diag code DODGE TRUCK 1993 Service Service Manual

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EMISSION
CONTROL
SYSTEMS
25 - 11 • The electrical solenoid portion of the EET is not
energized.
• The engine back pressure entering the EGR valve
inlet is strong enough to close the transducer bleed
valve.
If back pressure is not strong enough to close the
transducer bleed valve, the transducer will bleed off the vacuum preventing EGR operation.
When the electrical solenoid portion of the EET is
de-energized by the powertrain control module (PCM), vacuum flows to the transducer. The trans­
ducer is connected to the engine exhaust system by a small hose that connects to the base of the EGR
valve.
The vacuum section of the transducer is controlled
by exhaust system back pressure. When back pres­ sure is high enough it will close a bleed valve in the
transducer allowing vacuum to actuate the EGR
valve. If back pressure does not close the bleed valve,
vacuum will be bled off.
For more information, refer to Group 14, Fuel Sys­

tems.
Refer to the Component Removal/Installation sec­
tion of this group for EGR valve replacement proce­
dures.

EGR SYSTEM ON-BOARD DIAGNOSTICS
(CALIFORNIA VEHICLES
ONLY)

The powertrain control module (PCM) performs an
On-Board Diagnostic (OBD) check of the EGR system
on all California vehicles. The diagnostic system uses
the electric EGR transducer (EET) for the system

tests.

The OBD check activates only during selected en­
gine/driving conditions. When the conditions are met,
the PCM energizes the EET solenoid to disable the EGR. The PCM checks for a change in the oxygen sensor signal. If the air-fuel mixture goes lean, the
PCM will attempt to enrichen the mixture. The PCM
registers a diagnostic trouble code (DTC) if the EGR system has failed or degraded. After registering a

DTC,
the PCM turns the malfunction indicator
lamp (MIL) on. (The malfunction indicator lamp was formerly referred to as the check engine lamp). The
malfunction indicator lamp indicates the need for im­
mediate service.
If a malfunction is indicated by the malfunction in­
dicator lamp and a DTC for the EGR system was set,
check for proper operation of EGR system. Use the
following: System Test, EGR Gas Flow Test and EGR
Diagnosis Chart.
If the EGR system tests properly, check the system
using the DRB II scan tool. For use of the DRB II,
refer to the appropriate Powertrain Diagnostics Pro­ cedure service manual. EGR SYSTEM SERVICE
A malfunctioning EGR system can cause engine
spark knock, sags or hesitation, rough idle, engine
stalling and poor driveability. To be sure of proper
operation of the EGR system, inspect all passages for
blockage. Check moving parts for binding. Inspect
the complete system for leaks. Replace system com­ ponents or hoses that are leaking.
Inspect all hose connections between throttle body,
intake manifold, EGR valve and EGR purge solenoid.
Replace any vacuum harness components that are
leaking or damaged. Refer to EGR Control System Test and EGR Gas
Flow Test to check EGR System operation.
EGR GAS FLOW TEST (1) Disconnect hose from EGR valve and connect a
hand vacuum pump to EGR valve nipple. Apply a
minimum of 12 inches vacuum the valve.
(2) The engine should now idle roughly or stall. If
this occurs, the valve is performing correctly. Proceed
to Electric EGR Transducer Test.
(3) If the engine idle speed did not change, remove
the EGR valve and inspect the valve and the exhaust passage in the manifold for blockage. Repair as nec­
essary. If blockage is not present, replace the EGR
valve.
ELECTRIC EGR TRANSDUCER (EET)

TESTING ELECTRIC SOLENOID PORTION OF TRANSDUCER
(1) Bring the engine to normal operating tempera­

ture.
Operate at idle speed. Test the EET as follows: (2) Check vacuum at EET vacuum source. Discon­
nect the hose and attach a vacuum gauge to it.
(3) Vacuum should be a minimum of 15 inches:
• If vacuum is low, check the line for kinks, twists
or a loose connection at vacuum connector or intake
manifold.
• If vacuum is correct, remove gauge. Connect the
vacuum line and proceed to next step. (4) Check EET operation using the appropriate
Powertrain Diagnostic Procedures service manual.
Refer to this manual for use of the DRB II scan tool and repair EET as necessary.

