Dodge ram truck 3500 1996 Service Manual page 1362

REUOWAL AND INSTALLATION (Continued!
IS OUTPUT WIRE B O U 5 J9414-91
Fig. 34 Throttle Position Sensor—Diesel
(3) Connect the electrical connector on bottom of
TPS.
(4) Operate the throttle by hand to check for bind­
ing.
(5) The TPS voltage must now be tested and (if
necessary) adjusted. Refer to the following: Throttle
Position Sensor Testing.
THROTTLE POSITION SENSOR TESTING
CAUTION: Before attempting to test the TPS, verify
the linkage adjustment dimension (Fig. 35). This
dimension MUST be 126.5 mm (5.0 inches) BEFORE
testing. For linkage adjustment procedures, refer to
Throttle Linkage Adjustment—Diesel Engine. This
can be found in the Accelerator Pedal and Throttle
Cable section of this group.
CAUTION: Before testing the TPS, verify that the
engine is set at correct low idle speed. Refer to Idle
Speed Adjustment.
(1) After confirming the correct linkage adjustment
and idle speed, proceed to the following:
(2) Attach a paper clip into the center terminal
(Fig. 34) of the TPS electrical connector. Do not
remove the connector from the TPS for this test.
(3) Attach the positive lead of a voltmeter to this
paper clip and the negative lead to a good ground.
(4) Turn the ignition switch to the ON position. Do
not start engine.
(5) The voltage at the TPS center terminal should
be 1.0 volt (± .2 volt) with linkage at idle position. At
CENTER REAR FACE
OF BALL OF BRACKET J9414-68
Fig. 35 Linkage Measurement—Diesel
wide open throttle (WOT), the output voltage must
be 2.2-to-2.9 volts higher than at idle speed. I f volt­
age is not correct, proceed to adjusting linkage.
(6) The linkage rod (Fig. 36) connecting the throt­
tle lever to the fuel injection pump lever is adjust­
able. To prevent damage to the ends of linkage,
attach locking-type pliers to the flat (Fig. 36) located
on the linkage rod before loosening locknuts.
(7) Loosen the right-hand-threaded nut (Fig. 36).
(8) Loosen the left-hand-threaded nut (Fig. 36).
(9) Slowly rotate the flat (Fig. 36) on the linkage
rod (lengthen or shorten) to achieve 1.0 volt (± .2
volts) on the voltmeter with the linkage in the idle
position. At wide open throttle (WOT), the output
voltage must be 2.2-to-2.9 volts higher than at idle
speed. DO NOT lengthen or shorten the linkage
r o d more t h a n 1 m m from the dimension shown
i n (Fig. 35). I f voltage requirements cannot be
met by linkage adjustment (125.6 to 127.6 mm),
replace the TPS.
(10) Tighten both nuts after adjustment.
(11) With the engine OFF, operate the throttle
from accelerator pedal and check for throttle lever
action and binding. Be sure throttle lever stop is
against the low idle speed screw after throttle is
released.