Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE AND EMISSION CONTROL SYSTEM (G16/J20 ENGINES) 6E1-1
6E1
SECTION 6E1
ENGINE AND EMISSION CONTROL SYSTEM
(G16/J20 ENGINES)
CONTENTS
General Description ......................................6E1-3
Air Intake System Description .....................6E1-8
Fuel Delivery System Description .............6E1-10
Electronic Control System Description......6E1-11
Diagnosis.....................................................6E1-23
Diagnosis Table ........................................6E1-23
On-Vehicle Service......................................6E1-23
Engine and Emission Control System
Description ................................................6E1-23
Accelerator Cable Adjustment...................6E1-25
A/T Throttle Cable Adjustment ..................6E1-25
Idle Speed/Idle Air Control (IAC) Duty
Inspection..................................................6E1-26
Idle mixture inspection/adjustment
(vehicle without heated oxygen
sensor) ..................................................6E1-27
Air Intake System ......................................6E1-28
Throttle body ......................................... 6E1-28
Idle air control valve (IAC valve) ........... 6E1-30
Fuel Delivery System ................................ 6E1-31
Fuel pressure inspection ....................... 6E1-31
Fuel pump ............................................. 6E1-33
Fuel pressure regulator ......................... 6E1-34
Fuel injector........................................... 6E1-35
Electronic Control System......................... 6E1-39
Engine control module (ECM)/
powertrain control module (PCM) ......... 6E1-39
Mass air flow sensor (MAF sensor)....... 6E1-40
Intake air temperature (IAT) sensor ...... 6E1-41
Throttle position sensor (TP sensor) ..... 6E1-43
Engine coolant temperature sensor
(ECT sensor)......................................... 6E1-44
Heated oxygen sensor-1 and -2
(HO2S-1 and HO2S-2).......................... 6E1-45
Vehicle speed sensor (VSS) ................. 6E1-47
WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System :
• Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
• Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).
NOTE:
Whether following systems (parts) are used in the particular vehicle or not depends on specifications.
Be sure to bear this in mind when performing service work.
• EGR valve
• Heated oxygen sensor(s) or CO adjusting resistor
• Three way catalytic converter(s)
• MAP sensor
• Ignition timing adjusting resistor or CKP sensor
• Diagnosis connector