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) | Battery | |
| Starter signal circuit | ||
| Starter relay | ||
| Starter assembly | ||
| Park/neutral position switch assembly | ||
| VC output circuit (ECM 5 V output) | ||
| No initial combustion (Does not start) | Immobiliser system | |
| ECM power source circuit | ||
| VC output circuit (ECM 5 V output) | ||
| Crankshaft position sensor | ||
| Fuel pump control circuit | ||
| Ignition system | ||
| 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 assembly | ||
| Compression | ||
| Intake system | ||
| Throttle with motor body assembly | ||
| Cold start injector circuit | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump for high pressure | ||
| Fuel line | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| High engine speed (Poor idle) | Air conditioning signal circuit | |
| Throttle with motor body assembly | ||
| Engine coolant temperature sensor | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| PCV system | ||
| ACIS control circuit | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Throttle with motor body assembly | ||
| Intake system | ||
| ACIS control circuit | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| 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 | ||
| Ignition system | ||
| Air conditioning signal circuit | ||
| Fuel line | ||
| Valve timing | ||
| Fuel pump for low or high pressure | ||
| Intake system | ||
| ACIS control circuit | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| PCV system | ||
| Hunting (Poor idle) | PCV hose (w/ canister pump module) | |
| PCV hose (w/o canister pump module) | ||
| PCV system | ||
| Mass air flow meter | ||
| Air fuel ratio sensor | ||
| ACIS control circuit | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit (compressor circuit) | |
| ECM | ||
| Cold start injector circuit | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | |
| Fuel pump for low or high pressure | ||
| Valve timing | ||
| Mass air flow meter | ||
| Throttle with motor body assembly | ||
| Knock control sensor | ||
| Brake override system | ||
| Surging (Poor driveability) | Fuel line | |
| Fuel pump control circuit | ||
| Fuel pump for high pressure | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Engine stalls soon after starting | Mass air flow meter | |
| Intake system | ||
| Fuel line | ||
| Cold start injector circuit | ||
| Unable/difficult to refuel* | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |
| SNOW mode does not change | Pattern select switch snow mode circuit |
Tech Tips
*: w / Canister Pump Module