2003 CHRYSLER CARAVAN key battery

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - SENTRY KEY
IMMOBILIZER SYSTEM
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS,
WARNINGS, BEFORE ATTEMPTING COMPONENT
DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
NOTE: The following tests may not prove conclu-
sive in the diagnosis of this system. The most reli-
able, efficient, and accurate means to diagnose the
Sentry Key Immobilizer System involves the use of
a DRB IIITscan tool. Refer to the proper Body Diag-
nostic Procedures Manual.
The Sentry Key Immobilizer System (SKIS) and
the Programmable Communication Interface (PCI)
bus network should be diagnosed using a DRB IIIt
scan tool. The DRB IIItwill allow confirmation that
the PCI bus is functional, that the Sentry Key Immo-
bilizer Module (SKIM) is placing the proper messages
on the PCI bus, and that the Powertrain Control
Module (PCM) is receiving the PCI bus messages.
Refer to the proper Body Diagnostic Procedures man-
ual, and Wiring Diagrams for complete circuit
descriptions and diagrams.
(1) Check the fuses in the Integrated Power Mod-
ule (IPM). If OK, go to Step 2. If not OK, repair the
shorted circuit or component as required and replace
the faulty fuse.
(2) Disconnect and isolate the battery negative
remote cable from the remote terminal. Unplug the
wire harness connector at the SKIM. Check for con-
tinuity between the ground circuit cavity of the
SKIM wire harness connector and a good ground.
There should be continuity. If OK, go to Step 3. If not
OK, repair the open circuit to ground as required.
(3) Connect the battery negative cable. Check for
battery voltage at the fused B(+) circuit cavity of the
SKIM wire harness connector. If OK, go to Step 4. If
not OK, repair the open circuit to the fuse in the
IPM as required.
(4) Turn the ignition switch to the ON position.
Check for battery voltage at the fused ignition switch
output (run/start) circuit cavity of the SKIM wire
harness connector. If OK, use a DRB IIItscan tool
and the proper Body Diagnostic Procedures manual
to complete the diagnosis of the SKIS. If not OK,
repair the open circuit to the fuse in the IPM as
required.
DIAGNOSIS AND TESTING - VEHICLE THEFT
SECURITY SYSTEM
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire har-
ness connectors, splices and grounds. Using a DRB
IIItscan tool. Refer to the proper Body Diagnostic
Procedures Manual for test procedures.
HOOD AJAR SWITCH -
EXPORT
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Using a small flat blade screwdriver, pry trig-
ger switch from the bracket on the left fender well.
(3) Disconnect the hood ajar switch from the wire
connector and remove from vehicle.
INSTALLATION
(1) Connect the hood ajar switch to the wire conec-
tor.
(2) Press the hood ajar switch into position on the
bracket located on the left inner fender well.
(3) Reconnect the battery negative cable.
(4) Close the hood and check for proper operation.
TRANSPONDER KEY
DESCRIPTION
The Sentry Key Immobilizer System (SKIS) uses a
transponder chip that is integral to each ignition key
(Fig. 1) to communicate with the Sentry Key Immo-
bilizer Module (SKIM). Ignition keys are supplied
with the vehicle when it is shipped from the factory.
The transponder chip is undermolded within the
head of the key. This undermold is hidden beneath
an overmolded rubber cap.
