Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 207
6A–15
ENGINE MECHANICAL (6VE1 3.5L)
Condition
Correction
Possible cause
Trouble in cylinder head parts
Carbon deposits in combustion
chamber
Remove carbon
Carbon deposit on valve, valve seat
and valve guide
Remove carbon
6A–16
ENGINE MECHANICAL (6VE1 3.5L)
Engine Oil Consumption Excessive
Condition
Possible cause
Correction
Oil leaking
Oil pan drain plug loose
Retighten or replace gasket
Crankcase fixing bolts loosened
Retighten
Oil pan setting bolts loosened
Retighten
Oil pan gasket broken
Replace gasket
Front cover retaining bolts loose or
gasket broken
Retighten or replace gasket
Head cover fixing bolts loose or
gasket broken
Retighten or replace gasket
Oil filter adapter cracked
Replace
Oil filter attachings bolt loose or
rubber gasket broken
Retighten or replace oil filter
Crankshaft front or rear oil seal
defective
Replace oil seal
Oil pressure unit loose or broken
Retighten or replace
Blow–by gas hose broken
Replace hose
Positive Crankcase Ventilation Valve
clogged
Clean
Engine/Transmission coupling failed
Replace oil seal
Oil leaking into combustion
chambers due to poor seal in valve
Valve stem oil seal defective
Replace
chambers due to oor seal in valve
system
Valve stem or valve guide worn
Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in cylinder
t
Cylinders and pistons worn
excessively
Replace cylinder body assembly and
pistons
parts
Piston ring gaps incorrectly
positioned
Correct
Piston rings set with wrong side up
Correct
Piston ring sticking
Replace cylinder body assembly and
pistons
Piston ring and ring groove worn
Replace pistons and others
Return ports in oil rings clogged
Clean piston and replace rings
Positive Crankcase Ventilation
System malfunctioning
Positive Crankcase Ventilation Valve
clogged
Clean
Others
Improper oil viscosity
Use oil of recommended S.A.E.
viscosity
Continuous high speed driving
and/or severe usage such as trailer
towing
Continuous high speed operation
and/or severe usage will normally
cause increased oil consumption
6A–17
ENGINE MECHANICAL (6VE1 3.5L)
Fuel Consumption Excessive
Condition
Possible cause
Correction
Trouble in fuel system
Mixture too rich or too lean due to
trouble in fuel injection system
Refer to “Abnormal Combustion”
Fuel cut function does not work
Refer to “Abnormal Combustion”
Trouble in ignition system
Misfiring or abnormal combustion
due to trouble in ignition system
Refer to “Hard Start” or “Abnormal
Combustion”
Others
Engine idle speed too high
Reset Idle Air Control Valve
Fuel system leakage
Correct or replace
Clutch slipping
Correct
Brake drag
Correct
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Excessive Exhaust Gas
Recirculation flow due to trouble in
Exhaust Gas Recirculation system
Refer to “Abnormal Combustion”
Lubrication Problems
Condition
Possible cause
Correction
Oil pressure too low
Wrong oil in use
Replace with correct engine oil
Relief valve sticking
Replace
Oil pump not operating properly
Correct or replace
Oil pump strainer clogged
Clean or replace strainer
Oil pump worn
Replace
Oil pressure gauge defective
Correct or replace
Crankshaft bearing or connecting
rod bearing worn
Replace
Oil contamination
Wrong oil in use
Replace with correct engine oil
Oil filter clogged
Replace oil filter
Cylinder head gasket damage
Replace gasket
Burned gases leaking
Replace piston and piston rings or
cylinder body assembly
Oil not reaching valve system
Oil passage in cylinder head or
cylinder body clogged
Clean or correct
Engine Oil Pressure Check
1. Check for dirt, gasoline or water in the engine oil.
a. Check the viscosity of the oil.
b. Check the viscosity of the oil.
c. Change the oil if the viscosity is outside the
specified standard.
d. Refer to the “Maintenance and Lubrication” section
of this manual.
2. Check the engine oil level.
The level should fall somewhere between the “ADD”
and the “FULL” marks on the oil level dipstick.
If the oil level does not reach the “ADD” mark on the
oil level dipstick, engine oil must be added.
3. Remove the oil pressure unit.
4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal
operating temperature (About 80
°
C).
6. Measure the oil pressure.
Oil pressure should be:
392–550 kPa (56.9–80.4 psi) at 3000 rpm.
7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure unit.
10. Start the engine and check for leaks.
6A–18
ENGINE MECHANICAL (6VE1 3.5L)
Malfunction Indicator Lamp
The instrument panel “CHECK ENGINE” Malfunction In-
dicator Lamp (MIL) illuminates by self diagnostic system
when the system checks the starting of engine, or senses
malfunctions.
Condition
Possible cause
Correction
“CHECK ENGINE” MIL does not
illuminate at the starting of engine
Bulb defective
Replace
illuminate at the starting of engine
MIL circuit open
Correct or replace
Command signal circuit to operate
self diagnostic system shorted
Correct or replace
Powertrain Control Module (PCM)
cable loosely connected,
disconnected or defective
Correct or replace
PCM defective
Replace
“CHECK ENGINE” MIL illuminates,
and stays on
Deterioration of heated oxygen
sensor internal element
Replace
Heated oxygen sensor connector
terminal improper contact
Reconnect properly
Heated oxygen sensor lead wire
shorted
Correct
Heated oxygen sensor circuit open
Correct or replace
Deterioration of engine coolant
temperature sensor internal element
Replace
Engine coolant temperature sensor
connector terminal improper contact
Reconnect properly
Engine coolant temperature sensor
lead wire shorted
Correct
Engine coolant temperature sensor
circuit open
Correct or replace
Throttle position sensor open or
shorted circuits
Correct or replace
Deterioration of crankshaft position
sensor
Replace
Crankshaft position sensor circuit
open or shorted
Correct or replace
Vehicle speed sensor circuit open
Correct or replace
Manifold absolute pressure sensor
circuit open or shorted
Correct or replace
Intake air temperature sensor circuit
open or shorted
Correct or replace
Fuel injector circuit open or shorted
Correct or replace
PCM driver transistor defective
Replace PCM
Malfunctioning of PCM RAM
(Random Access Memory) or ROM
(Read Only Memory)
Replace PCM
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