SFI SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
Use the table below to help determine the cause of a problem. The likely cause 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) | 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 0sec, 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.