OPERATION
Each Sentry Key has a unique transponder identi-
fication code permanently programmed into it by the
manufacturer. Likewise, the SKIM has a unique
9Secret Key9code programmed into it by the manu-
facturer as well. When a Sentry Key is programmed
into the memory of the SKIM, the SKIM stores the
transponder identification code from the Sentry Key,
and the Sentry Key learns the9Secret Key9code from
the SKIM. Once the Sentry Key learns the9Secret
Key9code of the SKIM, it is also permanently pro-
RSVEHICLE THEFT SECURITY8Q-3
VEHICLE THEFT SECURITY (Continued)
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8W-15 GROUND DISTRIBUTION
Component PageA/C Compressor Clutch......................8W-15-8, 9
A/C-Heater Control......................8W-15-10, 12
Adjustable Pedals Module.....................8W-15-11
Airbag Control Module.......................8W-15-13
Auto Temp Control.........................8W-15-10
Automatic Day/Night Mirror...................8W-15-23
Back-Up Lamp Switch......................8W-15-4, 8
Battery.............................8W-15-2, 3, 4
Body Control Module.......................8W-15-24
Brake Fluid Level Switch.....................8W-15-19
Brake Lamp Switch........................8W-15-19
Cabin Heater Assist.........................8W-15-9
Center Dome Lamp........................8W-15-23
Center High Mounted Stop Lamp.................8W-15-28
Clutch Pedal Interlock Switch...................8W-15-19
Clutch Pedal Upstop Switch....................8W-15-20
Controller Antilock Brake...................8W-15-2, 3, 4
Crank Case Ventilation Heater...................8W-15-9
Crankshaft Position Sensor.....................8W-15-4
Data Link Connector...................8W-15-2, 3, 4, 19
Dosing Pump............................8W-15-9
Driver Door Courtesy Lamp..................8W-15-16, 22
Driver Door Lock Switch....................8W-15-16, 22
Driver Heated Seat Cushion....................8W-15-18
Driver Heated Seat Module....................8W-15-18
Driver Power Seat Switch.....................8W-15-18
Driver Power Window Switch...................8W-15-16
Driver Power Window Switch...................8W-15-22
DVD/CD Changer.........................8W-15-11
Engine Control Module.......................8W-15-4
Floor Console Lamp........................8W-15-27
Floor Console Power Outlet....................8W-15-27
Front Blower Module.......................8W-15-12
Front Cigar Lighter........................8W-15-10
Front Control Module....................8W-15-8, 9, 20
Front Reading Lamps/Switch...................8W-15-23
Fuel Heater............................8W-15-27
Fuel Heater Relay..........................8W-15-4
Fuel Pump Module.........................8W-15-27
G100..............................8W-15-2, 3, 4
G101..............................8W-15-2, 3, 4
G102..............................8W-15-5, 6, 7
G103...............................8W-15-8, 9
G200............................8W-15-10, 11, 12
G201................................8W-15-13
G202................................8W-15-14
G300........................8W-15-15, 17, 18, 19, 20
G301..........................8W-15-21, 22, 23, 24
G302............................8W-15-25, 26, 27
G303..............................8W-15-27, 28
Generator..............................8W-15-8
Headlamp Switch.........................8W-15-10
Headlamp Washer Pump Motor..................8W-15-7
High Note Horn..........................8W-15-6 7
Hood Ajar Switch.........................8W-15-20
Instrument Cluster........................8W-15-10
Instrument Panel Switch Bank..................8W-15-11
Integrated Power Module..............8W-15-2, 3, 4, 8, 9, 20
Left B-Pillar Switch........................8W-15-19
Left Cinch/Release Motor.....................8W-15-15
Left Combination Relay......................8W-15-26
Left Cylinder Lock Switch...................8W-15-16 17
Left Door Speaker.........................8W-15-14
Left Fog Lamp..........................8W-15-6, 7
Left Front Door Ajar Switch....................8W-15-17
Left Front Door Lock Motor/Ajar Switch...........8W-15-16, 17
Left Front Park/Turn Signal Lamp.................8W-15-6
Left Full Open Switch.......................8W-15-15
Left Headlamp...........................8W-15-20
Left Headlamp Leveling Motor...................8W-15-7
Left High Beam Lamp.......................8W-15-20
Left Liftgate Flood Lamp.....................8W-15-28
