2005 CHRYSLER CARAVAN change key battery

relay service schedule water pump brake fluid key set clock

Page 302 of 2339

CHRYSLER CARAVAN 2005 Service Manual (1) Turn wheels to the left.
(2) Disconnect the negative battery cable.
(3) Raise vehicle and support.
(4) Remove the left front wheel well splash shield
(Fig. 13).
(5) Unlock and disconnect the elect

Page 418 of 2339

CHRYSLER CARAVAN 2005 Service Manual ²RETRAIN TIRE SENSORS?- This program-
mable feature only applies to vehicles equipped with
the optional Tire Pressure Monitoring System. The
options include Yes and No. The default is No. When
Yes is

²RETRAIN TIRE SENSORS?- This program-
mable feature only applies to vehicles equipped with
the optional Tire Pressure Monitoring System. The
options include Yes and No. The default is No. When
Yes is selected, and the menu button is depressed the
EVIC will enter the training mode, starting with the
left front tire.
²USE FACTORY SETTINGS?- The options
include Yes and No. The default is Yes. When yes is
selected all the programmable features will return to
there defaults and the rest of the programmable fea-
tures will not be displayed. If No is selected the rest
of the programmable features will be displayed at
there current chosen values. This feature will auto-
matically return to the Yes default under two condi-
tions. First, if no programmable features are changed
from there defaults. Second, if all the programmable
features equal there defaults.
²AUTO DOOR LOCKS?- The options include
Yes and No. The default is Yes. When Yes is selected,
all doors and the liftgate lock automatically when
vehicle speed reaches 25 kilometers-per-hour (15
miles-per-hour). If YES is selected, a second program-
mable feature appears,AUTO UNLOCK ON EXIT?
- The options again include Yes and No. The default
is No. When Yes is selected, following each Auto Door
Lock event all doors and the liftgate will automati-
cally unlock when the driver door is opened, if the
vehicle is stopped and the transmission gear selector
is in Park or Neutral. The Auto Door Unlock event
will only occur once following each Auto Door Lock
event.
²REMOTE UNLOCK- The options include
Driver Door 1st and All Doors. The default is Driver
Door 1st. When Diver Door 1st is selected, only the
driver door unlocks when the Unlock button of the
Remote Keyless Entry (RKE) transmitter is
depressed once. The Unlock button of the RKE trans-
mitter must be depressed twice to unlock all doors.
When All Doors is selected, all doors unlock when the
Unlock button of the RKE transmitter is depressed
once.
²REMOTE LINKED TO MEMORY?- This pro-
grammable feature only applies to vehicles equipped
with the optional memory / heated system. The
options include Yes and No. The default is No. When
Yes is selected, the memory system will recall the
Driver 1 or Driver 2 memory settings assigned to the
