Chrysler 1991 - SERVICE DIAGNOSIS - PERFORMANCE

9 - 6 5.9L (DIESEL) ENGINES
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SERVICE DIAGFdQSIS - PERFORMANCE
CONDITION
POSSlBLi CAUSES
CORRECTION
ENGINE WILL NOT
CRANK OR CRANKS
SLOWLY
Starting motor operating, but
not cranking the engine.
Crankshaft rotation restricted.
Starting circuit connections
loose or corroded.
Neutral safety switch or starter
relay inoperative.
Battery charge low.
No voltage to starter solenoid.
Solenoid or starting motor
inoperative.
Remove the starter motor. Check for broken flywheel teeth or
a broken starting motor spring.
Rotate the engine to check for rotational resistance.
Clean and tighten connections.
Check starter relay for supply voltage and proper operation of
neutral safety. Replace defective parts.
Check battery voltage. Replace battery if a charge cannot be
held.
Check voltage to solenoid. If necessary, replace the solenoid.
Replace starter motor.
ENGINE CRANKS,
BUT WILL NOT
START—NO SMOKE
FROM EXHAUST
No fuel in supply tank.
Electrical fuel shutdown not
open.
Air intake or exhaust plugged.
Fuel filter plugged.
Injection pump not getting fuel
or fuel is aerated.
Worn or inoperative injection
pump.
Internal pump timing incorrect.
Camshaft out of time.
Fill fuel supply.
Check for loose wires and verify that the valve is functioning.
Check to be sure manual shutoff lever is in the run position.
Remove the obstruction.
Drain fuel/water separator and replace fuel filter.
Check fuel flow/bleed fuel system.
Visually check fuel delivery with an externally connected
injector to one of the pump outlets. Replace the pump if fuel
is not being delivered.
Time the pump (refer to Group 14, Fuel System).
Check/correct gear train timing alignment.
ENGINE HARD TO
START, OR WILL
NOT START—SMOKE
FROM EXHAUST
Incorrect starting procedure.
Cranking speed too slow.
Cold starting aids not working
or are needed.
Intake heater system not
working.
Insufficient intake air.
Air in the fuel system or the
fuel supply is inadequate.
The manual fuel shutoff control must be in the run position.
(a) Verify that the transmission is not engaged.
(b) Check the battery, starting motor and look for loose or
corroded wiring connections.
(c) Rotate the engine with a barring tool (Snap-On Tool SP371,
MTE No. 3377462, or equivalent) to check for internal
rotational resistance.
Verify the aids are operating. Repair/replace inoperative
parts.
Verify system is working. Repair/replace inoperative parts.
Inspect or replace filter and check for obstructions to the air
supply tube.
Check the flow through the filter and bleed the system. Locate
and eliminate the air source.
J9109-232