Repair Manual

11
Copyright © 2010 ATSG
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
Figure 11
Solenoid Feed
Blocked
Solenoid Feed
Open
Pressure Out
To Control Valves
Blocked
Pressure Out
To Control Valves
Open
Exhaust
Open
Exhaust
Blocked
Solenoid "OFF"
(De-Energized)
Solenoid "ON"
(Energized)
10 - 16 Ohms
Resistance
On/Off Solenoids (N88), (N89)
ELECTRONIC COMPONENTS (CONT'D)
SOLENOID OPERATION
These solenoids both operate in exactly the same
manner, as shown in Figure 11, based on commands
from the TCM. Both of the On/Off solenoids are
"Normally Closed".
These two solenoids operate in conjunction with the
Pulse Width Modulated (PWM) solenoids to provide
the proper gear ratio for the current road conditions.
Refer to Figure 11 for operational checks. Check
these solenoids for proper resistance with the positive
lead of Ohm Meter to the terminal and the negative
lead to the case of the solenoid. When comparing
On/Off solenoids, resistance should be within .5
Ohms of one another.
ON/OFF SOLENOIDS (N88), (N89),
PWM Solenoid (N91)
PWM Solenoids (N90), (N92),
(N93), (N282), (N283)
PWM Solenoid (N91) operates exactly the opposite
of the other PWM solenoids, in that it is "Normally
Vented", as shown in Figure 12.
Notice that the solenoid feed oil is fed through a
.032" orifice, down the side of the solenoid and back
through a passage to either TCC feed or to exhaust,
depending on whether the solenoid is On or Off, as
shown in Figure 12. Check these solenoids for proper
resistance with the leads of the Ohm Meter across the
terminals. When comparing PWM solenoids,
resistance should be within .5 Ohms of one another.
PWM Solenoids (N90), (N92), (N93), (N282), and
(N283) operate exactly the opposite of the (N91)
PWM solenoid, as they are "Normally Applied", as
shown in Figure 13.
Notice that the solenoid feed oil is fed through a
.032" orifice, down the side of the solenoid and back
through a passage to solenoids assigned component or
to exhaust, depending on whether the solenoid is On
or Off, as shown in Figure 13. Check these solenoids
for proper resistance with the leads of the Ohm Meter
across the terminals.
Refer to Figure 10 for the component assigned to
each of these PWM solenoids. When comparing
PWM solenoids, resistance should be within .5 Ohms
of one another.
Note: Refer to Figure 14 for Solenoid Application
chart and Clutch Application chart for each gear.
You will also find an observed Amperage chart from
the actual vehicle that you can use for comparison.
This should make the diagnosis process much easier
for the vehicle that you are repairing.
Electronic Components
Continued on Page 14
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