RKE transmitter being used to unlock the vehicle.
When No is selected, the memory system will only
recall memory settings when the Driver 1 or Driver 2
push buttons of the memory switch on the driver side
front door trim panel are depressed.
²SOUND HORN ON LOCK?- The options
include Yes and No. The default is No. When Yes is
selected, a short horn chirp will provide an audibleconfirmation when the RKE receiver recognizes a
valid Lock signal from an RKE transmitter. When No
is selected, no horn chirp will occur with the RKE
Lock event. This feature may be selected indepen-
dent of theFLASH LIGHTS WITH LOCKS?pro-
grammable feature.
²FLASH LIGHTS WITH LOCKS?- The options
include Yes and No. The default is Yes. When Yes is
selected, a single flash of the hazard warning lamps
will provide an optical confirmation when the RKE
receiver recognizes a valid Lock signal from an RKE
transmitter, and two flashes of the same lamps will
occur when the RKE receiver recognizes a valid
Unlock signal from an RKE transmitter. When No is
selected, no lamp flash will occur with the RKE Lock
or Unlock event. This feature may be selected inde-
pendent of theSOUND HORN ON LOCK?pro-
grammable feature.
²HEADLAMP DELAY =- The options include
Off, 30 Sec, 60 Sec, and 90 Sec. The default is 90 Sec.
When a time interval is selected, the headlamps will
remain on for that length of time when the head-
lamps are turned off after the ignition is turned off,
or if the Auto mode is selected on vehicles with the
Auto Headlamps option. When Off is selected, the
headlamp delay feature is disabled.
²HEADLAMPS ON WITH WIPERS?- This pro-
grammable feature only applies to vehicles equipped
with the optional Auto Headlamps. The options
include Yes and No. The default is No. When Yes is
selected, the headlamps will turn on automatically
when the windshield wipers are turned on. The head-
lamps will turn off when the wipers are turned off,
as long as the headlamp switch is in the Auto or Off
positions. When No is selected, the headlamps will
only turn on if manually selected or if the Auto mode
is selected and the outside ambient light levels dic-
tate that they should be on.
²POWER ACCESSORY DELAY?- The options
include Yes and No. The default is Yes. When No is
selected, the accessory powered components will turn
off automatically when the ignition key is turned off.
When Yes is selected, the accessory powered compo-
nents will remain on for 45 seconds when the igni-
tion key is turned off.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove overhead console. (Refer to 8 - ELEC-
TRICAL/OVERHEAD CONSOLE - REMOVAL).
(3) Remove the ten screws holding the Electronic
Vehicle Information Center (EVIC) module in the
overhead console.
(4) Remove EVIC module from console assembly.
RSOVERHEAD CONSOLE8M-9
ELECTRONIC VEHICLE INFO CENTER (Continued)

