Workshop

HYDRA-MATIC 6L80 (6 Speed)

SLIDING
ACTUATOR
ELECTRICAL
CONNECTOR
TRANSMISSION MANUAL SHIFT
POSITION SWITCH ASSEMBLY
(INTERNAL MODE SWITCH)
ELECTRONIC COMPONENTS (CONT'D)
TRANSMISSION MANUAL SHIFT
POSITION SWITCH ASSEMBLY
The Transmission Manual Shift Position Switch
Assembly, sometimes referred to as Internal Mode
Switch (IMS), is a sliding contact switch that
connects to the manual valve, with a connector that
plugs into the control solenoid body and TCM
assembly, and is shown in Figure 16.
There are four inputs to the TCM from the position
switch assembly, that indicate which transmission
gear range has been selected. The state of each input
is available for display on the scan tool. The four
input parameters represented are Signal A, Signal B,
Signal C, and Signal P (Parity).
A fifth input signal "N" (P/N Start), does not input to
the TCM, but goes directly to the ECM to determine a
Park/Neutral state and allow the engine to be started.
Routing Signal N to the ECM will allow the engine to
be started, even with a dead TCM. Signal N is not a
signal used by the TCM for manual shift selector
position logic. A logic chart has been provided for
you in Figure 15, and a partial wire schematic in
Figure 17.
The Transmission Manual Shift Position Switch
assembly is serviced seperately.
If the TCM detects an improper signal from the
transmission manual shift position switch (IMS)
assembly, a DTC will be activated.
Gear Selector
Position
Signal A
LOW
LOW
LOW
HI
HI
HI
HI
Internal Mode Switch Terminal Identification
LOW
LOW
LOW
LOW
HI
HI
HI
HI
HI = Ignition Voltage
LOW
LOW = 0 Volts
LOW
LOW
HI
HI
LOW
LOW
HI
HI
LOW
LOW
HI
HI
LOW
HI
LOW
HI
HI
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HI
HI
HI
HI
HI
HI
LOW
HI
HI
HI
HI
HI
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HI
HI
LOW
Signal B Signal C Signal P
Park
Park/Reverse
Reverse
Reverse/Neutral
Neutral
Neutral/Drive 6
Drive 6
Terminal
A
B
C
D
E
F
Function
Park/Neutral Sart Signal "N" (Direct to ECM)
Mode Switch Switch Signal "A"
Mode Switch Switch Signal "B"
Mode Switch Switch Signal "C"
Mode Switch Switch Signal "P"
Ignition Switch Voltage Feed
Drive 6/Drive 4
Drive 4
Drive 4/Drive 3
Drive 3
Drive 3/Drive 2
Drive 2
Open
Invalid
Invalid
INTERNAL MODE SWITCH LOGIC
Figure 15
Figure 16
A B C D E F
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
15
Copyright © 2007 ATSG
Copyright © 2007 ATSG

Leave a Reply

Your email address will not be published.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