Dodge RAM TRUCK 1500 1995 Service Manual page 1135

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GENERAL DIAGNOSIS—EXCEPT DIESEL 1 4 - 5 3
M U L T I - P O R T
F U E L
I N J E C T I O N
( M F ! ) — G E N E R A L
DIAGNOSIS—EXCEPT
D I E S E L
page
Automatic Shutdown (ASD) Relay Test 57
Camshaft Position Sensor Test
57
Crankshaft Position Sensor Test
57
Diagnostic Trouble Code (DTC) . . . . . . . . . . . 68
DRB Scan Tool 68
Engine Coolant Temperature Sensor Test . . . . . . .
57
Fuel Injector Test 66
Fuel Pump Pressure Test 66
Fuel Pump Relay Test
59
Idle Air Control (IAC) Motor Test . . . . . . . . . . . . . .
63
Intake Manifold Air Temperature Sensor Test 59
Manifold Absolute Pressure (Map) Sensor Test . . . 59
On-Board Diagnostics (OBD)—Gas Powered
Vehicles 66
WISUAL INSPECTION
A visual inspection for loose, disconnected, or incor­
rectly routed wires and hoses should be made. This
should be done before attempting to diagnose or ser­
vice the fuel injection system. A visual check will
help spot these faults and save unnecessary test and
diagnostic time. A thorough visual inspection will in­
clude the following checks:
(1) Verify that the 60-way connector is fully in­
serted into the connector of the powertrain control
module (PCM) (Fig. 1). Verify that the connector
mounting screw is tightened to 4 N-m (35 in. lbs.)
torque.
PCM
MOUNTING
PCM CONNECTOR
CONNECTOR MOUNTING
BOLT J9414-9
Fig. 1 Powertrain Control Module (PCM)
page
Oxygen (02S) Sensor Heating Element Test . . . . . 62
Powertrain Control Module (PCM) 60-Way
Connector - 57
Powertrain Control Module Testing . . . . . . . . . . . . . 65
Relays—Operation/Testing 64
Starter Motor Relay Test 65
System Schematics 57
Throttle Body Minimum Air Flow Check . . . . . . . . . 61
Throttle Position Sensor Test 61
Transmission Temperature Sensor Test 58
Vehicle Speed Sensor Test 62
Visual Inspection 53
(2) Inspect the battery cable connections. Be sure
that they are clean and tight.
(3) Inspect fuel pump relay and air conditioning
compressor clutch relay (if equipped). Inspect the
ASD relay connections. Inspect starter motor relay
connections. Inspect relays for signs of physical dam­
age and corrosion. The relays are located in the
power distribution center (PDC). The PDC is located
in the engine compartment (Fig. 2). For the location
of this relay within the PDC, refer to PDC cover.
Fig. 2 Power Distribution Center (PDC) Location
(4) Inspect ignition coil connections. Verify that coil
secondary cable(s) is firmly connected to coil (Fig. 3,
4 or 5).
(5) 3.9L/5.2L/5.9L Engines: Verify that distributor
cap is correctly attached to distributor. Be sure that
spark plug cables are firmly connected to the distrib­
utor cap and the spark plugs are in their correct fir­
ing order. Be sure that coil cable is firmly connected
to distributor cap and coil. Be sure that camshaft po-