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 TM 9-2815-220-24
INTAKE MANIFOLD HEATER ABNORMAL OPERATION
0023 00
MALFUNCTION 1: (Continued)
Manifold heater inoperative.
Ignition Unit Operation
NOTE
WARNING
Disconnect purge pump fuel hose
High Voltage!
quick-disconnect coupling at engine
(See decal on unit.)
before performing test.
Voltage High Amperage Output.
PROCEDURE
OBSERVATION
ANALYSIS
Note high-tension spark (hot
Remove high-tension wire
High-tension spark indicates
bluish-white) across gap (lead-
from igniter (spark plug).
ignition unit operation
to-ground).
Position lead wire end to
normal.
ground for spark gap
Improper spark or no spark
(1/4 inch)
indicates ignition unit or
ignition unit lead is defective.
Replace unit and lead
Assembly and Related Parts
Replacement).
Spark Plug Operation
WARNING
High Voltage!
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 to
normal.
engine and press manifold
No spark, the spark plug is
heater switch "ON".
defective. Replace spark
plug.
Solenoid Valve(s) Operation
Note audible "click" or opening
Press manifold heater
Evidence of action indicates
and closing valve action (by
switch intermittently "ON"
normal solenoid valve
touch) of both solenoid valves
and "OFF".
operation.
(fuel supply and fuel return).
No audible "click" or action
indicates solenoid valve(s) is
defective.
WP 0023 00-3
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