Left Low Beam Lamp.......................8W-15-20
Left Mid Reading Lamp......................8W-15-23
Left Park Lamp..........................8W-15-20
Left Power Mirror.........................8W-15-11
Left Rear Lamp Assembly.....................8W-15-26
Left Rear Reading Lamp......................8W-15-23
Left Rear Speaker.........................8W-15-14
Left Side Impact Airbag Control Module.............8W-15-13
Left Sliding Door Control Module.................8W-15-15
Left Sliding Door Latch Sensing Switch.............8W-15-15
Left Sliding Door Lock Motor...................8W-15-15
Left Sliding Door Lock Motor/Ajar Switch............8W-15-15Component PageLeft Sliding Door Motor......................8W-15-15
Left Stop/Turn Signal Relay....................8W-15-26
Left Turn Signal Lamp......................8W-15-20
Left Visor/Vanity Lamp......................8W-15-23
License Lamp.........................8W-15-25, 28
Lift Pump Motor..........................8W-15-27
Liftgate Ajar Switch........................8W-15-28
Liftgate Cinch/Release Motor...................8W-15-25
Liftgate Cylinder Lock Switch...................8W-15-28
Liftgate Right Pinch Sensor....................8W-15-25
Low Note Horn..........................8W-15-6, 7
Memory Seat/Mirror Module...................8W-15-18
Natural Vacuum Leak Detection Assembly.............8W-15-8
Overhead Console.........................8W-15-23
Oxygen Sensor 1/1 Upstream....................8W-15-2
Oxygen Sensor 1/2 Downstream.................8W-15-2, 8
Passenger Door Courtesy Lamp................8W-15-17, 22
Passenger Door Lock Switch.................8W-15-17, 22
Passenger Heated Seat Cushion..................8W-15-24
Passenger Heated Seat Module..................8W-15-24
Passenger Power Seat Switch...................8W-15-24
Passenger Power Window Switch...............8W-15-17, 22
Power Folding Mirror Switch...................8W-15-12
Power Liftgate Module.......................8W-15-25
Power Liftgate Motor.......................8W-15-25
Power Mirror Switch........................8W-15-12
Power Outlet............................8W-15-10
Power Window Switch.......................8W-15-16
Powertrain Control Module...................8W-15-2, 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-15-14
Rear Auto Temp Control Switch..................8W-15-19
Rear Blower Front Control Switch................8W-15-12
Rear Blower Motor Power Module..............8W-15-12, 27
Rear Blower Rear Control Switch.................8W-15-19
Rear Dome Lamp.........................8W-15-23
Rear Power Outlet.........................8W-15-27
Rear Window Defogger Grid....................8W-15-28
Rear Wiper Motor.........................8W-15-28
Remote Keyless Entry Module...................8W-15-11
Right B-Pillar Switch.......................8W-15-24
Right Cinch/Release Motor....................8W-15-21
Right Combination Relay.....................8W-15-26
Right Cylinder Lock Switch....................8W-15-22
Right Door Speaker........................8W-15-14
Right Fog Lamp.........................8W-15-6, 7
Right Front Door Ajar Switch...................8W-15-22
Right Front Door Lock Motor/Ajar Switch............8W-15-22
Right Front Park/Turn Signal Lamp................8W-15-6
Right Full Open Switch......................8W-15-21
Right Headlamp..........................8W-15-20
Right Headlamp Leveling Motor..................8W-15-7
Right High Beam Lamp......................8W-15-20
Right Liftgate Flood Lamp....................8W-15-28
Right Low Beam Lamp......................8W-15-20
Right Mid Reading Lamp.....................8W-15-23
Right Park Lamp..........................8W-15-20
Right Power Mirror........................8W-15-11
Right Rear Lamp Assembly....................8W-15-27
Right Rear Reading Lamp.....................8W-15-23
Right Rear Speaker........................8W-15-14
Right Side Impact Airbag Control Module............8W-15-13
Right Sliding Door Control Module................8W-15-21
Right Sliding Door Latch Sensing Switch.............8W-15-21
Right Sliding Door Lock Motor..................8W-15-21
Right Sliding Door Lock Motor/Ajar Switch...........8W-15-21
Right Sliding Door Motor.....................8W-15-21
Right Stop/Turn Signal Relay...................8W-15-26
Right Turn Signal Lamp......................8W-15-20
Right Visor/Vanity Lamp.....................8W-15-23
