ATSG FORD 4R100 Manual page 10

ELECTRICAL COMPONENT DIAGNOSIS
Digital Transmission Range Sensor
The Digital Transmission Range (DTR) sensor has a
twelve pin electrical connector and is located on the
outside of the transmission at the manual lever, as
shown in Figure 12.
The DTR sensor completes the start circuit in Park
and Neutral, the backup lamp circuit in Reverse, and
the neutral sense circuit (4WD Only) when in Neutral.
The DTR sensor also opens or closes a set of four
different switches that are monitored by the
Powertrain Control Module (PCM) to determine the
position of the transmission manual lever. Refer to
Figure 13.
10
Technical Service Information
F or d F or d
-7 00 6- BA
RF F8 1P
98
Copyright © 2003 ATSG
Figure 12
AUTOMATIC TRANSMISSION SERVICE GROUP
DTR TESTING PROCEDURE
In Figure 13 we have provided you with pin number
identification for both the transmission range sensor
and the vehicle harness. We have also provided a
chart that will give you the open/closed state of each
internal switch, dependent on selector position, and
notice that three positions read a 270W resistor, that is
also internal.
Note: All testing that we have provided for you is
done with a DVOM, set to the ohms position, and all
tests are performed with the ignition switch in the
"OFF" position.
(1) Testing the transmission range 3A switch, and
the 270W internal resistor is done across pins 2
and 3 of the DTR sensor, and must be checked in
each selector position to determine the switch
and resistor integrity. Refer to Figure 13.
(2) Testing the transmission range 1 switch is done
across pins 2 and 4 of the DTR sensor, and must
be checked in each selector position to
determine switch integrity. Refer to Figure 13.
(3) Testing the transmission range 2 switch is done
across pins 2 and 5 of the DTR sensor, and must
be checked in each selector position to
determine switch integrity. Refer to Figure 13.
(4)
Testing the transmission range 4 switch is done
across pins 2 and 6 of the DTR sensor, and must
be checked in each selector position to
determine switch integrity. Refer to Figure 13.
(5) Testing the reverse lamp circuit is done across
pins 9 and 11 of the DTR sensor, and must be
checked in each selector position to determine
switch integrity. Refer to Figure 13.
(6)
Testing the neutral start circuit is done across
pins 10 and 12 of the DTR sensor, and must be
checked in each selector position to determine
switch integrity. Refer to Figure 13.