4 X 2 Gear Selector
30
6.6. After power passes through the brake switch, it
reaches the gear selector button on the dash-
board. If power reaches these buttons, the
brake switch contacts are closed.
See Figure 6.6.
6.7. If the gear selector only works properly only
in one direction, the shift signal may not be
reaching the ESM from the gear selector button
on the dashboard.
6.8. With the key switch on, check the red wire that
connects to the back of each gear selector but-
ton to insure that it is getting power.
6.9. Press each button and check for power at the
downstream spade terminal on the back of the
button to confirm that the contacts are closing,
and it is passing the shift signal back to the
ESM. See Figure 6.9.
6.10. The vacuum tests may identify a vacuum sole-
noid that is not working properly. Check the
power to the solenoids to confirm whether the
problem is in the solenoid itself or in the electri-
cal signal to the solenoid.
NOTE: The orange with white trace wire that
leads to each vacuum solenoid is “hot”
whenever the key switch is in the on position.
The ESM energizes the vacuum solenoids by
creating a ground path through the second wire.
6.11. Check the orange with white trace wire for power
at each vacuum solenoid with the key switch in
the on position. See Figure 6.11.
6.12. If there is no power, but the ESM has been con-
firmed to have power, check for power at the
ESM end of the wire. If power is present at the
ESM end of the wire, the problem lies in the har-
ness between the ESM and the vacuum sole-
noid. If power is absent, the ESM may be at
fault.
6.13. Check the second wire on each vacuum sole-
noid (yellow with black trace for forward sole-
noid, orange for reverse solenoid) for power
when the corresponding gear is selected.
Figure 6.6
Checking for power at
gear selector buttons
Figure 6.9
Key switch “ON”
“Forward” button depressed
Voltage present
Figure 6.11
Testing for power to
the solenoid
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