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 TM 9-2815-220-24
INTAKE MANIFOLD HEATER ABNORMAL OPERATION
0023 00
MALFUNCTION 1: (Continued)
Manifold heater inoperative.
Manifold heater Voltage Checks
NOTE
Disconnect purge pump fuel hose quick-disconnect coupling at engine
before performing test.
PROCEDURE
OBSERVATION
ANALYSIS
Check electrical circuit
24 volts at manifold heater
Proper voltage through
voltages (master switch and
switch, both connectors.
manifold heater switch.
manifold heater switch
No voltage to switch.
Defective circuit. See
"ON").
appropriate vehicle technical
manual.
No voltage from switch.
Defective switch.
24 volts at engine bulkhead
Proper voltage.
connector.
No voltage to bulkhead
Defective circuit between
connector.
switch and connector. See
appropriate vehicle technical
manual.
Proper voltage to solenoid
24 volts at solenoid valve(s)
valves.
supply and return wire
connector.
No voltage at solenoid valves.
Defective circuit between
connector and valves. See
appropriate vehicle technical
manual.
24 volts at ignition unit
Proper voltage supply to
connector.
ignition unit.
No voltage at ignition unit.
Defective circuit to ignition
unit. See appropriate vehicle
technical manual.
WP 0023 00-2
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