TESTING VACUUM PORTION
OF
TRANSDUCER
(1) Disconnect the EET vacuum lines, back pres­
sure line and electrical connector. Remove trans­
ducer.
(2) Plug the EET EGR valve port.
(3) Apply 1-2 pounds air pressure to exhaust back
pressure port. Air pressure can be supplied with a
hand operated air pump or compressed air (regulated
to correct psi).
(4) Apply a minimum of 12 inches of vacuum to
vacuum supply port.
Replace the EET if it will not hold vacuum.

COMPONENT AND SYSTEM INDEX

Name
Group-page

AUDIO
SYSTEMS
8F-1
SERVICE
PROCEDURES 8F-7
TEST PROCEDURES 8F-2
BATTERY/STARTER/GENERATOR SERVICE 8B-1 BATTERY SERVICE PROCEDURES 8B-1
GENERATOR SERVICE 8B-6
SPECIFICATIONS 8B-9
STARTER SERVICE PROCEDURES 8B-4
BODY COMPONENTS 23-1 CAB/BODY INTERIOR COMPONENTS
23-35

DOORS
23-21
EXTERIOR COMPONENTS 23-1
FIXED GLASS
23-29
PAINT
CODE CHART
23-54

REFINISHING PROCEDURES
23-54

BRAKES
5-1 BENDIX DISC BRAKE 5-37 BRAKE ADJUSTMENTS-BRAKE BLEEDING 5-7
BRAKE DIAGNOSIS 5-3

CHRYSLER
DISC BRAKE 5-27 DRUM BRAKES—ELEVEN INCH 5-46
DRUM BRAKES-TWELVE INCH 5-50
GENERAL INFORMATION 5-1 MASTER CYLINDER—COMBINATION VALVE-BRAKE
LINES 5-10
PARKING BRAKES 5-56
POWER BRAKE BOOSTER-BRAKE PEDAL 5-20 POWER BRAKE VACUUM PUMP-DIESEL ENGINE. . 5-22

REAR
WHEEL ANTILOCK
(RWAL)
BRAKES 5-59
SPECIFICATIONS 5-65
CHIME/BUZZER WARNING
SYSTEMS
8U-1
CLUTCH 6-1 CLUTCH DIAGNOSIS 6-2 CLUTCH SERVICE 6-11
COOLING SYSTEM 7-1
DIAGNOSIS 7-4
ENGINE ACCESSORY DRIVE BELTS 7-40
ENGINE BLOCK HEATERS 7-48

SERVICE
PROCEDURES 7-15 SPECIFICATIONS 7-49
ELECTRICAL 8A-1 BATTERY TEST PROCEDURES 8A-2
ENGINE STARTER MOTOR TEST PROCEDURES.... 8A-9
GENERAL INFORMATION 8A-1
GENERATOR TEST PROCEDURES ON VEHICLE . . . 8A-13
GROUP INDEX 8A-1
SPECIFICATIONS 8A-18
BATTERY/STARTING/CHARGING
SYSTEMS
DIAGNOSTICS 8A-1

EMISSION
CONTROL
SYSTEMS.
25-1 AIR INJECTION SYSTEM—5.9L HDC-GAS ENGINE . 25-15 COMPONENT REMOVAL/INSTALLATION 25-17 EVAPORATIVE EMISSION CONTROLS 25-6
EXHAUST EMISSION CONTROLS 25-10
GENERAL INFORMATION 25-1
ENGINES 9-1 3.9L ENGINE SERVICE PROCEDURES 9-17 5.2L ENGINE SERVICE PROCEDURES 9-47
5.9L (DIESEL) ENGINE SERVICE PROCEDURES . . . 9-107
Name
Group-page

5.9L ENGINE SERVICE PROCEDURES 9-77 ENGINE DIAGNOSIS 9-5
STANDARD SERVICE PROCEDURES 9-1
EXHAUST SYSTEM AND INTAKE MANIFOLD 11-1
EXHAUST SYSTEM DIAGNOSIS 11-3
GENERAL INFORMATION 11-1

