Copyright © 1996 General Motors Corp. 3–25
PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
Table 3–13. Troubleshooting Chart
Problem Probable Causes Suggested Remedies
A. Abnormal Automatic Shifts
Shifts occurring at too high speed Governor valve malfunctioning
(stuck).
Clean or replace governor screen
and/or governor. The governor may
be disassembled for cleaning and
inspection only if the kit consisting
of two governor weight pins and
cover gasket is available. Refer to
Paragraphs 5–3e, 5–3h(5), 6–5,
7–10a, and 7–11a.
Vacuum modulator vacuum hose to
engine kinked or leaking — light
throttle shifting delayed.
Replace hose. Be sure vacuum line
is free from kinks or bends and not
close to exhaust components.
Vacuum modulation delayed. Replace vacuum modulator. Be sure
that O-ring is installed and that the
modulator vacuum fitting is facing
forward and positioned 10° below
horizontal. Refer to Paragraphs 5–3c
and 7–11b.
Mechanical actuator cable kinked,
broken, or not properly adjusted.
Replace, adjust, or repair cable. Full
actuator control cable travel must
correspond with full throttle (push or
pull system). Refer to the latest edi-
tion of SA1321, AT Mechanic’s
Tips.
Mechanical actuator malfunctioning. Replace actuator.
Shift signal valve adjustment too
high.
Adjust shift points. Refer to Para-
graph 3–13.
Valves sticking. Replace or rebuild main control
valve assembly. Refer to Paragraph
6–6.
Improper modulation. Inspect and replace, if necessary,
modulator valve and modulator
body. Refer to Paragraphs 6–6a(5)
and 6–6b(16).
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