ENGINE DIAGNOSTIC TEST PROCEDURES
ELECTRIC SHUTOFF (AUTOMATIC SHUT-OFF)
ENGINE WILL CRANK, BUT WILL NOT START
Place transmission in neutral with parking
INOPERABLE AS FOLLOWS: OBSERVE
SHUTOFF LEVER (1, FIGURE 1) AND TURN
IGNITION SWITCH TO "IGNITION" POSITION.
PROCEDURES 1 THRU 8 TO DETERMINE
CAUSE AND REMEDY.
Fuse - Inspect electric shutoff solenoid fuse. If
burned out, replace with a 15 amp fuse. Refer to
Figure 8 for S-Series Wiring diagram and Figure
9 for Cargostar diagram.
12 V Supply - Check for 12 volts between
positive and negative terminals of solenoid with
the 15 amp fuse in place. Turn ignition switch
key to "Ignition" position. Minimum voltage
required for solenoid to pull in is 9 volts.
Do NOT "jump" or bypass the fuse.
Do NOT allow voltmeter negative test lead
to short between the (-) negative and
smaller "AUX" terminal on the solenoid,
if this occurs, fuse or solenoid failure
may result [See Figure 7 for terminal
NOTE: "AUX" terminal is present only on early model
IF VOLTAGE AVAILABLE TO SOLENOID IS
CONDITION, WIRING AND CONNECTIONS,
IGNITION SWITCH AND ELECTRIC SHUTOFF
RELAY (IF APPLICABLE). REPLACE ANY
STAR TYPE LOCKWASHERS FOUND ON
SOLENOID TERMINALS WITH SPLIT TYPE
Rubber Boot - The rubber boot seals the core
from dirt, water, etc.
Verify that boot is firmly attached to
Replace any boot that is torn.
Replace any boot that becomes hard and
inflexible in cold temperatures (-1 0°F or
below) that may hinder "pull in" of the
Solenoid Worn - Inspect as follows:
Inspect for evidence of dust, dirt, brass
power, or blackened deposits in solenoid
Inspect for wear on the inside diameter of
the lower portion of the return spring. This
condition will result in binding of spring coil
on plunger causing slow or no plunger "pull
If evidence of a worn solenoid is found, as
described above, solenoid condition is marginal and
may not "pull in" quickly or consistently.
Measure resistance (ohms) across the positive
and negative terminals of the solenoid as
follows; (refer to Figures 10, 11 and Internal
Turn off power supply to solenoid. Remove
plunger and connect test ohmmeter to (+)
positive and (-) negative terminals.
With plunger removed, 0.2-0.3 ohms
resistance should be observed.
Depress switch button in bottom of solenoid
core (using a clean wooden dowel rod),
read ohmmeter, 18-20 ohms resistance
should be observed.
Printed in United States of America