SFI SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Engine does not crank (Does not start) | Engine immobiliser system (w/ smart key system) | |
| Battery | ||
| Starter assembly | ||
| Smart key system (for start function) (w/ smart key system) | ||
| Park/neutral position switch assembly | ||
| VC output circuit (ECM 5 V output) | ||
| Starter signal circuit | ||
| ECM power source circuit | ||
| No initial combustion (Does not start) | Engine immobiliser system (w/ smart key system) | |
| Engine immobiliser system (w/o smart key system) | ||
| VC output circuit (ECM 5 V output) | ||
| ECM power source circuit | ||
| Crankshaft position sensor | ||
| Camshaft position sensor (for intake camshaft) | ||
| Camshaft position sensor (for exhaust camshaft) | ||
| Valve timing | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel injector circuit | ||
| Starter signal circuit | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Compression | ||
| Fuel injector assembly | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle with motor body assembly | ||
| PCV valve and hose | ||
| Starter signal circuit | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | - | |
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Starter signal circuit | ||
| Crankshaft position sensor | ||
| Camshaft position sensor (for intake camshaft) | ||
| Camshaft position sensor (for exhaust camshaft) | ||
| Valve timing | ||
| High engine speed | Throttle with motor body assembly | |
| Intake system | ||
| A/C signal circuit (for automatic air conditioning system) | ||
| A/C signal circuit (for manual air conditioning system) | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| Low engine speed (Poor idle) | Throttle with motor body assembly | |
| A/C signal circuit (for automatic air conditioning system) | ||
| A/C signal circuit (for manual air conditioning system) | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Intake system | ||
| PCV valve and hose | ||
| Rough idle | Compression | |
| Ignition system | ||
| Spark plug | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel line | - | |
| Throttle with motor body assembly | ||
| Intake system | ||
| Purge VSV | ||
| PCV valve and hose | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Knock control sensor | ||
| External part malfunction (Increase in load: A/C system, etc.) | - | |
| Hunting (Poor idle) | Electronic throttle control system | |
| Intake system | ||
| ECM power source circuit | ||
| ACIS control circuit | ||
| Intake air control valve actuator (for tumble control valve) | ||
| Hesitation and/or poor acceleration (Poor driveability) | Fuel pump control circuit | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Mass air flow meter sub-assembly | ||
| Electronic throttle control system | ||
| Intake system | ||
| Compression | ||
| Brake override system | ||
| Surging (Poor driveability) | Spark plug | |
| Fuel pump control circuit | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Mass air flow meter sub-assembly | ||
| Variable Valve Timing (VVT) system | ||
| Compression | ||
| Engine stalls soon after starting | Engine immobiliser system (w/ smart key system) | |
| Engine immobiliser system (w/o smart key system) | ||
| Fuel pump control circuit | ||
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Variable Valve Timing (VVT) system | ||
| Electronic throttle control system | ||
| Intake system | ||
| PCV valve and hose | ||
| Compression | ||
| Engine stalls only during A/C operation | A/C signal circuit (for automatic air conditioning system) | |
| A/C signal circuit (for manual air conditioning system) | ||
| ECM | ||
| Engine stalls when starting off | Automatic transaxle system | |
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |