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) | Immobiliser system | |
| VC output circuit (ECM 5V circuit) | ||
| ECM power source circuit | ||
| Cranking holding function circuit | ||
| Entry and start system | ||
| Starter | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| VC output circuit (ECM 5 V output) | ||
| Crankshaft position sensor | ||
| Fuel pump control circuit | ||
| Fuel pump for high pressure | ||
| Ignition system | ||
| Fuel injector circuit | ||
| Valve timing | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump for high pressure | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Fuel injector for port injection | ||
| Fuel injector for direct injection | ||
| Compression | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle body | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump for high pressure | ||
| Fuel lines | ||
| Ignition system | ||
| Fuel injector for port injection | ||
| Fuel injector for direct injection | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| High engine speed (Poor idle) | Air conditioning signal circuit | |
| CAN communication system | ||
| Multiplex communication system | ||
| Throttle body | ||
| Engine coolant temperature sensor | ||
| PCV hose | ||
| PCV valve | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Fuel pump for high pressure | ||
| Throttle body | ||
| Intake system | ||
| PCV hose | ||
| PCV valve | ||
| Rough idle | Compression (engine mechanical) | |
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter | ||
| Ignition system | ||
| Air conditioning system | ||
| CAN communication system | ||
| Multiplex communication system | ||
| Fuel line (clocked) | ||
| Fuel pump for high pressure | ||
| Fuel pump | ||
| Intake system | ||
| PCV hose | ||
| PCV valve | ||
| Hunting (Poor idling) | PCV hose | |
| PCV valve | ||
| Mass air flow meter | ||
| Air fuel ratio sensor | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit (Compressor circuit) | |
| CAN communication system | ||
| Multiplex communication system | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | |
| Fuel pump for high pressure | ||
| Fuel pump | ||
| Valve timing | ||
| Mass air flow meter | ||
| Throttle body | ||
| Knock sensor | ||
| Brake override system | ||
| Surging (Poor driveability) | Fuel line | |
| Fuel pump control circuit | ||
| Fuel pump for high pressure | ||
| Ignition system | ||
| Fuel injector for port injection | ||
| Fuel injector for direct injection | ||
| Engine stalls soon after starting | Mass air flow meter | |
| Intake system | ||
| Fuel line |