4 X 2 Gear Selector
25
NOTE:
The vacuum reaction is different from
one side of the reservoir to the other because
there is a check valve built into the reservoir.
The reservoir also acts as a damper, smoothing
out the vacuum levels variations and pulses.
NOTE:
If the lines are reversed on the reservoir,
no vacuum will register on the gauge.
NOTE:
If vacuum bleeds down quickly, there are
leaks in the system. Isolate different portions of
the system to identify leaks.
5.11. Dead-head the vacuum gauge to the outlet side
of the reservoir. If the vacuum level falls quickly,
the reservoir is leaking. See Figure 5.11.
Figure 5.11
Dead-head gauge
connection
Viscus from
intake manifold
5.12. Disconnect and plug the fittings that lead to two
of the solenoid valves. If the vacuum bleeds
down quickly, the solenoid valve that is still con-
nected is at fault. Reverse the test to confirm
the results. See Figure 5.12.
5.13. If vacuum bleeds down with all of the solenoid
valves eliminated from the system, and the res-
ervoir is not leaking: the leak lies in the line
between the valves and the accumulator.
5.14. If vacuum reaches the solenoid valves, but the
gear selector does not respond to the push but-
ton on the dashboard, check the action of the
solenoid valves.
5.15. Identify the vacuum line from the forward sole-
noid valve. Use a T-fitting to install the vacuum
gauge in-line between the solenoid and the shift
actuator (upper fitting). See Figure 5.15.
Figure 5.12
Gauge connection
Vacuum line to reservoir
Forward Reverse Differential
solenoid solenoid lock solenoid
Figure 5.15
Vacuum gauge teed-into the vacuum
line from the forward solenoid to the
shift actuator
Summary of Contents for BIG COUNTRY 4X2
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