SFI SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
| Symptom | Suspected Area | See page |
|---|---|---|
| Engine does not crank (Does not start) | Battery | |
| Immobiliser system (w/ Entry and Start System) | ||
| Immobiliser system (w/o Entry and Start System) | ||
| 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 circuit | ||
| Ignition system | ||
| Fuel injector circuit | ||
| Valve timing | ||
| Starter signal circuit | ||
| Valve rocker arm* | - | |
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Injector | ||
| Compression | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle body | ||
| Starter signal circuit | ||
| Valve rocker arm* | - | |
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel lines | ||
| Ignition circuit | ||
| Ignition system | ||
| Fuel injector | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| Starter signal circuit | ||
| Starter pinion does not stop quickly | Starter | |
| Starter relay | ||
| High engine speed (Poor idle) | Air conditioning signal circuit (for automatic air conditioning system) | |
| Air conditioning signal circuit (for manual air conditioning system) | ||
| Throttle body | ||
| Throttle body control | - | |
| Engine coolant temperature sensor | ||
| PCV hose | ||
| PCV system | ||
| ECM power source circuit | ||
| ACIS control circuit | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Throttle body | ||
| Throttle body control | - | |
| Intake system | ||
| PCV hose | ||
| PCV system | ||
| ACIS control circuit | ||
| Engine stalls on deceleration | Idle speed (refer to "Low engine speed" symptom) | - |
| Rough idle | Compression (engine mechanical) | |
| Air fuel ratio sensor | ||
| Mass air flow meter | ||
| Ignition system | ||
| Air conditioning signal circuit (for automatic air conditioning system) | ||
| Air conditioning signal circuit (for manual air conditioning system) | ||
| Fuel line (clogged or blocked) | ||
| Fuel pump | ||
| Intake system | ||
| PCV hose | ||
| PCV system | ||
| ACIS control circuit | ||
| VALVEMATIC system | ||
| Valve rocker arm* | - | |
| Hunting (Poor idle) | PCV hose | |
| PCV system | ||
| Mass air flow meter | ||
| Air fuel ratio sensor | ||
| ACIS control circuit | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit (for automatic air conditioning system) | |
| Air conditioning signal circuit (for manual air conditioning system) | ||
| ECM | ||
| Hesitation/Poor acceleration (Poor driveability) | VALVEMATIC system | |
| Lack of power or hesitation | ||
| Fuel line | ||
| Fuel pump | ||
| Valve timing | ||
| Mass air flow meter | ||
| Throttle body | ||
| Knock sensor | ||
| Valve rocker arm* | - | |
| Brake override system | ||
| Surging (Poor driveability) | Fuel line | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Ignition system | ||
| Injector | ||
| Valve rocker arm* | - | |
| Engine stalls soon after starting | Mass air flow meter | |
| Intake system | ||
| Fuel line | ||
| VALVEMATIC system | ||
| Valve rocker arm* | - |
Tech Tips
*: Check "Fuel Cut Elps Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (more than the rpm at which fuel cut occurs +500 rpm). When this has happened, there is a possibility that the valve rocker arm will become loose and malfunction, so check that the valve rocker arm is properly attached Click here.