Tech Tips
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.
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 | |
| 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 | ||
| Ignition system | ||
| Fuel injector circuit | ||
| Valve timing | ||
| Starter signal circuit | ||
| Immobiliser system (w/ Entry and Start System) | ||
| Immobiliser system (w/o Entry and Start System) | ||
| Valve rocker arm* | - | |
| 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 body assembly | ||
| Starter signal circuit | ||
| Valve rocker arm* | - | |
| Engine difficult to start | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel lines | ||
| Ignition circuit | ||
| Ignition system | ||
| Fuel injector assembly | ||
| 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 assembly | ||
| 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 assembly | ||
| 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 | Rough idling | |
| 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 assembly | ||
| Knock sensor | ||
| Valve rocker arm* | - | |
| Brake override system | ||
| Lack of power | Lack of power | |
| Surging (Poor driveability) | Fuel line | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Valve rocker arm* | - | |
| Engine stalls soon after starting | Mass air flow meter | |
| Intake system | ||
| Fuel line | ||
| VALVEMATIC system | ||
| Engine stalls | ||
| Valve rocker arm* | - | |
| Shift solenoid valve SL (for CVT) |
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.