Page 444 of 2339

CHRYSLER CARAVAN 2005 Service Manual a second time. Pressing the Panic button also acti-
vates the courtesy lamps. Pressing the Panic button
again stops the exterior lamps from flashing and the
horn from sounding. However, the courtesy l

a second time. Pressing the Panic button also acti-
vates the courtesy lamps. Pressing the Panic button
again stops the exterior lamps from flashing and the
horn from sounding. However, the courtesy lamps
will remain illuminated until either the BCM times
out lamp operation or until the turning of the igni-
tion. The panic feature will operate if the ignition is
ON, but only if the Panic button is pressed prior to
starting the vehicle. A vehicle speed of about 25.7
km/h (15 miles-per-hour) will also cancel the panic
event.
The RKE system can also perform other functions
on this vehicle. If the vehicle is equipped with the
optional Vehicle Theft Security System (VTSS), the
RKE transmitter will arm the VTSS when the Lock
button is depressed, and disarm the VTSS when the
Unlock button is depressed.
The RKE system includes two transmitters when
the vehicle is shipped from the factory, but the sys-
tem can retain the vehicle access codes of up to a
total of eight transmitters. If an RKE transmitter is
inoperative or lost, new transmitter vehicle access
codes can be programmed into the system using a
DRB IIItscan tool.
This vehicle also offers several customer program-
mable features, which allows the selection of several
optional electronic features to suit individual prefer-
ences. Customer programmable feature options
affecting the RKE system include:
²Automatic Door Lock- Customer programma-
ble feature that allows the BCM to perform an auto-
matic door lock if the vehicle speed is above 25.7
km/h (15 miles-per-hour).
²Automatic Door Unlock On Exit- Customer
programmable feature that allows the BCM to per-
form an automatic door unlock if the vehicle speed is
0, vehicle in park and driver door is opened.
²Flash Lights with Lock and Unlock- Allows
the option of having the park lamps flash as an opti-
cal verification that the RKE system received a valid
Lock request or Unlock request from the RKE trans-
mitter, or having no optical verification.
²Programming Additional Transmitters-
Allows up to a total of four transmitter vehicle access
codes to be stored.
²Remote Unlock Sequence- Allows the option
of having only the driver side front door unlock when
the RKE transmitter Unlock button is depressed the
first time. The remaining doors unlock when the but-
ton is depressed a second time within 5 seconds of
the first unlock press. Another option is having all
doors unlock upon the first depression of the RKE
transmitter Unlock button.
²Sound Horn on Lock- Allows the option of
having the horn sound a short chirp as an audible
verification that the RKE system received a validLock request from the RKE transmitter, or having no
audible verification.
OPERATION
POWER LOCKS
The Body Control Module (BCM) locks or unlocks
the doors when an actuation input signal from a door
lock switch, Central Lock key cylinder or Remote
Keyless Entry (RKE) is received. The BCM turns on
the output drivers and provides a voltage level to the
door lock motor for a specified time.
REMOTE KEYLESS ENTRY
The RKE transmitter uses radio frequency signals
to communicate with the SKREEM module. The
SKREEM is on the PCI bus. When the operator
presses a button on the transmitter, it sends a spe-
cific request to the SKREEM. In turn, the SKREEM
sends the appropriate request over the PCI bus to
the following:
²Integrated Power Module (IPM)- to activate
the park lamps, the headlamps and the horn for the
horn chirp.
²Power Liftgate Module (PLGM)- to control
the liftgate lock and unlock functions.
After pressing the lock button on the RKE trans-
mitter, all of the door locks will lock, the illuminated
entry will turn off (if all doors are closed) and the
vehicle theft security system (if equipped) will arm.
Pressing the unlock button one time will unlock
the driver door, or all doors based on the customer
programmable feature enabled, the illuminated entry
will turn on the courtesy lamps and the vehicle theft
security system (if equipped) will disarm. Pressing
the unlock button a second time, the remaining door
locks will unlock.
If the vehicle is equipped with the memory system,
the memory message will identify which transmitter
(1 or 2) sent the signal.
ROLLING CODE
The rolling code feature changes part of the trans-
mitter message each time that it is used. The trans-
mitter message and the receiver message increment
together. Under certain conditions with a rolling code
system, such as pressing a button on the RKE trans-
mitter over 255 times outside of receiver range or
replacing the battery, the receiver and transmitter
can fall out of synchronization. To re-synchronize,
press and release the UNLOCK button on the RKE
transmitter repeatedly (it may take up to eight
cycles) while listening carefully for the power door
locks in the vehicle to cycle, indicating that resyn-
chronization has occurred.
RSPOWER LOCKS8N-21
POWER LOCKS (Continued)

