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) | Hybrid control system | |
| VC output circuit (ECM 5 V output) | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| VC output circuit (ECM 5 V output) | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel injector 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 | ||
| EGR valve assembly | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | - | |
| Ignition system | ||
| Fuel injector circuit | ||
| EGR valve assembly | ||
| ECM power source circuit | ||
| Crankshaft position sensor | ||
| Camshaft position sensor | ||
| Valve timing | ||
| High engine speed | Throttle with motor body assembly | |
| Intake system | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| Low engine speed (Poor idle) | Throttle with motor body assembly | |
| 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 | ||
| Manifold absolute pressure sensor | ||
| Knock control sensor | ||
| EGR valve assembly | - | |
| Hunting (Poor idle) | Electronic throttle control system | |
| Intake system | ||
| ECM power source circuit | ||
| 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 | Fuel pump control circuit | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Variable Valve Timing (VVT) system | ||
| Electronic throttle control system | ||
| Intake system | ||
| Manifold absolute pressure sensor | ||
| PCV valve and hose | ||
| Compression | ||
| EGR valve assembly | ||
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |