Workshop

HYDRA-MATIC 6L80 (6 Speed)

Fluid Pressure Switches
TRANSMISSION FLUID
TEMPERATURE SENSOR
(THERMISTOR)
CONTROL SOLENOID BODY
AND TCM ASSEMBLY
Figure 8
Figure 9
+
BODY SEAL
DISK PISTON
DIAPHRAGM
UPPER
CONTACT
LOWER
CONTACT
PRESSURE SWITCHTFT SENSOR
Selector
Position
Switch 1
1 = Pressurized Open) 0 = Exhausted (Closed)
1
1
1
1
1
1
1
0
0
0
Switch 3
0
0
0
1
1
1
1
1
0
0
Switch 4
0
0
0
0
0
0
0
0
1
1
Switch 5
0
0
0
0
0
0
0
1
1
1
Park
Pressure Switch Logic
Reverse
Neutral
"D"-1st
"M"-1st
"D"-2nd
"D"-3rd
"D"-4th
"D"-5th
"D"-6th
The transmission fluid pressure switches located in
the control solenoid body and TCM assembly are
normally closed. When closed, these switches allow
current flow through the switch. When fluid pressure
is routed to the switch, pressure moves the diaphragm,
piston and disk such that the circuit opens and there is
no current flow. See Figure 9 for a cut-away view and
a pressure switch logic chart.
TFP switch 1 sends a signal to the TCM to indicate the
state of the 3-5 and reverse clutch Reg. valve.
TFP switch 3 sends a signal to the TCM to indicate the
state of the 2-6 clutch regulator valve.
TFP switch 4 sends a signal to the TCM to indicate the
state of the 1-2-3-4 clutch regulator valve.
TFP switch 5 sends a signal to the TCM to indicate the
state of CBR1/4-5-6 clutch regulator valve.
(CBR1 = Clutch Braking 1st)
The fluid pressure switches are part of the Control
Solenoid Body and TCM Assembly, and are not
serviced seperately.
Continued on next Page
ELECTRONIC COMPONENTS (CONT'D)
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
10
Copyright © 2007 ATSG
Copyright © 2007 ATSG

Leave a Reply

Your email address will not be published. Required fields are marked *