Sentry Key Immobilizer Module..................8W-15-11
Speed Control Servo.........................8W-15-8
Sunroof Module..........................8W-15-26
Sunroof Switch...........................8W-15-23
Traction Control Switch......................8W-15-11
Trailer Tow Connector.......................8W-15-26
Transmission Control Module....................8W-15-3
Transmission Control Relay...................8W-15-2, 3
Washer Fluid Level Switch....................8W-15-6, 7
Wiper Module...........................8W-15-19
RS8W-15 GROUND DISTRIBUTION8W-15-1
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8W-18 BUS COMMUNICATIONS
Component Page
A/C-Heater Control................... 8W-18-7
Airbag Control Module................ 8W-18-7
Auto Temp Control................... 8W-18-7
Battery............................ 8W-18-2
Body Control Module........... 8W-18-3, 4, 5, 6
Cabin Heater Assist.................. 8W-18-5
CD Changer........................ 8W-18-7
Controller Antilock Brake.......... 8W-18-3, 4, 5
Data Link Connector......... 8W-18-2, 3, 4, 5, 6
DVD/CD Changer.................... 8W-18-7
Engine Control Module................ 8W-18-5
Front Control Module........... 8W-18-3, 4, 5, 6
G100.............................. 8W-18-2
G101.............................. 8W-18-2
G300.............................. 8W-18-2
Instrument Cluster................... 8W-18-7
Integrated Power Module...... 8W-18-2, 3, 4, 5, 6Component Page
Left Side Impact Airbag Control Module . . 8W-18-6
Left Sliding Door Control Module........ 8W-18-6
Memory Seat/Mirror Module........... 8W-18-6
Overhead Console.................... 8W-18-6
Power Liftgate Module................ 8W-18-6
Powertrain Control Module............ 8W-18-3
Powertrain Control Module............ 8W-18-4
PTC7............................. 8W-18-2
Radio............................. 8W-18-7
Right Side Impact Airbag Control
Module.......................... 8W-18-6
Right Sliding Door Control Module...... 8W-18-6
Sentry Key Immobilizer Module......... 8W-18-7
Siren............................. 8W-18-7
Thatcham Alarm Module.............. 8W-18-7
Transmission Control Module........... 8W-18-4
RS8W-18 BUS COMMUNICATIONS8W-18-1
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The IPM has a molded plastic cover that can be
removed to provide service access to all of the fuses
and relays in the IPM. An integral latch and hinges
are molded into the IPM cover for easy removal. A
fuse layout map is integral to the underside of the
IPM cover to ensure proper fuse and relay identifica-
tion. The IOD fuse is a 20 ampere blade-type mini
fuse and, when removed, it is stored in a fuse cavity
adjacent to the washer fuse within the IPM.
OPERATION
The term ignition-off draw identifies a normal con-
dition where power is being drained from the battery
with the ignition switch in the Off position. The IOD
fuse feeds the memory and sleep mode functions for
some of the electronic modules in the vehicle as well
as various other accessories that require battery cur-
rent when the ignition switch is in the Off position,
including the clock. The only reason the IOD fuse is
removed is to reduce the normal IOD of the vehicle
electrical system during new vehicle transportation
and pre-delivery storage to reduce battery depletion,
while still allowing vehicle operation so that the
vehicle can be loaded, unloaded and moved as needed
by both vehicle transportation company and dealer
personnel.
The IOD fuse is removed from the IPM fuse cavity
when the vehicle is shipped from the assembly plant.
Dealer personnel must install the IOD fuse when the
vehicle is being prepared for delivery in order to
restore full electrical system operation. Once the
vehicle is prepared for delivery, the IOD function of
this fuse becomes transparent and the fuse that has
been assigned the IOD designation becomes only
another Fused B(+) circuit fuse. The IOD fuse serves
no useful purpose to the dealer technician in the ser-
vice or diagnosis of any vehicle system or condition,
other than the same purpose as that of any other
standard circuit protection device.
The IOD fuse can be used by the vehicle owner as
a convenient means of reducing battery depletion
when a vehicle is to be stored for periods not to
exceed about thirty days. However, it must be
remembered that removing the IOD fuse will not
eliminate IOD, but only reduce this normal condition.
