Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager. Manual — part 29
into the regulator, and is restricted from flowing any
further by the blocked return port. When fuel pressure
reaches 328 kPa (47.6 psi) it pushes on the diaphragm,
compresses the spring, and uncovers the fuel return
port. The diaphragm and spring constantly move from
an open to closed position to keep the fuel pressure
constant.
Fig. 18 Throttle Body
Fig. 19 Fuel Pressure Regulator
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FUEL SYSTEM
14 - 63
3.0L MULTI-POINT FUEL INJECTION—GENERAL DIAGNOSIS
INDEX
page
page
60-Way Engine Controller Wiring Connector
. . . . . 73
Circuit Actuation Test Mode
. . . . . . . . . . . . . . . . . 72
Fault Code Description
. . . . . . . . . . . . . . . . . . . . . 69
Fuel System Diagram
. . . . . . . . . . . . . . . . . . . . . . 64
On Board Diagnostics
. . . . . . . . . . . . . . . . . . . . . 67
State Display Test Mode
. . . . . . . . . . . . . . . . . . . . 71
System Tests
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Throttle Body Minimum Air Flow Check
Procedure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Visual Inspection
. . . . . . . . . . . . . . . . . . . . . . . . . 64
FUEL SYSTEM DIAGRAM
The 3.0L MPI system is managed by the engine
controller. The controller receives inputs from various
switches and sensors (Fig. 1). Based on these inputs,
the engine controller adjusts ignition timing and idle
speed through various output devices. Refer to the
Multi-Point Fuel Injection—3.0L Engine section of this
group for system and component descriptions.
VISUAL INSPECTION
A visual inspection for loose, disconnected, or mis-
routed wires and hoses should be made before attempt-
ing to diagnose or service the fuel injection system. A
visual check helps save unnecessary test and diagnos-
tic time. A thorough visual inspection will include the
following checks:
(1) Check for correct spark plug cable routing. En-
sure that the cables are completely connected to the
spark plugs and distributor.
(2) Check ignition coil electrical connections (Fig. 2).
(3) Verify that the electrical connector is attached to
the Purge Solenoid (Fig. 3).
(4) Verify that vacuum connection at Purge Solenoid
is secure and not leaking (Fig. 3).
(5) Verify that the electrical connector is attached to
the MAP sensor (Fig. 4).
(6) Check MAP sensor hose at MAP Sensor Assem-
bly (Fig. 4), and at Vacuum Connection at Intake
Plenum Fitting.
Fig. 1 Multi-Point Fuel Injection Components
14 - 64
FUEL SYSTEM
.
(7) Check alternator wiring connections. Ensure the
accessory drive belt is properly tensioned.
(8) Verify that hoses are securely attached to the
vapor canister (Fig. 5).
(9) Verify the engine ground strap is attached at the
engine and dash panel (Fig. 6 and 7).
(10) Ensure the heated oxygen sensor connector is
connected to the harness connector (Fig. 7).
Fig. 2 Ignition Coil Electrical Connection
Fig. 3 Electrical Connector Canister Purge Solenoid
Fig. 4 Map Sensor Electrical and Vacuum Connec-
tions
Fig. 5 Vapor Canister
Fig. 6 Engine Ground Strap
Fig. 7 Oxygen Sensor Connector
.
FUEL SYSTEM
14 - 65
(11) Verify the distributor connector is connected to
the harness connector (Fig. 8).
(12) Verify the coolant temperature sensor connector
is connected to the harness connector (Fig. 9).
(13) Check vacuum hose connection at fuel pressure
regulator and intake plenum connector (Fig. 9).
(14) Ensure the harness connector is securely at-
tached to each fuel injector.
(15) Check the oil pressure sending unit electrical
connection (Fig. 10).
(16) Check hose connections at throttle body (Fig.
11).
(17) Check throttle body electrical connections (Fig.
11).
(18) Check PCV hose connections (Fig. 12).
(19) If equipped, check EGR system vacuum hose
connections (Fig. 13).
(20) If equipped, check EGR tube to intake plenum
connections (Fig. 13).
(21) Check power brake booster and speed control
connections (Figs. 14).
Fig. 8 Distributor Connector
Fig. 9 Coolant Temperature Sensor Electrical Con-
nections and Vacuum Hose Connections at the Air
Intake Plenum
Fig. 10 Oil Pressure Sending Unit Electrical Connec-
tion
Fig. 11 Throttle Body Electrical and Vacuum Hose
Connections
Fig. 12 Positive Crankcase Ventilation (PCV) System
14 - 66
FUEL SYSTEM
.
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