Engine Symptom Diagnosis
SYMPTOM CHART
| Condition | Possible Cause | Action |
|---|---|---|
| Hard starting (but cranks OK) | Faulty spark plug | Spark Plug Inspection |
| Faulty ignition coil | Ignition Coil Assembly (Igniter and Ignition Coil) Inspection | |
| Idle air control system malfunction | IDLE AIR CONTROL (IAC) SYSTEM CHECK | |
| Faulty ECT sensor | Engine Coolant Temperature (ECT) Sensor Inspection | |
| Faulty TP sensor | Throttle Position (TP) Sensor On-Vehicle Inspection | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION | |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| Faulty CKP sensor | Crankshaft Position (CKP) Sensor Inspection | |
| Low engine compression | Compression Check | |
| PCV valve malfunction | PCV Valve Inspection | |
| Engine stall - During A/C operation | A/C signal circuit A/C | Signal Circuits Check (Vehicle with A/C) |
| Engine stall - During P/S wheel turned | Power steering pressure switch circuit | POWER STEERING PRESSURE (PSP) SWITCH SIGNAL CIRCUIT CHECK |
| Rough or incorrect idle - Rough idle | Faulty spark plug | Spark Plug Inspection |
| Faulty ignition coil | Ignition Coil Assembly (Igniter and Ignition Coil) Inspection | |
| Idle air control system malfunction | IDLE AIR CONTROL (IAC) SYSTEM CHECK | |
| Faulty ECT sensor | Engine Coolant Temperature (ECT) Sensor Inspection | |
| Faulty TP sensor | Throttle Position (TP) Sensor On-Vehicle Inspection | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION | |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| EGR system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| EVAP control system malfunction | EVAP Canister Purge Valve Inspection | |
| PCV valve malfunction | PCV Valve Inspection | |
| Low engine compression | Compression Check | |
| Engine cooling system malfunction (Overheating / overcooling) | Condition: Overheating / Condition: Overcooling . | |
| Rough or incorrect idle - Momentary rough idle when P/S wheel is turned | Power steering pressure switch circuit | POWER STEERING PRESSURE (PSP) SWITCH SIGNAL CIRCUIT CHECK |
| Hesitation / poor acceleration | Faulty spark plug | Spark Plug Inspection |
| Faulty ignition coil | Ignition Coil Assembly (Igniter and Ignition Coil) Inspection | |
| Faulty ECT sensor | Engine Coolant Temperature (ECT) Sensor Inspection | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION | |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| TP sensor malfunction | Throttle Position (TP) Sensor On-Vehicle Inspection | |
| EGR system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| Low engine compression | Compression Check | |
| Engine cooling system malfunction (Overheating / overcooling) | Condition: Overheating / Condition: Overcooling . | |
| Brake (Dragging brake) | Condition "Dragging brake" in Brakes Symptom Diagnosis | |
| Clutch (Slipping clutch) | Condition "Slippingclutch" in Clutch System Symptom Diagnosis | |
| Surge | Faulty spark plug | Spark Plug Inspection |
| Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION | |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| EGR system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| EVAP control system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| Low engine compression | Compression Check | |
| Detonation / spark knock | Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| EGR system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| Excessive carbon deposit in combustion chamber | Clean . | |
| Engine overheating | Condition: Overheating . | |
| Faulty spark plug | Spark Plug Inspection | |
| Improper ignition timing | Ignition Timing Inspection and Adjustment | |
| Faulty ECT sensor | Engine Coolant Temperature (ECT) Sensor Inspection | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| Excessive fuel consumption | Faulty spark plug | Spark Plug Inspection |
| Improper ignition timing | Ignition Timing Inspection and Adjustment | |
| Faulty ECT sensor | Engine Coolant Temperature (ECT) Sensor Inspection | |
| Faulty MAF sensor | Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor Inspection | |
| EGR system malfunction | EGR System Inspection (Using SUZUKI Scan Tool) | |
| TP sensor malfunction | Throttle Position (TP) Sensor On-Vehicle Inspection | |
| Fuel injector(s) malfunction | FUEL INJECTOR INSPECTION | |
| Fuel pressure out of specification | FUEL PRESSURE CHECK | |
| Low engine compression | Compression Check | |
| Brake (Dragging brake) | Condition: "Dragging brake" in Brakes Symptom Diagnosis | |
| Clutch (Slipping clutch) | Condition: "Slipping clutch" in Clutch System Symptom Diagnosis | |
| Engine low compression | Poor spark plug tightening or faulty gasket | Spark Plug Removal and Installation, Spark Plug Inspection |
| Compression leak from valve seat | Valves and Cylinder Head Inspection | |
