Dodge RAM TRUCK 1500 1995 Service Manual page 1228

Fig. 61 Linkage Measurement—Diesel
CAUTION: Before testing the T P S , verify that the
engine is set at correct low idle speed. Refer to Idle
Speed Adjustment. This can be found in the Diesel
Engine—General Diagnosis section of this group.
(1) After confirming the correct linkage adjustment
and idle speed, proceed to the following:
(2) Attach a paper clip into the center terminal
(Fig. 60) of the TPS electrical connector. Do not re­
move 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
wide open throttle (WOT), the output voltage must
be 2.2-to-2.9 volts higher than at idle speed. If volt­
age is not correct, proceed to adjusting linkage.
(6) The linkage rod (Fig. 62) 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. 62) located
on the linkage rod before loosening locknuts.
(7) Loosen the right-hand-threaded nut (Fig. 62).
(8) Loosen the left-hand-threaded nut (Fig. 62).
(9) Slowly rotate the flat (Fig. 62) on the linkage
rod (lengthen or shorten) to achieve 1.0 volt (± .2
Fig. 62 Throttle Lever Linkage Adjustment—Diesel
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
rod more than 1 mm from the dimension shown
in figure 61. If 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 re­
leased.
(12) Be sure of wide open throttle (WOT) when ac­
celerator pedal is pressed to the floor. This is checked
by observing throttle lever breakover position. Pro­
ceed to the following:
(a) Key OFF and engine OFF for this test.
(b) Two people are needed for this test. From in­
side of the vehicle, press the accelerator pedal
about half-way to the floor. Movement of both the
throttle lever and throttle lever-to-inj ection pump
lever linkage rod (Fig. 62) should be observed.
(c) Continue to press the accelerator pedal to the
floor. If throttle lever breakover is operating cor­
rectly, the throttle lever-to-inj ection pump lever