Index Suzuki Suzuki Grand Vitara JB416 / JB420- service repair manual
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Suzuki Grand Vitara JB416 / JB420. Manual - part 27
1A-57 Engine General Information and Diagnosis:
Excessive hydrocarbon (HC) emission or carbon monoxide (CO)
Faulty spark plug
“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord (for M16 engine)
“High-Tension Cord Removal and Installation (For M16 Engine) in Section 1H”
Faulty ignition coil with ignitor
“Ignition Coil Assembly (Including ignitor) Inspection in Section 1H”
Low compression
“Compression Check: For J20 Engine in Section 1D” or “Compression Check: For M16A Engine with VVT in Section 1D”
Lead contamination of three way catalytic converter
Check for absence of filler neck restrictor.
Faulty evaporative emission control system
“EVAP Canister Purge Inspection in Section 1B”
Fuel pressure out of specification
“Fuel Pressure Check”
Closed loop system (A/F feedback compensation) fails (Faulty TP sensor, Poor performance of ECT sensor or MAF sensor)
“Electric Throttle Body Assembly On-Vehicle Inspection in Section 1C”, “Engine Coolant Temperature (ECT) Sensor Inspection in Section 1C” or “Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection in Section 1C”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle Inspection in Section 1C”
Faulty accelerator pedal position (APP) sensor assembly
“Accelerator Pedal Position (APP) Sensor Assembly Inspection in Section 1C”
Faulty injector(s)
“Fuel Injector Circuit Check”
Faulty ECMEngine not at normal operating temperatureClogged air cleaner
“Air Cleaner Filter Inspection and Cleaning: For J20 Engine in Section 1D” or “Air Cleaner Filter Inspection and Cleaning: For M16A Engine with VVT in Section 1D”
Vacuum leaks
“Engine Vacuum Check: For J20 Engine in Section 1D” or “Engine Vacuum Check: For M16A Engine with VVT in Section 1D”
Camshaft position control (VVT) system out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A Engine with VVT in Section 1D”
Excessive nitrogen oxides (NOx) emission
Improper ignition timing
“Ignition Timing Inspection in Section 1H”
Lead contamination of catalytic converter
Faulty EGR system
“EGR System Inspection in Section 1B”
Faulty ECMCamshaft position control (VVT) system out of order (for M16 engine)
Condition
Possible cause
Correction / Reference Item