Page 953 of 1691

Removal & Installation (Ram Pickup)
PTO switch is used on models only with after market PTO
units. PTO switch delivers an input signal to Powertrain Control
Module (PCM) to indicate when PTO is engaged. The PCM will disable
certain OBD-II systems when PTO is engaged. No other service
information is available from manufacturer.
THROTTLE POSITION (TP) SENSOR
Removal (Dakota, Durango, Ram Pickup 3.9L, 5.2L & 5.9L, Ram
Van & Ram Wagon)
The TP sensor is located on side of throttle body. On Ram Van
and Ram Wagon, remove engine cover. On all models, remove air inlet
duct at throttle body for access to TP sensor. Disconnect electrical
connector at TP sensor. Remove retaining bolts and TP sensor.
Installation
1) Throttle shaft on throttle body slides into socket on TP
sensor. Throttle shaft rests against tabs in socket on TP sensor. See
Fig. 12 .
2) Install TP sensor on throttle body. When properly
installed, TP sensor should rotate a few degrees so retaining bolts
may be installed. Slight tension should exist on TP sensor when
rotating TP sensor.
3) If difficult to rotate TP sensor into position when
aligning retaining bolts, remove TP sensor. Reinstall TP sensor so
throttle shaft is on the other side of tabs in socket on TP sensor.
Tighten retaining bolts for TP sensor to specification. See TORQUE
SPECIFICATIONS.
4) Operate throttle lever on throttle body to ensure no
binding exists in TP sensor. Install electrical connector and air
inlet duct or air cleaner assembly.
Removal (Ram Pickup 8.0L)
The TP sensor is located on side of throttle body. Remove air
inlet duct at air cleaner assembly. Remove cover from air cleaner
assembly. Remove air cleaner housing-to-throttle body nuts and air
cleaner housing from throttle body. Disconnect electrical connector at
TP sensor. Remove retaining bolts and TP sensor.
Installation
1) Throttle shaft on throttle body slides into socket on TP
sensor. Throttle shaft rests against tabs in socket on TP sensor. See
Fig. 12 .
2) Install TP sensor on throttle body. When properly
installed, TP sensor should rotate a few degrees so retaining bolts
may be installed. Slight tension should exist on TP sensor when
rotating TP sensor.
3) If difficult to rotate TP sensor into position when
aligning retaining bolts, remove TP sensor. Reinstall TP sensor so
throttle shaft is on the other side of tabs in socket on TP sensor.
Tighten retaining bolts for TP sensor to specification. See TORQUE
SPECIFICATIONS.
4) Operate throttle lever on throttle body to ensure no
binding exists in TP sensor. To install remaining components, reverse
removal procedure. Tighten air cleaner housing-to-throttle body nuts
to specification. See TORQUE SPECIFICATIONS.
Page 954 of 1691
Fig. 12: Installing Typical TP Sensor
Courtesy of Chrysler Corp.
TRANSMISSION GOVERNOR PRESSURE SENSOR
Removal & Installation (A/T Models)
Transmission governor pressure sensor is located in governor
body on transmission valve body. See appropriate ELECTRONIC CONTROLS
article in AUTOMATIC TRANSMISSIONS section.
TRANSMISSION OVERDRIVE SWITCH
NOTE: Transmission overdrive switch may also be referred to as
overdrive/override switch, OD switch or overdrive off
switch.
Removal & Installation (A/T Models)
Transmission overdrive switch is located on end of gear shift
lever. Service information is not available from manufacturer.
TRANSMISSION SPEED SENSOR
Removal & Installation (A/T Models)
Transmission speed sensor may also be referred to as output
shaft speed sensor. See OUTPUT SHAFT SPEED SENSOR under ENGINE SENSORS
& SWITCHES.
Page 955 of 1691

TRANSMISSION TEMPERATURE SENSOR
Removal & Installation (A/T Models)
Transmission temperature sensor is located on transmission
valve body, incorporated into governor pressure sensor. See
appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS
section.
UPSTREAM OXYGEN SENSOR
NOTE: Upstream oxygen sensor may also be referred to as pre
-catalyst oxygen sensor.
Removal
Upstream oxygen sensor is mounted on exhaust pipe, in front
of catalytic converter. Raise and support vehicle. Disconnect
electrical connector for upstream oxygen sensor. Using Socket
(YA8875), remove upstream oxygen sensor from exhaust pipe.
Installation
1) If installing original or used upstream oxygen sensor,
apply anti-seize compound on threads of upstream oxygen sensor. A NEW
upstream oxygen sensor should already be coated with anti-seize
compound.
2) Install and tighten upstream oxygen sensor to
specification. See TORQUE SPECIFICATIONS. Install electrical
connector.
MOTORS, RELAYS & SOLENOIDS
IDLE AIR CONTROL (IAC) MOTOR
Removal & Installation (Dakota, Durango, Ram Pickup 3.9L,
5.2L & 5.9L, Ram Van & Ram Wagon)
1) IAC motor is located on throttle body and contains a 4-pin
electrical connector. On Ram Van and Ram Wagon, remove engine cover.
2) On all models, remove air inlet duct or air cleaner
assembly for access to IAC motor. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor from throttle body.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts to specification. See TORQUE SPECIFICATIONS.
Removal & Installation (Ram Pickup 8.0L)
1) IAC motor is located at rear of throttle body and contains
a 4-pin electrical connector. Remove air inlet duct at air cleaner
assembly. Remove cover from air cleaner assembly.
2) Remove air cleaner housing-to-throttle body nuts and air
cleaner housing from throttle body. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts and air cleaner housing-to-throttle body nuts to
specification. See TORQUE SPECIFICATIONS.
A/C RELAY, AUTO SHUTDOWN (ASD) RELAY & FUEL PUMP RELAY
NOTE: A/C relay may also be referred to as A/C clutch relay or A/C
compressor clutch relay.
Removal & Installation
Relays are located in Power Distribution Center (PDC). Relays\
may be identified by label on inside of PDC cover. See POWER
DISTRIBUTION CENTER (PDC) LOCATION table.
Page 956 of 1691