ATSG AX4S, Update Handbook

Page: 108 / 120

AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
108
Copyright © 2002 ATSG
FORD AX4S/AX4N
VEHICLE SPEED SENSOR CHANGES
CHANGE:
REASON:
PARTS AFFECTED:
INTERCHANGEABILITY:
SERVICE INFORMATION:
The gear driven vehicle speed sensor that has been in use in the AX4S and the AX4N since their
inception will be replaced, as a running change during the 1999 model year beginning with the
AX4S, and at the start of production for the 2000 model year for the AX4N, with a permanent
magnet speed sensor. The PM Generator will be mounted in the barrel of the case and will be using
the park gear teeth as an exciter wheel.
The possibility of the VSS drive or driven gear "apple coring" will be eliminated as well as the
intermittent loss of vehicle speed signal due to the speed sensor sub harness damage that would
occur as a result of exhaust system heat transferral.
(1)
(2)
TRANSAXLE CASE - Changed to accommodate mounting the new design speed sensor so that
it is in line with the planetary support and the park gear.
FINAL DRIVE SUPPORT - Changed to accommodate mounting the new design speed sensor
and now has a
"cut out" for the speed sensor to look through at the park gear, as shown in Figure
94.
The PM Generator type of speed sensor being new to the vehicle line, would prevent them from
being used in any earlier vehicles not designed with this type of system.
The vehicle speed sensor for the AX4S is illustrated in Figure 95 and the vehicle speed sensor for
the AX4N is shown in Figure 96.
AX4S Vehicle Speed Sensor............................................................................ XF2Z-7H103-AA
AX4N Vehicle Speed Sensor............................................................................ YF1Z-7H103-AA
LUS/MLUS