Suzuki Wagon R Plus RB310 Service Manual page 205

6-2-30 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
Condition
Excessive hydrocar-
bon (HC) emission
or carbon monox-
ide (CO)
Excessive nitrogen
oxides (NOx) emis-
sion
Possible Cause
Faulty spark plug
Leaky or disconnected high-tension cord
Faulty ignition coil with ignitor
Low compression
Lead contamination of three way catalytic
converter
Faulty evaporative emission control system
Fuel pressure out of specification
Closed loop system (A/F feed back compen-
sation) fails
• Faulty TP sensor
• Poor performance of ECT sensor or MAF
sensor
Faulty injector(s)
Faulty ECM
Engine not at normal operating temperature
Clogged air cleaner
Vacuum leaks
VVT system out of order
Improper ignition timing
Lead contamination of catalytic converter
Faulty EGR system
Fuel pressure out of specification
Closed loop system (A/F feed back compen-
sation) fails
• Faulty TP sensor
• Poor performance of ECT sensor or MAF
sensor
Faulty injector(s)
Faulty ECM
VVT system out of order
Reference Item
"Spark Plugs Inspection" in Section
6F2.
"High-tension Cords Inspection" in Sec-
tion 6F2.
"Ignition Coil Assembly (Including Igni-
tor) Inspection" in Section 6F2.
"Compression Check" in Section 6A2.
Check for absence of filler neck restric-
tor.
"Evaporative Emission Control System
Inspection" in Section 6E2.
"Table B-3 Fuel Pressure Check" in this
section.
"TP Sensor On-Vehicle Inspection" in
Section 6E2.
"ECT Sensor Inspection" or "Mass Air
Flow (MAF) and Intake Air Temperature
(IAT) Sensor Inspection" in Section
6E2.
"Table B-1 Fuel Injector Circuit Check"
in this section.
"Oil Control Valve Inspection" in Section
6E2.
"Ignition Timing Inspection" in Section
6F2.
Check for absence of filler neck restric-
tor.
"EGR Valve Inspection" in Section 6E2.
"Table B-3 Fuel Pressure Check" in this
section.
"TP Sensor On-Vehicle Inspection" in
Section 6E2.
"ECT Sensor Inspection" or "Mass Air
Flow (MAF) and Intake Air Temperature
(IAT) Sensor Inspection" in Section
6E2.
"Table B-1 Fuel Injector Circuit Check"
in this section.
"Oil Control Valve Inspection" in Section
6E2.