Page 498 of 2339

CHRYSLER CARAVAN 2005 Service Manual Service replacement clocksprings are shipped pre-
centered and with a molded plastic shield that snaps
onto the rotor over the release button. The release
button secures the centered clockspring rotor

Service replacement clocksprings are shipped pre-
centered and with a molded plastic shield that snaps
onto the rotor over the release button. The release
button secures the centered clockspring rotor to the
clockspring case and the shield prevents the release
button from being inadvertently depressed during
shipment and handling, but the shield must be
removed from the clockspring after it is installed on
the steering column (Refer to 8 - ELECTRICAL/RE-
STRAINTS/CLOCKSPRING - STANDARD PROCE-
DURE).
The clockspring cannot be repaired. If the clock-
spring is faulty, damaged, or if the driver airbag has
been deployed, the clockspring must be replaced.
OPERATION
The clockspring is a mechanical electrical circuit
component that is used to provide continuous electri-
cal continuity between the fixed instrument panel
wire harness and the electrical components mounted
on or in the rotating steering wheel. The rotating
electrical components include the driver airbag, the
horn switch, the speed control switches, and the
remote radio switches, if the vehicle is so equipped.
The clockspring case is positioned and secured to the
upper steering column housing near the top of the
steering column. The connector receptacles on the
tail of the clockspring case connect the clockspring to
the vehicle electrical system through two connectors
from the instrument panel wire harness.
The clockspring rotor is movable and is keyed by
the tower formation that is molded onto the upper
surface of the rotor hub to an opening that is cast
into the steering wheel armature. Rubber bumper
blocks on either side of the clockspring tower forma-
tion eliminate contact noise between the clockspring
tower and the steering wheel. The lobe of the turn
signal cancel cam on the lower surface of the clock-
spring rotor hub contacts a turn signal cancel actua-
tor of the multi-function switch to provide automatic
turn signal cancellation. The yellow or black-sleeved
pigtail wires on the upper surface of the clockspring
rotor connect the clockspring to the driver airbag,
while a steering wheel wire harness connects the
connector receptacle on the upper surface of the
clockspring rotor to the horn switch and, if the vehi-
cle is so equipped, to the optional speed control
switches and remote radio switches on the steering
wheel.
The clockspring tape has travel limits and can be
damaged by being wound too tightly during full stop-
to-stop steering wheel rotation. To prevent this from
occurring, the clockspring is centered when it is
installed on the steering column. Centering the clock-
spring indexes the clockspring tape to the movable
steering components so that the tape can operatewithin its designed travel limits. However, if the
clockspring is removed from the steering column or if
the steering shaft is disconnected from the steering
gear, the clockspring spool can change position rela-
tive to the movable steering components and must be
re-centered following completion of the service or the
tape may be damaged (Refer to 8 - ELECTRICAL/
RESTRAINTS/CLOCKSPRING - STANDARD PRO-
CEDURE).
Service replacement clocksprings are shipped pre-
centered and with a plastic shield installed over the
clockspring release button. This shield should not be
removed and the release button should not be
depressed until the clockspring has been installed on
the steering column. If the release button is
depressed before the clockspring is installed on a
steering column, the clockspring centering procedure
must be performed (Refer to 8 - ELECTRICAL/RE-
STRAINTS/CLOCKSPRING - STANDARD PROCE-
DURE).
STANDARD PROCEDURE - CLOCKSPRING
CENTERING
If the rotating tape (wire coil) in the clockspring is
not positioned properly with the steering wheel and
the front wheels, the clockspring may fail. The fol-
lowing procedure MUST BE USED to center the
clockspring if it is not known to be properly posi-
tioned, or if the front wheels were moved from the
straight ahead position.
(1) Position steering wheel and front wheels
straight ahead.
(2) Release hood latch and open hood.
(3) Disconnect and isolate the battery negative
cable.
(4) Wait two minutes for the system reserve capac-
itor to discharge before beginning any airbag compo-
nent service.
(5) Remove driver airbag from steering wheel
(Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER
AIRBAG - REMOVAL).
(6) Disconnect wire connectors from back of driver
airbag.
(7) Disconnect the 2±way connector from remote
radio control harness (if equipped).
(8) Disconnect the 4±way harness connector from
the speed control (if equipped)/horn harness to the
clockspring.
(9) Remove steering wheel (Refer to 19 - STEER-
ING/COLUMN/STEERING WHEEL - REMOVAL).
(10) Rotate the clockspring rotor clockwise until
the rotor stops. Do not apply excessive force.
(11) From the end of travel, rotate the rotor two
turns counterclockwise until the wires end up at the
top.
RSRESTRAINTS8O-11
CLOCKSPRING (Continued)

Page 654 of 2339

CHRYSLER CARAVAN 2005 Service Manual 8W-15 GROUND DISTRIBUTION
Component Page
A/C Compressor Clutch...................8W-15-2, 9
A/C-Heater Control....................8W-15-10, 12
Adjustable Pedals Switch...................8W-15-11
Ampli

