Service Procedures - Chrysler 1991 Service Manual Supplement

• FUEL SYSTEM 14 - 21
S E R V I C E P R O C E D U R E S
INDEX
page
Fuel Injection Pump 22
Injection Timing 26
THROTTLE POSITION SENSOR
The throttle position sensor is adjustable. The sen-
sor must be adjusted after installation.
REMOVAL
(1) Remove the TPS connector (Fig. 1).
(2) Remove the TPS mounting screws. Lift the sen-
sor straight up to remove it.
Fig. 1 Throttle Position Sensor
INSTALLATION
The bottom of the throttle position sensor has a
hex head. It fits into a hex opening in the injection
pump throttle shaft (Fig. 2).
Fig. 2 Throttle Position Sensor Installation
page
KSB Solenoid
22
Throttle Position Sensor . . . . . . . . . . . . . . . . . . . 21
(1) Install the TPS to the bracket. The hex drive on
the bottom of the TPS shaft may not align with the
opening in the throttle shaft. I f not, remove the
bracket mounting screws and place the hex drive of
the TPS into the socket of the throttle lever. Position
the hex drive so the TPS bracket has to be rotated
clockwise to align the mounting holes.
The hex drive of the TPS should be flush with the
top of the throttle lever hex socket or just above it.
To adjust the hex head position, hold the nylon shaft
in place with an open end wrench while adjusting
the hex head position.
(2) I f the bracket mounting screws were removed,
tighten them to 7 N*m (60 in. lbs.) torque. Tighten
the TPS mounting screws.
(3) Connect the electrical connector to the TPS.
v (4) Adjust the throttle position sensor. Refer to Ad-
justment procedure.
ADJUSTMENT
CAUTION: Before adjusting the throttle position
sensor, the throttle linkage must be checked for
correct adjustment. The throttle lever must contact
the low idle speed screw. The throttle lever must
reach breakover when the throttle is wide open. Re-
fer to the Accelerator Pedal and Throttle Cable sec-
tion of Group 14, Fuel Systems, in the 1991 Rear
Wheel Drive Truck Service Manual.
A digital voltmeter or the DRB I I tool is needed to
adjust the throttle position sensor.
(1) Connect the negative probe of the voltmeter to
a good ground source such as the negative post of the
battery.
(2) Backprobe the throttle position sensor output
wire at the TPS electrical connector.
(3) With the fuel injection pump throttle lever con-
tacting the low idle speed screw (Fig. 3), the TPS
output should be 1 volt or slightly above. I f not, use
an open end wrench to adjust the TPS sensor shaft
until the correct voltage is obtained. The TPS sensor
shaft is machined to accept an open end wrench (Fig.
4).
* (4) I f the output voltage is not within the correct
range, adjust the sensor until the correct voltage is
obtained.