If a vehicle will be stored for more than about thirty
days, the battery negative cable should be discon-
nected to eliminate normal IOD; and, the battery
should be tested and recharged at regular intervals
during the vehicle storage period to prevent the bat-
tery from becoming discharged or damaged. Refer to
Battery Systemfor additional service information.
REMOVAL
(1) Turn the ignition switch to the Off position.(2) Unlatch and open the cover of the intelligent
power module.
(3) Remove the IOD fuse from fuse location
markedIODof the Integrated Power Module (IPM).
(4) Store the removed IOD fuse by installing it in
the unused fuse storage markedSPAREof the IPM.
(5) Close and latch the IPM.
INSTALLATION
(1) Be certain the ignition switch is in the Off posi-
tion.
(2) Unlatch and open the cover of the Integrated
Power Module (IPM).
(3) Use a thumb to press the IOD fuse firmly down
into IPM fuse cavity markedIOD.
(4) Close and latch the IPM cover.
POWER OUTLET
DESCRIPTION
Accessory power outlets are standard equipment on
this model. Two power outlets are installed in the
instrument panel center lower bezel, which is located
near the bottom of the instrument panel center stack
area. Two additional power outlets are also incorpo-
rated into the vehicle, one on the left rear C-pillar
trim and the other in the center console, if equipped.
The power outlets bases are secured by a snap fit in
the appropriate bezels. A hinged plug flips closed to
conceal and protect the power outlet base when the
power outlet is not being used.
The power outlet receptacle unit and the power
outlet plugs are each available for service replace-
ment.
OPERATION
The power outlet base or receptacle shell is con-
nected to ground, and an insulated contact in the
bottom of the shell is connected to battery current.
The power outlet on the instrument panel marked
with a battery receives battery voltage from a fuse in
the Integrated Power Module (IPM) at all times. The
other power outlet on the instrument panel marked
with a key receives battery voltage only when the
key is in the on position.
The power outlet located in the center console
receives battery voltage all the time when positioned
between thefront seatsand key-on voltage when
positioned between therear seats. The power outlet
located on the C-pillar receives battery voltage only
when the key is in the on position.
RS8W-97 POWER DISTRIBUTION SYSTEM8W-97-5
IOD FUSE (Continued)
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DIAGNOSIS AND TESTING
DIAGNOSIS & TESTING - POWER OUTLET
For complete circuit diagrams, refer toCigar
Lighter/Power Outletin Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO RESTRAINTS BEFORE ATTEMPT-
ING ANY STEERING WHEEL, STEERING COLUMN,
SEAT OR INSTRUMENT PANEL COMPONENT DIAG-
NOSIS OR SERVICE. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) Check the fused B(+) fuse in the Integrated
Power Module (IPM). If OK, go to Step 2. If not OK,
repair the shorted circuit or component as required
and replace the faulty fuse.
(2) Check for battery voltage at the fused B(+) fuse
in the IPM. If OK, go to Step 3. If not OK, repair the
open fused B(+) circuit to the IPM fuse as required.
(3)
Open the power outlet door. Check for continuity
between the inside circumference of the power outlet
receptacle and a good ground. There should be continu-
ity. If OK, go to Step 4. If not OK, go to Step 5.
(4) Check for battery voltage at the insulated con-
tact located at the back of the power outlet recepta-
cle. If not OK, go to Step 5.
(5) Disconnect and isolate the battery negative
cable. Remove the appropriate bezel. Check for conti-
nuity between the ground circuit cavity of the power
outlet wire harness connector and a good ground.
There should be continuity. If OK, go to Step 6. If not
OK, repair the open ground circuit to ground as
required.
(6) Connect the battery negative cable. Check for
battery voltage at the fused B(+) circuit cavity of the
power outlet wire harness connector. If OK, replace
the faulty power outlet receptacle. If not OK, repair
the open fused B(+) circuit to the IPM fuse as
required.
REMOVAL
(1)Disconnect and isolate the battery negative cable.
(2) Look inside and note position of the retaining
bosses (Fig. 5).
(3) Using external snap ring pliers with 90 degree
tips. Insert pliers with tips against bosses and
squeeze forcing bosses out of base.
(4) Pull out the base through mounting ring by
gently rocking pliers. A tool can be made to do the
same. Refer to (Fig. 6).