| Sticky valve stem | Valves and Cylinder Head Inspection | |
| Weak or damaged valve springs | Valves and Cylinder Head Inspection | |
| Compression leak at cylinder head gasket | Replace . | |
| Sticking or damaged piston ring | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning | |
| Worn piston, ring or cylinder | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning | |
| Engine overheating | Improper engine oil grade | Engine Oil and Filter Change |
| Clogged oil filter or oil strainer | Oil Pressure Check | |
| Poor oil pump performance | Oil Pressure Check | |
| Blown cylinder head gasket | Replace . | |
| Loose or broken drive belt | Drive Belt Inspection | |
| Not enough coolant | Coolant Level Check | |
| Faulty thermostat | Thermostat Inspection | |
| Faulty water pump | Water Pump Inspection | |
| Dirty or bent radiator fins | Radiator On-Vehicle Inspection and Cleaning | |
| Coolant leakage on cooling system | ||
| Defective cooling fan motor | ||
| Faulty radiator fan control system | RADIATOR FAN CONTROL SYSTEM CHECK | |
| Plugged radiator | Radiator On-Vehicle Inspection and Cleaning | |
| Faulty radiator cap | Replace . | |
| Excessive engine oil consumption - Oil leakage | Blown cylinder head gasket | Replace . |
| Leaky camshaft oil seals | Replace . | |
| Excessive engine oil consumption - Oil entering combustion chamber | Sticky piston ring | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning |
| Worn piston and cylinder | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning | |
| Worn piston ring groove and ring | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning | |
| Improper location of piston ring gap | Pistons, Piston Rings, Connecting Rods and Cylinders Disassembly and Assembly | |
| Worn or damaged valve stem seal | Replace . | |
| Worn valve stem | Valves and Cylinder Head Inspection | |
| Low engine oil pressure | Improper oil viscosity | Engine Oil and Filter Change |
| Malfunctioning oil pressure switch | Oil Pressure Switch On-Vehicle Inspection | |
| Clogged oil strainer | Oil Pan and Oil Pump Strainer Cleaning | |
| Functional deterioration of oil pump | Oil Pump Inspection | |
| Worn oil pump relief valve | Oil Pump Inspection | |
| Excessive clearance in various sliding parts | ||
| Engine noise - Valve noise
NOTE:
Before checking mechanical noise, make sure that: Specified spark plug is used. Specified fuel is used.
|
Faulty hydraulic valve lash adjuster | Camshaft and Valve Lash Adjuster Inspection |
| Worn valve stem and guide | Valves and Cylinder Head Inspection | |
| Weak or broken valve spring | Valves and Cylinder Head Inspection | |
| Warped or bent valve | Valves and Cylinder Head Inspection | |
| Engine noise - Piston, ring and cylinder noise
NOTE:
Before checking mechanical noise, make sure that: Specified spark plug is used. Specified fuel is used.
|
Worn piston, ring and cylinder bore | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning |
| Engine noise - Connecting rod noise
NOTE:
Before checking mechanical noise, make sure that: Specified spark plug is used. Specified fuel is used.
|
Worn rod bearing | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning |
| Worn crank pin | Pistons, Piston Rings, Connecting Rods and Cylinders Inspection and Cleaning | |
| Loose connecting rod nuts | Pistons, Piston Rings, Connecting Rods and Cylinders Removal and Installation | |
| Improper oil viscosity | Engine Oil and Filter Change | |
| Malfunctioning oil pressure switch | Oil Pressure Switch On-Vehicle Inspection | |
| Clogged oil strainer | Oil Pan and Oil Pump Strainer Cleaning | |
| Functional deterioration of oil pump | Oil Pump Inspection | |
| Worn oil pump relief valve | Oil Pump Inspection | |
| Excessive clearance in various sliding parts | ||
| Engine noise - Crankshaft noise
NOTE:
Before checking mechanical noise, make sure that: Specified spark plug is used. Specified fuel is used.
|
Improper oil viscosity | Engine Oil and Filter Change |
| Malfunctioning oil pressure switch | Oil Pressure Switch On-Vehicle Inspection | |
| Clogged oil strainer | Oil Pan and Oil Pump Strainer Cleaning | |
| Functional deterioration of oil pump | Oil Pump Inspection | |
| Worn oil pump relief valve | Oil Pump Inspection | |
| Excessive clearance in various sliding parts | ||
| Worn bearing | Main Bearings, Crankshaft and Cylinder Block Inspection | |
| Worn crankshaft journal | Main Bearings, Crankshaft and Cylinder Block Inspection | |
| Loose bearing cap bolts | Main Bearings, Crankshaft and Cylinder Block Removal and Installation | |
| Excessive crankshaft thrust play | Main Bearings, Crankshaft and Cylinder Block Inspection | |
| Engine overcooling | Thermostat malfunction | Thermostat Inspection |
| Faulty radiator fan control system | RADIATOR FAN CONTROL SYSTEM CHECK |