0008 00
MALFUNCTION 1: (Continued)
Cylinders not firing (insufficient fuel or incomplete combustion).
PROCEDURE
OBSERVATION
ANALYSIS
24 volts at heater switch, both
Proper voltage through heater
(Heater Voltage
connectors.
switch.
Checks, Continued)
Check electrical circuit
No voltage to switch.
Defective circuit.
voltages (master switch
and heater switch
No voltage from switch.
Defective switch.
"ON").
24 volts at engine bulk head
Proper voltage.
connector.
No voltage to bulkhead connector.
Defective circuit between
switch and connector.
24 volts at solenoid valve(s) supply
Proper voltage supply to
and return wire connector.
solenoid valves.
No voltage at solenoid valves.
Defective circuit between
connector and valves.
24 volts at ignition unit connector.
Proper voltage to ignition unit.
No voltage at ignition unit.
Defective circuit to ignition
unit.
Ignition Unit Operational Check
NOTE
WARNING
Disconnect purge pump fuel hose
High Voltage/High Amperage
quick-disconnect coupling at engine
(see decal on unit)
before performing test.
Note high-tension spark (hot
Remove high-tension
High-tension spark indicates
wire from igniter (spark  bluish-white) across gap (lead-to-
ignition unit operation normal.
ground).
plug). Position lead
wire end to ground for
Improper spark or no spark
spark gap (1/4 inch).
indicates ignition unit or lead is
defective
Spark Plug Operational Check
NOTE
WARNING
Disconnect purge pump fuel hose
High Voltage.
quick-disconnect coupling at engine
before performing test.
Note high tension spark across
Remove spark plug,
High tension spark indicates
spark plug electrodes.
reconnect wire to spark
spark plug firing, operation
plug, ground plug body
normal.
to engine and press
No spark indicates the spark
heater switch "ON".
plug is defective.
WP 0008 00-2

 


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