(5) Disconnect the base wires.
(6) Set base aside. Remove light ring and discon-
nect wire.
INSTALLATION
(1) Position the mounting ring on the instrument
panel and feed the wires through the ring. Index the
cap and the mounting ring with the index tab at the
9 o'clock position to the key in the instrument panel.
Install the ring.
(2) Connect the wires to the base. Orientate the
base alignment rib at the 11 o'clock position to mate
the groove in the mounting ring to the base.
(3)
Push the base into the bezel until it locks in place.
(4) Check operation of outlet or element and
install the 12 volt outlet cap.
Fig. 5 Outlet Base Removal
1 - RETAINING BOSSES-ENGAGE PLIERS HERE
2 - PARTIALLY REMOVED
3 - EXTERNAL SNAP-RING PLIERS
4 - PULL BASE OUT-THROUGH MOUNTING RING
Fig. 6 Tool For Outlet Removal
1 - 2.5MM (3/32 INS.)
2 - WELD
3 - 100MM (4 INS.)
4 - 22.25 TO 22.45MM (7/8 TO 57/64 INS.)
8W - 97 - 6 8W-97 POWER DISTRIBUTION SYSTEMRS
POWER OUTLET (Continued)
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OIL PUMP
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKETS -
REMOVAL).
(3) Remove timing belt rear cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT COVER(S)
- REMOVAL).
(4) Remove oil pan (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PAN - REMOVAL).
(5) Remove crankshaft sprocket using Special
Tools 6793 and C-4685-C2 (Fig. 90).
(6) Remove crankshaft key (Fig. 91).
(7) Remove oil pick-up tube.(8) Remove oil pump (Fig. 92) and front crankshaft
seal.
DISASSEMBLY
(1) To remove the relief valve, proceed as follows:
(a) Remove the threaded plug and gasket from
the oil pump (Fig. 93) .
(b) Remove spring and relief valve (Fig. 93) .
Fig. 90 Crankshaft Sprocket - Removal
1 - SPECIAL TOOL 6793
2 - SPECIAL TOOL C-4685±C2
3 - CRANKSHAFT SPROCKET
Fig. 91 Crankshaft Key
1 - CRANKSHAFT KEY
Fig. 92 Oil Pump
1 - BOLTS
2 - BOLTS
3 - OIL PUMP
Fig. 93 Oil Pressure Relief Valve
1 - PLUG
2 - OIL PUMP BODY
3 - RELIEF VALVE
4 - SPRING
5 - SEAL
RSENGINE 2.4L9-55
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FUEL DELIVERY
DESCRIPTION
DESCRIPTION
The front wheel drive car uses a plastic fuel tank
located rear center of the vehicle.
The Fuel Delivery System consists of: the following
items:
²Electric fuel pump module
²Fuel filter
²Tubes/lines/hoses
²Fuel injectors
The in-tank fuel pump module contains the fuel
pump. The pump is serviced as part of the fuel pump
module. Refer to Fuel Pump Module.
The fuel filter is replaceable only as part of the
fuel pump module.
DESCRIPTION - FFV REPLACEMENT PARTS
Many components in a Flexible Fuel Vehicle (FFV)
are designed to be compatible with ethanol. Always
be sure that the vehicle is serviced with correct etha-
nol compatible parts.
CAUTION: Replacing fuel system components with
non-ethanol compatible components can damage
your vehicle and may void the warranty.
OPERATION
The fuel system provides fuel pressure by an
in-tank pump module. The PCM controls the opera-
tion of the fuel system by providing battery voltage
to the fuel pump through the fuel pump relay. The
PCM requires only three inputs and a good ground to
operate the fuel pump relay. The three inputs are:
²Ignition voltage
²Crankshaft Position (CKP) sensor
²Camshaft Position (CMP) sensor
DIAGNOSIS AND TESTING - FUEL DELIVERY
SYSTEM
(Refer to Appropriate Diagnostic Information)
STANDARD PROCEDURE
STANDARD PROCEDURE - FUEL SYSTEM
PRESSURE RELEASE PROCEDURE
(1) Remove Fuel Pump relay from Power Distribu-
tion Center (PDC). For location of relay, refer to label
on underside of PDC cover.
