Dodge RAM 1500 1998 Owner's Manual page 1459

9 - 236 ENGINE 5.9L DIESEL
ENGINE 5.9L DIESEL (Continued)
DIAGNOSIS AND TESTING—SMOKE DIAGNOSIS CHARTS
The following charts include possible causes and cor-
rections for excess or abnormal exhaust smoke. Small
POSSIBLE CAUSE
Air filter dirty or plugged.
Air intake system restricted.
Air Leak in Intake System.
Diagnostic Trouble Codes (DTC's) active or multiple,
intermittent DTC's.
Engine Control Module (ECM) not calibrated or ECM
has incorrect calibration.
Exhaust system restriction is above specifications.
Fuel grade is not correct or fuel quality is poor.
Fuel injection pump malfunctioning.
Fuel injector malfunctioning.
Fuel return system restricted.
Intake manifold restricted.
Manifold Air Pressure (Boost) Sensor or sensor circuit
malfunctioning.
Raw fuel in intake manifold.
Turbocharger air intake restriction.
Turbocharger damaged.
Turbocharger has excess build up on compressor
wheel and/or diffuser vanes.
Turbocharger wheel clearance out of specification.
amounts of exhaust smoke (at certain times) are to be
considered normal for a diesel powered engine.
EXCESSIVE BLACK SMOKE
Check Filter Minder at air filter (Refer to 9 - ENGINE/
AIR INTAKE SYSTEM/AIR CLEANER ELEMENT -
REMOVAL).
Check entire air intake system including all hoses and
tubes for restrictions, collapsed parts or damage.
Repair/replace as necessary.
Check entire air intake system including all hoses and
tubes for cracks, loose clamps and/or holes in rubber
ducts. Also check intake manifold for loose mounting
hardware.
Refer to Powertrain Diagnostic Procedures Information.
Refer to Powertrain Diagnostic Procedures Information.
Check exhaust pipes for damage/restrictions. Repair as
necessary.
Temporarily change fuel brands and note condition.
Change brand if necessary.
A DTC may have been set. If so, refer to Powertrain
Diagnostic Procedures Information.
A DTC may have been set. Perform Cylinder Cutout
Test using DRB scan tool to isolate individual
cylinders. Also refer to Powertrain Diagnostic
Procedures Information and, to (Refer to 14 - FUEL
SYSTEM/FUEL INJECTION/FUEL INJECTOR -
DIAGNOSIS AND TESTING).
Check fuel return lines for restriction (Refer to 14 -
FUEL SYSTEM/FUEL DELIVERY - DIAGNOSIS AND
TESTING).
Remove restriction.
A DTC should have been set. Refer to Powertrain
Diagnostic Procedures Information.
Fuel injectors leaking on engine shutdown. Do Fuel
Injector Test (Refer to 14 - FUEL SYSTEM/FUEL
INJECTION/FUEL INJECTOR - DIAGNOSIS AND
TESTING).
Remove restriction.
(Refer to 11 - EXHAUST SYSTEM/TURBOCHARGER
SYSTEM/TURBOCHARGER - INSPECTION).
(Refer to 11 - EXHAUST SYSTEM/TURBOCHARGER
SYSTEM/TURBOCHARGER - CLEANING).
(Refer to 11 - EXHAUST SYSTEM/TURBOCHARGER
SYSTEM/TURBOCHARGER - INSPECTION).
CORRECTION
DR