Chrysler DODGE D150 1993 Service Manual page 862

MULTI-PORT FUEL INJECTION (MPI)—GENERAL DIAGNOSIS—EXCEPT DIESEL
INDEX
page
Camshaft Position Sensor Testing
. . . . . . . . . . . . 52
Charge Air Temperature Sensor Test 5 2
Coolant Temperature Sensor Test 5 2
Crankshaft Position Sensor Test 54
Diagnostic Trouble Code (DTC) 60
D R B II Scan Tool . . . . . . . . . . . . . . . . . . . . . . . . 60
Fuel Injector Test 57
Fuel Pump Pressure Test 57
Idle Air Control (IAC) Motor Test 5 5
Manifold Absolute Pressure (MAP) Sensor Test . 5 3
page
On-Board Diagnostics (OBD) 59
Oxygen ( 0
2
) Sensor Heating Element Test 54
Powertrain Control Module ( P C M ) 60-Way
Connector . 4 7
Relays—Operation/Testing 56
Starter Motor Relay Test 57
System Schematics . 47
Throttle Position Sensor (TPS) Test 54
Visual Inspection 4 3
VISUAL 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 t h a t t h e 60-way connector is fully in­
serted into the connector of t h e powertrain control
module (PCM) (Fig. 1). Verify t h a t the connector
mounting screw is tightened to 4 N # m (35 in. lbs.)
torque.
PCM
MOUNTING
BOLTS
PCM CONNECTOR
CONNECTOR MOUNTING
BOLT J9314-165
Fig. 1 Powertrain Control Module (PCM)
(2) Inspect t h e battery cable connections. Be sure
t h a t 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 t h e en­
gine compartment (Fig. 2).
TORQUE CONVERTER
CLUTCH RELAY
A / C CLUTCH RELAY STARTER RELAY
AUTO SHUTDOWN RELAY
FUEL PUMP RELAY
POWERTRAIN
DATA UNK CONTROL
CONNECTOR MODULE J9314-164
Fig. 2 Relay Location
(4) Inspect ignition coil connections. Verify t h a t
coil secondary cable is firmly connected to coil (Fig. 3
or 4).
| X
COIL
frCONNECTOR J9214-7
Fig. 3 Ignition Coil—3.9U5.2L/5.9L LDC-Gas Engine