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 TM 9-2815-220-24
ENGINE FAILS TO CRANK
0006 00
MALFUNCTION 1: (Continued)
Engine will not crank (no response when starter switch is pressed).
PROCEDURE
OBSERVATION
ANALYSIS
(Continued) Master
Indicator needle at extreme left position.
Batteries dead. Cables
switch "ON".
disconnected or
corroded.
PROBABLE CAUSE
CORRECTIVE ACTION
d. (Continued) Low voltage protection module (4)
Check for loose, broken or corroded cables
operating and/or batteries discharged (below
and terminals. Repair or replace as needed.
12 volts).
Refer to pertinent vehicle technical manual.
(5)
Recharge/replace batteries or slave-start
engine. If starter cranks and engine starts,
go to step e.
(6) If starter still fails to crank, starter is faulty
and must be replaced (WP 0049, Starter
Motor Replacement) or engine is seized
(Malfunction 2, this work package).
e. Generator defective.
(1) Check generator as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Start and operate
Indicator needle in "green" area.
Generator charging normal.
engine at 1000-1200
Indicator needle just entering
Generator not charging
rpm.
"yellow" area.
properly or voltage regulator
faulty.
Indicator needle in "yellow" area
Generator charging slowly
(below normal).
Batteries discharging (possible
Indicator needle in left side of
reversed cable connection).
"red" area.
Indicator needle in right side of
Generator overcharging and
"red" area.
voltage regulator is
malfunctioning.
PROBABLE CAUSE
CORRECTIVE ACTION
f. Electrical starting circuit defective.
(1) Check circuits, switches and connectors.
Refer to pertinent vehicle technical manual.
(2) Replace starter low voltage protective
module (WP 0050, Low Voltage Starter
Protection Module Replacement).
WP 0006 00-2
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