Dodge dakota 2002 Service Manual page 1315

9 - 66 ENGINE - 3.7L
OIL PAN (Continued)
INSPECTION
(1) Inspect oil drain plug and plug hole for
stripped or damaged threads. Repair as necessary.
(2) Inspect the oil pan mounting flange for bends
or distortion. Straighten flange, if necessary.
INSTALLATION
(1) Clean the oil pan gasket mating surface of the
bedplate and oil pan.
(2) Inspect integrated oil pan gasket, and replace
as necessary.
(3) Position the integrated oil pan gasket/windage
tray assembly.
(4) Install the oil pickup tube
(5) Install the mounting bolt and nuts. Tighten
nuts to 28 N·m (20 ft. lbs.).
(6) Position the oil pan and install the mounting
bolts. Tighten the mounting bolts to 15 N·m (11 ft.
lbs.) in the sequence shown (Fig. 75).
(7) Lower the engine into mounts using special
tool # 8534.
(8) Install both the left and right side engine
mount through bolts. Tighten the nuts to 68 N·m (50
ft. lbs.).
(9) Remove special tool # 8534.
(10) Install structural dust cover, if equipped.
(11) Install the front crossmember(Refer to 13 -
FRAME & BUMPERS/FRAME/FRONT
MEMBER - INSTALLATION).
(12) Fill engine oil.
(13) Reconnect the negative battery cable.
(14) Start engine and check for leaks.
OIL PRESSURE SENSOR/
SWITCH
DESCRIPTION
The 3–wire, solid-state engine oil pressure sensor
(sending unit) is located in an engine oil pressure
gallery.
OPERATION
The oil pressure sensor uses three circuits. They
are:
Fig. 75 Oil Pan Mounting Bolt Sequence
• A 5–volt power supply from the Powertrain Con-
trol Module (PCM)
• A sensor ground through the PCM's sensor
return
CROSS- • A signal to the PCM relating to engine oil pres-
sure
The oil pressure sensor has a 3–wire electrical
function very much like the Manifold Absolute Pres-
sure (MAP) sensor. Meaning different pressures
relate to different output voltages.
A 5–volt supply is sent to the sensor from the PCM
to power up the sensor. The sensor returns a voltage
signal back to the PCM relating to engine oil pres-
sure. This signal is then transferred (bussed) to the
instrument panel on either a CCD or PCI bus circuit
(depending on vehicle line) to operate the oil pressure
gauge and the check gauges lamp. Ground for the
sensor is provided by the PCM through a low-noise
sensor return.
DR