17-1
ENGINE AND
EMISSION
CONTROL
CONTENTS
ENGINE CONTROL SYSTEM 2........
GENERAL 2...............................
Outline of Change 2.........................
EMISSION CONTROL SYSTEM
<4D5-STEPIII>
2 .....................................
GENERAL 2...............................
Outline of Changes 2........................
GENERAL INFORMATION 2................
SERVICE SPECIFICATIONS 2..............
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM 3................................EGR VALVE AND EGR COOLER 6.........
CATALYTIC CONVERTER 8................
EMISSION CONTROL SYSTEM <4M4>
9 .....................................
GENERAL 9...............................
Outline of Change 9.........................
SERVICE SPECIFICATIONS 9..............
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM 9................................
EGR VALVE AND EGR COOLER 11........
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ENGINE AND EMISSION CONTROL -EngineControlSystem/EmissionControl
System <4D5-Step III>17-2
ENGINE CONTROL SYSTEM
GENERAL
OUTLINE OF CHANGE
Electronic-controlled throttle valve system has been used instead of a conventional cable-type accelerator
mechanism <4D5>.
Its service procedure is the same as for previous models with 6G7 or 4M4 engine.
EMISSION CONTROL SYSTEM <4D5-STEP
III>
GENERAL
OUTLINE OF CHANGES
Some service procedures have been established as the following changes have been made due to the
compliance with the Emission Regulation Step III.
DAn electronic-controlled EGR valve and EGR cooler have been used.
DA catalytic converter has been added.
GENERAL INFORMATION
The electronically-controlled EGR system reduces
the level of exhaust gases (NO
x).
ItemsNameSpecification
Exhaust emission
control systemExhaust gas recirculation system
DEGR valve
DEGR solenoid valve No.1
DEGR solenoid valve No.2
DEGR valve position sensorElectronically-controlled EGR system
Single type
ON-OFF solenoid valve
ON-OFF solenoid valve
Variable resistor type
SERVICE SPECIFICATIONS
ItemsStandard value
EGR solenoid valve Nos. 1 and 2 resistance (at 20_C)Ω36 - 44
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