(2) Start and run engine until it stalls.(3) Attempt restarting engine until it will no
longer run.
(4) Turn ignition key to OFF position.
(5) Return fuel pump relay to PDC.
(6) One or more Diagnostic Trouble Codes (DTC's)
may have been stored in PCM memory due to fuel
pump relay removal. The DRB IIItscan tool must be
used to erase a DTC.
STANDARD PROCEDURE - DRAINING FUEL
TANK
Two different procedures may be used to drain fuel
tank (lowering tank or using DRB scan tool).
The quickest draining procedure involves lowering
the fuel tank.
WARNING: RELEASE FUEL SYSTEM PRESSURE
BEFORE SERVICING FUEL SYSTEM COMPONENTS.
SERVICE VEHICLES IN WELL VENTILATED AREAS
AND AVOID IGNITION SOURCES. NEVER SMOKE
WHILE SERVICING THE VEHICLE.
As an alternative procedure, the electric fuel pump
may be activated allowing tank to be drained at fuel
rail connection. Refer to DRBIIItscan tool for fuel
pump activation procedures. Before disconnecting
fuel line at fuel rail, release fuel pressure. Refer to
the Fuel System Pressure Release Procedure in this
group for procedures. Disconnect the fuel line at the
fuel rail and remove the plastic retainer from the
fuel rail. Take plastic retainer and install it back into
the fuel line from body. Attach end of special test
hose tool number 8978 at fuel line connection from
the body line. Position opposite end of this hose tool
to an approved gasoline draining station. Activate
fuel pump and drain tank until empty. When done
remove the special test hose tool number 8978 from
the body line. Remove the plastic retainer from the
special test hose tool number 8978 and reinstall it
into the fuel line from the body. Install the fuel line
to the fuel rail.
If electric fuel pump is not operating, tank must be
lowered for fuel draining. Refer to following proce-
dures.
(1) Remove fuel filler cap.
(2) Perform the Fuel System Pressure Release pro-
cedure.
(3) Disconnect negative cable from battery.
(4) Raise vehicle and support.
(5) Certain models are equipped with a separate
grounding wire (strap) connecting the fuel fill tube
assembly to the body. Disconnect wire by removing
screw.
(6) Open fuel fill door and remove screws mount-
ing fuel filler tube assembly to body. Do not discon-
14 - 2 FUEL DELIVERYRS
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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.
INSTALLATION
INSTALLATION - 2.4L
(1) Install sensor.
(2) Install two screws and tighten.
(3) Connect the electrical connector and vacuum
hose to the MAP sensor (Fig. 20).
(4) Connect the negative battery cable.
INSTALLATION - 3.3/3.8L
(1) Install sensor (Fig. 21).
(2) Install screws and tighten toPLASTIC MAN-
IFOLD 1.7 N´m (15 in. lbs.) ALUMINUM MANI-
FOLD 3.3 N´m (30 in. lbs.).
(3) Connect the electrical connector to the sensor.
Install vacuum hose.
(4) Connect the negative battery cable.
O2 SENSOR
DESCRIPTION
The upstream oxygen sensor threads into the out-
let flange of the exhaust manifold (Fig. 22) or (Fig.
23).
The downstream heated oxygen sensor threads into
the outlet pipe at the rear of the catalytic convertor
(Fig. 24).
OPERATION
For SBEC vehicles a single sensor ground is used
for all 4 O2 sensors (6 Cyl.). A seperate upstream and
downstream grounds are used on the NGC vehicles
(4 Cyl.).
As vehicles accumulate mileage, the catalytic con-
vertor deteriorates. The deterioration results in a
less efficient catalyst. To monitor catalytic convertor
deterioration, the fuel injection system uses two
heated oxygen sensors. One sensor upstream of the
catalytic convertor, one downstream of the convertor.
The PCM compares the reading from the sensors to
calculate the catalytic convertor oxygen storage
RSFUEL INJECTION14-31
MAP SENSOR (Continued)
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