Suzuki Grand Vitara Service Manual page 62

1A-55 Engine General Information and Diagnosis:
Condition
Improper engine idling or
engine fails to idle
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Possible cause
Faulty spark plug
Leaky or disconnected high-tension cord
(for M16 engine)
Faulty ignition coil with ignitor
Fuel pressure out of specification
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve
Faulty evaporative emission control
system
Faulty EGR system
Faulty fuel injector(s)
Poor performance of ECT sensor or
MAF sensor
Faulty electric throttle body assembly
Faulty accelerator pedal position (APP)
sensor assembly
Faulty ECM
Loose connection or disconnection of
vacuum hoses
Malfunctioning PCV valve
Engine overheating
Low compression
Camshaft position control (VVT) system
out of order (for M16 engine)
Faulty electric load parts (headlight,
blower motor and/or rear defogger)
Faulty electric load current sensor (for
J20 engine)
Faulty generator and/or its circuit
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Correction / Reference Item
"Spark Plug Inspection: in Section 1H"
"High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H"
"Ignition Coil Assembly (Including ignitor)
Inspection: in Section 1H"
"Fuel Pressure Check: "
"EGR Valve Inspection: in Section 1B"
"EVAP Canister Purge Inspection: in Section
1B"
"EGR System Inspection: in Section 1B"
"Fuel Injector Circuit Check: "
"Engine Coolant Temperature (ECT) Sensor
Inspection: in Section 1C" or "Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection: in Section 1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection: in Section 1C"
"PCV Valve Inspection: in Section 1B"
Condition "Engine overheating"
"Compression Check: For J20 Engine in
Section 1D" or "Compression Check: For
M16A Engine with VVT in Section 1D"
"Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D"
"Electric Load Signal Circuit Check: "
"Electric Load Current Sensor On-Vehicle
Inspection (For J20 Engine): in Section 1C"
"DTC P0620: Generator Control Circuit: " and
"DTC P0625 / P0626: Generator Field
Terminal Circuit Low / High: "