SFI SYSTEM (w/o EGR 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 | ||
| Fuel pump control circuit | ||
| Ignition system | ||
| Fuel injector circuit | ||
| Valve timing | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Compression | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle with motor body assembly | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | - | |
| Ignition system | ||
| Fuel injector assembly | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| High engine speed (Poor idle) | Throttle with motor body assembly | |
| Throttle with motor body assembly control | - | |
| Engine coolant temperature sensor | ||
| PCV hose | ||
| PCV system | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Throttle with motor body assembly | ||
| Throttle with motor body assembly control | - | |
| Intake system | ||
| PCV hose | ||
| PCV system | ||
| Engine stalls on deceleration | Idle speed (refer to "Low engine speed") | |
| Rough idle | Compression (engine mechanical) | |
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Ignition system | ||
| Fuel line | - | |
| Valve timing | ||
| Fuel pump | ||
| Intake system | ||
| PCV hose | ||
| PCV system | ||
| Hunting (Poor idle) | PCV hose | |
| PCV system | ||
| Mass air flow meter sub-assembly | ||
| Air fuel ratio sensor | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | - |
| Fuel pump | ||
| Valve timing | ||
| Mass air flow meter sub-assembly | ||
| Throttle with motor body assembly | ||
| Knock control sensor | ||
| Surging (Poor driveability) | Fuel line | - |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Engine stalls soon after starting | Mass air flow meter sub-assembly | |
| Intake system | ||
| Fuel line | - |