SERVICE
PROCEDURES (DIESEL ENGINES) 11-17

SERVICE
PROCEDURES (GASOLINE ENGINES) 11-4
SPECIFICATIONS 11-27
FRAME AND BUMPERS 13-1 ATTACHED COMPONENTS 13-30
BUMPERS
13-1
FRAME 13-20
SNOW PLOW 13-3
FRONT SUSPENSION AND AXLE 2-1 FRONT SUSPENSION—2WD VEHICLES 2-7
FRONT SUSPENSION—4WD VEHICLES 2-14 FRONT WHEEL ALIGNMENT 2-3
GENERAL INFORMATION 2-1 MODEL 44 FRONT AXLE 2-17
MODEL 60 FRONT AXLE 2-49
TORQUE SPECIFICATIONS 2-75
FUEL SYSTEM 14-1 ACCELERATOR PEDAL AND THROTTLE CABLE . . . 14-25
DIESEL
FUEL INJECTION—COMPONENT DESCRIPTION/SYSTEM OPERATION 14-76

DIESEL
FUEL INJECTION-GENERAL DIAGNOSIS. . 14-88

DIESEL
FUEL INJECTION-SERVICE
PROCEDURES
14-106

FUEL DELIVERY SYSTEM-EXCEPT DIESEL 14-3
FUEL DELIVERY-DIESEL ENGINE 14-15 FUEL TANKS 14-20
GENERAL INFORMATION 14-1 MULTI-PORT FUEL INJECTION (MPI)-COMPONENT DESCRIPTION/SYSTEM OPERATION-EXCEPT
DIESEL
14-29
MULTI-PORT FUEL INJECTION
(MPlj-COMPONENT
REMOVAL/INSTALLATION-EXCEPT DIESEL .... 14-64
MULTI-PORT FUEL INJECTION (MPI)—GENERAL DIAGNOSIS-EXCEPT DIESEL 14-43

SERVICE
ADJUSTMENTS-DIESEL
14-122
SPECIFICATIONS
14-123

HEATING AND AIR CONDITIONING 24-1 CLIMATE CONTROL SYSTEM
24-29

COMPRESSOR
SERVICE
(SD-709)
24-21 DIAGNOSTIC PROCEDURES 24-3
GENERAL INFORMATION 24-1 REFRIGERANT SYSTEM SERVICE PROCEDURES . . 24-17
TORQUE SPECIFICATIONS
24-39

HORNS 8G-1
SERVICE
PROCEDURES 8G-3
TEST PROCEDURES 8G-1

IGNITION
SYSTEMS
8D-1 COMPONENT IDENTIFICATION/SYSTEM OPERATION. 8D-1
COMPONENT REMOVAL/INSTALLATION 8D-18 DIAGNOSTICS/SERVICE PROCEDURES 8D-7
IGNITION
SWITCH
8D-25

