Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1675
6-12 ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE)
Engine Oil Consumption Excessive
Condition
Possible cause
Correction
Oil leaking
Oil pan drain plug loose
Retighten or replace gasket
Oil pan setting bolds loosened
Retighten
Oil pan gasket broken
Replace gasket
Front cover retaining bolts loose or
gasket broken
Retighten or replace gasket
Head cover retaining bolts loose
or gasket broken
Retighten or replace gasket
Oil filter adapter cracked
Replace
Oil filter attaching 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
Engine/Transmission coupling
area
Replace oil seal
Oil leaking into combustion
chambers due to poor seal in
valve system
Valve stem oil seal defective
Replace
Valve stem or valve guide worn
Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in
cylinder parts
Cylinders and pistons worn
excessively
Rebore cylinder and replace
pistons and others
Piston ring gaps incorrectly
positioned
Correct
Piston rings set with wrong side up
Correct
Piston rings sticking
Rebore cylinder and replace
pistons and others
Piston ring and ring groove worn
Replace pistons and others
Return ports in oil rings clogged
Clean piston and replace rings
Crank case ventilation, Positive
Crankcase Ventilation System
malfunctioning
Positive Crankcase Ventilation
Hose 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
ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE) 6-13
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 act
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 Troubleshooting
Guide
Others
Engine idle speed too high
Reset Idle Air Control Valve
Returning of accelerator control
sluggish
Correct
Fuel system leakage
Correct or replace
Clutch slipping
Correct
Brake drag
Correct
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Oil 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 new engine oil
Oil filter clogged
Replace oil filter
Cylinder head gasket damage
Replace gasket
Burned gases leaking
Replace piston and piston rings or
rebore cylinders
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. Change the oil if the viscosity is outside the
specified standard.
c. 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:
150 kPa(21.8 psi) at idle speed.
7.
Stop the engine.
8.
Remove the oil pressure gauge
9.
Install the oil pressure unit.
10.
Start the engine and check for leaks.
6-14 ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE)
Malfunction Indicator Lamp
The instrument panel "CHECK ENGINE" Malfunction
Indicator 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
MIL circuit open
Correct or replace
Command signal circuit to operate
self diagnostic system shorted
Correct or replace
Engine Control Module (ECM)
cable loosely connected,
disconnected or defective
Correct or replace
ECM defective
Replace
“CHECK ENGINE” MIL
illuminates, and stays on
Deterioration heated oxygen
sensor of internal element
Replace
Heated oxygen sensor connector
terminal improper contact
(If applicable)
Reconnect properly
Heated oxygen sensor lead wire
shorted (If applicable)
Correct
Heated oxygen sensor circuit open
(If applicable)
Correct or replace
Deterioration engine coolant
temperature sensor of 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
ECM driver transistor defective
Replace EPROM or ECM
Malfunctioning of ECM RAM
(Random Access Memory) or
Malfunctioning of ECM PROM
(Programmed Read Only Memory)
Replace EPROM or ECM
ENGINE MECHANICAL (C24SE, C22NE, 22LE, 20LE) 6A-1
SECTION 6A
ENGINE MECHANICAL
CONTENTS
PAGE
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . 6A- 4
ENGINE PICTORIAL. . . . . . . . . . . . . . . . . . . . . . . . . 6A- 6
Main Data and Specification. . . . . . . . . . . . . . . . . . . . . . ... 6A-11
CRANKCASE VENTILATION SYSTEM. . . . . . . . . . . . . . . . . ... 6A-20
ENGINE ASSEMBLY & LOOSE PARTS . . . . . . . . . . . . . . . . . . 6A-21
OPERATIONS ON ENGINE AGGREGATES. . . . . . . . . . . . . . . . . 6A-23
Engine Damping Blocks(Engine without Transmission) . . . . . . . . . . 6A-23
Toothed Belt Tension, Check . . . . . . . . . . . . . . . . . . . . . 6A-26
Toothed Belt Tension, Adjust . . . . . . . . . . . . . . . . . . . . . 6A-28
Toothed Belt, Replace . . . . . . . . . . . . . . . . . . . . . . . . 6A-29
OPERATIONS ON INSTALLED ENGINE. . . . . . . . . . . . . . . . . . . 6A-31
Gasket, Exhaust Manifold, Cylinder Head . . . . . . . . . . . . . . . . 6A-31
Gasket, Intake Manifold, Clinder Head. . . . . . . . . . . . . . . . . .. 6A-31
Seal Ring, Camshaft Housing, Timing Side. . . . . . . . . . . . . . . .. 6A-32
Seal Ring, Thermostat Housing, Cylinder Head. . . . . . . . . . . . . ... 6A-32
Seal Ring - Front Camshaft Housing, Replace. . . . . . . . . . . . . . . 6A-33
Toother Belt Rear Cover. . . . . . . . . . . . . . . . . . . . . . . . 6A-35
Toother Belt Tension Roller. . . . . . . . . . . . . . . . . . . . . ... 6A-36
COMPONENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . .. 6A-37
Cylinder Head. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6A-37
Hydraulic Valve Lifter . . . . . . . . . . . . . . . . . . . . . . . . . 6A-38
OPERATIONS ON CYLINDER HEAD AND CAMSHAFT HOUSING . . . . . . . ... 6A-39
Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6A-39
Camshaft Housing Removal and Installation . . . . . . . . . . . . . . ... 6A-40
Cylinder Head. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6A-40
Hydraulic Valve Lifers, Replace. . . . . . . . . . . . . . . . . . . . . 6A-42
Camshaft Housing, Replace . . . . . . . . . . . . . . . . . . . . . .. 6A-42
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