8W-15 GROUND DISTRIBUTION
Component Page
A/C Compressor Clutch...................8W-15-2, 9
A/C-Heater Control....................8W-15-10, 12
Adjustable Pedals Switch...................8W-15-11
Amplifier............................8W-15-27
Auto Temp Control......................8W-15-10
Back-Up Lamp Switch...................8W-15-2, 4
Battery...........................8W-15-2, 3, 4
Body Control Module.....................8W-15-24
Brake Fluid Level Switch..................8W-15-18
Brake Lamp Switch......................8W-15-18
Cabin Heater Assist......................8W-15-9
CD Changer...........................8W-15-13
Center High Mounted Stop Lamp.............8W-15-30
Clutch Pedal Interlock Switch................8W-15-18
Clutch Pedal Upstop Switch.................8W-15-19
Controller Antilock Brake.................8W-15-2, 4
Crank Case Ventilation Heater................8W-15-9
Crankshaft Position Sensor..................8W-15-4
Data Link Connector..................8W-15-3, 4, 18
Dosing Pump...........................8W-15-9
Driver Door Courtesy Lamp...............8W-15-15, 21
Driver Door Lock Switch.................8W-15-15, 21
Driver Heated Seat Cushion.................8W-15-17
Driver Heated Seat Module.................8W-15-17
Driver Power Seat Switch..................8W-15-17
Driver Power Window Switch..............8W-15-15, 21
DVD/CD Changer.......................8W-15-11
EGR Solenoid..........................8W-15-3
Engine Control Module.....................8W-15-4
Floor Console Lamp......................8W-15-28
Floor Console Power Outlet.................8W-15-28
Front Blower Module.....................8W-15-12
Front Cigar Lighter......................8W-15-10
Front Control Module................8W-15-2, 8, 9, 19
Front Reading Lamps/Switch................8W-15-22
Fuel Heater...........................8W-15-28
Fuel Heater Relay........................8W-15-4
Fuel Pump Module......................8W-15-28
G100..............................8W-15-2, 4
G101..............................8W-15-2, 4
G102.............................8W-15-5, 6, 7
G103................................8W-15-9
G200..........................8W-15-10, 11, 12
G201...............................8W-15-13
G202...............................8W-15-13
G300....................8W-15-12, 14, 16, 17, 18, 19
G301......................8W-15-20, 21, 22, 24, 25
G302..........................8W-15-26, 27, 28
G303..........................8W-15-28, 29, 30
Generator.............................8W-15-2
Hands Free Module......................8W-15-11
Headlamp Switch.......................8W-15-10
Headlamp Washer Pump Motor...............8W-15-7
High Note Horn.........................8W-15-6
Hood Ajar Switch.......................8W-15-19
Horn Switch..........................8W-15-12
Instrument Cluster......................8W-15-10
Instrument Panel Switch Bank...............8W-15-10
Integrated Power Module...........8W-15-2, 3, 4, 8, 9, 19
Left B-Pillar Switch......................8W-15-18
Left Cinch/Release Motor..................8W-15-14
Left Cylinder Lock Switch................8W-15-15, 16
Left Fog Lamp..........................8W-15-6
Left Front Door Ajar Switch.................8W-15-16
Left Front Door Lock Motor/Ajar Switch.......8W-15-15, 16
Left Front Park/Turn Signal Lamp.............8W-15-6
Left Full Open Switch....................8W-15-14
Left Headlamp.........................8W-15-19
Left Headlamp Leveling Motor................8W-15-7
Left High Beam Lamp...................8W-15-8, 19
Left Liftgate Flood Lamp...................8W-15-29
Left Low Beam Lamp...................8W-15-8, 19
Left Mid Reading Lamp...................8W-15-23
Left Park Lamp.......................8W-15-8, 19
Left Power Mirror.......................8W-15-12
Left Rear Lamp Assembly..................8W-15-28
Left Rear Reading Lamp...................8W-15-23
Left Sliding Door Control Module.............8W-15-14
Left Sliding Door Latch Sensing Switch..........8W-15-14
Left Sliding Door Lock Motor................8W-15-14
Left Sliding Door Lock Motor/Ajar Switch........8W-15-14
Left Sliding Door Motor...................8W-15-14Component Page