SPECIFICATIONS
8D-28

INSTRUMENT PANEL AND GAUGES 8E-1

CLUSTER
AND
GAUGE SERVICE PROCEDURES
. . . 8E-12

CLUSTER
AND
GAUGE TEST PROCEDURES
8E-5

GENERAL INFORMATION
8E-1

MESSAGE
CENTER-DIESEL ENGINE
8E-4

MESSAGE
CENTER-GAS ENGINE
8E-3

SWITCH
AND
PANEL COMPONENT SERVICE
8E-16

INTRODUCTION
lntro.-1
DESIGNATIONS, LABELS/PLATES/DECALS, CODES AND DIMENSIONS/WEIGHTS
Intro.-1

MEASUREMENT
AND
TORQUE SPECIFICATIONS
lntro.-11

LAMPS
8L-1
BULB APPLICATION
8L-11

EXTERIOR LAMPS
8L-1

EXTERIOR LAMPS SERVICE PROCEDURES
8L-3
INTERIOR LAMPS
8L-10

LUBRICATION
AND
MAINTENANCE
0-1
CHASSIS
AND
BODY
0-28
DRIVETRAIN
0-22

ENGINE MAINTENANCE
0-14

GENERAL INFORMATION
0-1

POWER DOOR LOCKS
8P-1
SERVICE
PROCEDURES
8P-2

TEST PROCEDURES
8P-1

POWER MIRRORS
8T-1
SERVICE
PROCEDURES
8T-2

TEST PROCEDURES
8T-1

POWER WINDOWS
8S-1
SERVICE
PROCEDURES
8S-3

TEST PROCEDURES
8S-1

PROPELLER SHAFTS
16-1
GENERAL INFORMATION
16-1
PROPELLER SHAFT REPLACEMENT
16-8

SERVICE
DIAGNOSIS/PROCEDURES
16-3

TORQUE SPECIFICATIONS
16-15
UNIVERSAL
JOINT
REPLACEMENT
16-10

REAR
SUSPENSION
AND
AXLE
3-1
8
3/8 and 9 1/4
AXLE
3-11

GENERAL INFORMATION
3-1

MODEL
60 and 70
AXLES
3-29

POWER-LOK DIFFERENTIAL
3-55

REAR
SUSPENSION—2WD
and 4WD
VEHICLES
.... 3-3

SERVICE
DIAGNOSIS
3-6

SPECIFICATIONS
3-27

SURE-GRIP
DIFFERENTIAL SERVICE
3-28

TORQUE SPECIFICATIONS
3-59

TRAC-LOK DIFFERENTIAL
3-51

REAR
WINDOW DEFOGGER
8N-1
REPAIR PROCEDURES (GRID LINES, TERMINALS,
AND PIGTAILS)
8N-3

SERVICE
PROCEDURES
8N-4

TEST PROCEDURES
8N-1

STEERING
19-1
GENERAL INFORMATION
19-1
POWER STEERING PUMP
19-11
POWER STEERING SYSTEM DIAGNOSIS
19-2

RECIRCULATING BALL POWER STEERING GEAR
. . 19-20

STEERING COLUMN
19-35

STEERING LINKAGE
19-17

TORQUE SPECIFICATIONS
19-40

TRANSMISSION
AND
TRANSFER CASE
21-1

AUTOMATIC TRANSMISSION DIAGNOSIS
AND

TESTING
21-85

AUTOMATIC TRANSMISSION REMOVAL
AND
INSTALLATION
21-142

AUTOMATIC TRANSMISSION—32RH/36RH/37RH/
42RH/46RH
21-73

G360
MANUAL TRANSMISSION
21-46

G360
TRANSMISSION OVERHAUL
21-53

GENERAL INFORMATION-32RH/36RH/37RH
21-73

GENERAL INFORMATION—42RH/46RH
. . . 21-78

IN-VEHICLE SERVICE—32RH/36RH/37RH/ 42RH/46RH
21-130

NP205
TRANSFER CASE
21-342

NP241
TRANSFER CASE
21-350
NV4500
MANUAL TRANSMISSION
21-1

NV4500
TRANSMISSION OVERHAUL
21-6

OVERDRIVE
UNIT
OVERHAUL—42RH/46RH
21-324

TRANSMISSION OVERHAUL—32RH
21-152

TRANSMISSION OVERHAUL—36RH/37RH
21-192
TRANSMISSION OVERHAUL—42RH
21-233

TRANSMISSION OVERHAUL—46RH
21-278

TRANSMISSION/TRANSFER CASE SPECIFICATIONS
21-364

TURN SIGNALS
AND
HAZARD WARNING FLASHER
. . . 8J-1
GENERAL INFORMATION
8J-1
MULTIFUNCTION SWITCH SERVICE PROCEDURES.
. 8J-3

MULTIFUNCTION SWITCH TESTING PROCEDURES.
. 8J-2

VEHICLE
SPEED
CONTROL SYSTEM
8H-1
SERVICE
PROCEDURES
8H-11

TEST PROCEDURES
8H-7

WHEELS
AND
TIRES
22-1
TIRES
22-1

TORQUE SPECIFICATIONS
22-13
VEHICLE VIBRATION
22-11
WHEELS
22-6

WINDSHIELD WIPER
AND
WASHER
SYSTEMS
8K-1
INTERMITTENT WINDSHIELD WIPER FUNCTION
AND
SWITCH TESTING PROCEDURES
8K-6

TWO
SPEED
WINDSHIELD WIPER MOTOR
AND
SWITCH TESTING PROCEDURES
8K-1

WINDSHIELD WASHERS
8K-10

WINDSHIELD WIPER SYSTEM SERVICE
PROCEDURES
8K-7

WIRING DIAGRAMS
8W-1
COMPONENT IDENTIFICATION
8W-9

GENERAL INFORMATION
8W-1

SPLICE
LOCATIONS
8W-29

WIRING DIAGRAMS AD-BODY
8W-37