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 TABLE 6-2. TROUBLESHOOTING
STEP
PROCEDURE
CORRECTIVE ACTION
Electrical
1. Dead truck - Truck a. IMS relay fails to
a. With drive wheels off
completely in-
pick-up.
truck off floor, make
operable.
following checks:
(1) Check fuse 8FU
and replace if
defective.
(2) Remove fuse 8FU
and, with ohm-
meter, check
continuity be-
tween battery
switch, panic
switch, seat
switch, and
relay IMS coil.
Also check
suppressor 4SP
especially
diode between
terminals 4 and
5. Replace
defective
component.
b. IMS relay contacts
b. Clean contacts with
dirty.
crocus cloth or fine
flat file.
c. Defective suppressor
c. Check suppressor 4SP
4SP.
using ohmmeter. Re-
place if defective.
2. Neither forward or a. Fuses 1FU, 2FU, 3FU
a. Replace defective
reverse operation.
or 12FU.
fuse.
b. Directional switch
b. With drive wheels of
circuit.
truck off floor, make
following checks:
(1) Check fuse 6FU.
Replace if
defective.
(2) Check continuity
through No. 2
Circ. FWD & REV
contacts of
switch with ohm-
meter. Replace
directional
switch if de-
fective.
6-5
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