Left Turn Signal Lamp....................8W-15-19
Left Visor/Vanity Lamp....................8W-15-23
License Lamp.......................8W-15-26, 29
Lift Pump Motor........................8W-15-28
Liftgate Ajar Switch......................8W-15-30
Liftgate Cinch/Release Motor..............8W-15-26, 30
Liftgate Right Pinch Sensor.................8W-15-26
Memory Seat/Mirror/Adjustable Pedals Module.....8W-15-17
Natural Vacuum Leak Detection Assembly.......8W-15-2, 3
Occupant Classification Module...............8W-15-24
Occupant Restraint Controller...............8W-15-13
Overhead Console.......................8W-15-22
Oxygen Sensor 1/1 Upstream.................8W-15-3
Oxygen Sensor 1/2 Downstream...............8W-15-3
Park Assist Display......................8W-15-28
Park Assist Module......................8W-15-28
Passenger Door Courtesy Lamp............8W-15-16, 21
Passenger Door Lock Switch..............8W-15-16, 21
Passenger Heated Seat Back................8W-15-25
Passenger Heated Seat Cushion..............8W-15-25
Passenger Heated Seat Module...............8W-15-25
Passenger Power Seat Switch................8W-15-25
Power Folding Mirror Switch................8W-15-12
Power Liftgate Module..................8W-15-26, 28
Power Liftgate Motor.....................8W-15-26
Power Mirror Switch.....................8W-15-12
Power Outlet..........................8W-15-10
Power Window Switch....................8W-15-15
Powertrain Control Module..................8W-15-3
Radiator Fan No. 1.......................8W-15-5
Radiator Fan No. 2.......................8W-15-5
Radiator Fan Relay.......................8W-15-5
Radiator Fan Relay No. 3...................8W-15-5
Radio...............................8W-15-13
Rear Auto Temp Control Switch..............8W-15-18
Rear Blower Front Control Switch.............8W-15-12
Rear Blower Motor Power Module.............8W-15-28
Rear Blower Rear Control Switch.............8W-15-18
Rear Dome Lamp.....................8W-15-22, 23
Rear Power Outlet.......................8W-15-28
Rear View Mirror.....................8W-15-11, 22
Rear Window Defogger Grid.................8W-15-30
Rear Wiper Motor.......................8W-15-29
Right B-Pillar Switch.....................8W-15-24
Right Cinch/Release Motor..................8W-15-20
Right Cylinder Lock Switch.................8W-15-21
Right Fog Lamp.........................8W-15-6
Right Front Door Ajar Switch................8W-15-21
Right Front Door Lock Motor/Ajar Switch........8W-15-21
Right Front Park/Turn Signal Lamp............8W-15-6
Right Full Open Switch...................8W-15-20
Right Headlamp........................8W-15-19
Right Headlamp Leveling Motor...............8W-15-7
Right High Beam Lamp..................8W-15-8, 19
Right Liftgate Flood Lamp..................8W-15-29
Right Low Beam Lamp..................8W-15-8, 19
Right Mid Reading Lamp..................8W-15-23
Right Park Lamp......................8W-15-8, 19
Right Power Mirror....................8W-15-11, 12
Right Rear Lamp Assembly...............8W-15-27, 28
Right Rear Reading Lamp..................8W-15-23
Right Sliding Door Control Module............8W-15-20
Right Sliding Door Latch Sensing Switch.........8W-15-20
Right Sliding Door Lock Motor...............8W-15-20
Right Sliding Door Lock Motor/Ajar Switch.......8W-15-20
Right Sliding Door Motor..................8W-15-20
Right Turn Signal Lamp...................8W-15-19
Right Visor/Vanity Lamp...................8W-15-23
Sentry Key Remote Entry Module.............8W-15-11
Siren...............................8W-15-11
Speed Control Servo......................8W-15-2
Sunroof Module........................8W-15-27
Sunroof Switch.........................8W-15-23
Thatcham Alarm Module...................8W-15-11
Traction Control Switch...................8W-15-11
Trailer Tow Connector....................8W-15-27
Transmission Control Module.................8W-15-4
Transmission Control Relay................8W-15-3, 4
Washer Fluid Level Switch..................8W-15-5
Wiper Module..........................8W-15-18
RS8W-15 GROUND DISTRIBUTION8W-15-1

Page 684 of 2339

CHRYSLER CARAVAN 2005 Service Manual 8W-18 BUS COMMUNICATIONS
Component Page
A/C-Heater Control................... 8W-18-6
Amplifier.......................... 8W-18-5
Auto Temp Control................... 8W-18-6
Battery..................

Page 1400 of 2339

CHRYSLER CARAVAN 2005 Service Manual Also like the cam and crank sensors, a 5 volt ref-
erence is supplied from the PCM and returns a volt-
age signal to the PCM that reflects manifold
pressure. The zero pressure reading is 0.5V and full

Also like the cam and crank sensors, a 5 volt ref-
erence is supplied from the PCM and returns a volt-
age signal to the PCM that reflects manifold
pressure. The zero pressure reading is 0.5V and full
scale is 4.5V. For a pressure swing of0Ð15psithe
voltage changes 4.0V. The sensor is supplied a regu-
lated 4.8 to 5.1 volts to operate the sensor. Like the
cam and crank sensors ground is provided through
the sensor return circuit.
The MAP sensor input is the number one contrib-
utor to pulse width. The most important function of
the MAP sensor is to determine barometric pressure.
The PCM needs to know if the vehicle is at sea level
or is it in Denver at 5000 feet above sea level,
because the air density changes with altitude. It will
also help to correct for varying weather conditions. If
a hurricane was coming through the pressure would
be very, very low or there could be a real fair
weather, high pressure area. This is important
because as air pressure changes the barometric pres-
sure changes. Barometric pressure and altitude have
a direct inverse correlation, as altitude goes up baro-
metric goes down. The first thing that happens as
the key is rolled on, before reaching the crank posi-
tion, the PCM powers up, comes around and looks at
the MAP voltage, and based upon the voltage it sees,
it knows the current barometric pressure relative to
altitude. Once the engine starts, the PCM looks at
the voltage again, continuously every 12 milliseconds,
and compares the current voltage to what it was at
key on. The difference between current and what it
was at key on is manifold vacuum.
During key On (engine not running) the sensor
reads (updates) barometric pressure. A normal range
can be obtained by monitoring known good sensor in
you work area.As the altitude increases the air becomes thinner
(less oxygen). If a vehicle is started and driven to a
very different altitude than where it was at key On
the barometric pressure needs to be updated. Any
time the PCM sees Wide Open throttle, based upon
TPS angle and RPM it will update barometric pres-
sure in the MAP memory cell. With periodic updates,
the PCM can make its calculations more effectively.
The PCM uses the MAP sensor to aid in calculat-
ing the following:
²Barometric pressure
²Engine load
²Manifold pressure
²Injector pulse-width
²Spark-advance programs
²Shift-point strategies (F4AC1 transmissions
only, via the PCI bus)
²Idle speed
²Decel fuel shutoff
The PCM recognizes a decrease in manifold pres-
sure by monitoring a decrease in voltage from the
reading stored in the barometric pressure memory
cell. The MAP sensor is a linear sensor; as pressure
changes, voltage changes proportionately. The range
of voltage output from the sensor is usually between
4.6 volts at sea level to as low as 0.3 volts at 26 in. of
Hg. Barometric pressure is the pressure exerted by
the atmosphere upon an object. At sea level on a
standard day, no storm, barometric pressure is 29.92
in Hg. For every 100 feet of altitude barometric pres-
sure drops .10 in. Hg. If a storm goes through it can
either add, high pressure, or decrease, low pressure,
from what should be present for that altitude. You
should make a habit of knowing what the average
pressure and corresponding barometric pressure is
for your area.
REMOVAL
REMOVAL - 2.4L
(1) Disconnect the negative battery cable.
(2) Disconnect electrical connector and vacuum
hose from MAP sensor (Fig. 20).
(3) Remove two screws holding sensor to the
intake manifold.
REMOVAL - 3.3/3.8L
(1) Disconnect the negative battery cable.
(2) Remove vacuum hose and mounting screws
from manifold absolute pressure (MAP) sensor (Fig.
21).
(3) Disconnect electrical connector from sensor.
Remove sensor.
Fig. 21 MAP SENSOR - 3.3/3.8L
RSFUEL INJECTION14-35
MAP SENSOR (Continued)

fold seats tow bar engine coolant airbag off fuel consumption spark plugs