| Engine does not crank (Does not start) |
Battery |
| Starter |
| Park/neutral position switch assembly |
| Clutch start switch assembly |
| Starter signal circuit |
| No initial combustion (Does not start) |
ECM power source circuit |
| Crankshaft position sensor |
| Ignition system |
| Fuel pump control circuit |
| Fuel pump |
| Fuel injector circuit |
| Valve timing |
| VC output circuit (ECM 5 V output) |
| VVT sensor (for intake side) |
| VVT sensor (for exhaust side) |
| Starter signal circuit |
| Engine immobiliser system |
| ECM |
| Engine cranks normally but difficult to start |
Fuel pump control circuit |
| Fuel pump (for high pressure) |
| Fuel injector circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| ECM power source circuit |
| Starter signal circuit |
| Engine coolant temperature sensor |
| Intake system |
| Ignition system |
| Spark plug |
| Throttle with motor body assembly |
| Compression |
| Incomplete intermittent combustion occurs (Does not start) |
Fuel pump control circuit |
| Fuel line |
| Ignition circuit |
| Ignition system |
| Fuel injector circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| ECM power source circuit |
| Starter signal circuit |
| Crankshaft position sensor |
| VVT sensor (for intake side) |
| VVT sensor (for exhaust side) |
| Valve timing |
| High engine idle speed |
Throttle with motor body assembly |
| Intake system |
| A/C signal circuit |
| ECM power source circuit |
| Engine coolant temperature sensor |
| PCV valve and hose |
| Low engine idle speed (Poor idling) |
Throttle with motor body assembly |
| A/C signal circuit |
| Fuel pump control circuit |
| Fuel pump |
| Intake system |
| PCV valve and hose |
| Rough idling |
Compression |
| Ignition system |
| Spark plug |
| Fuel injector circuit |
| ECM power source circuit |
| Fuel pump control circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| Fuel pump (for high pressure) |
| Fuel line |
| Throttle with motor body assembly |
| Intake system |
| Purge valve |
| PCV valve and hose |
| Air fuel ratio sensor |
| Heated oxygen sensor |
| Mass air flow meter |
| Knock sensor |
| Hunting (Poor idling) |
Throttle with motor body assembly |
| Intake system |
| PCV valve and hose |
| Air fuel ratio sensor |
| Mass air flow meter |
| Hesitation/poor acceleration |
Fuel pump control circuit |
| Fuel pump (for high pressure) |
| Fuel line |
| Spark plug |
| Ignition system |
| Fuel injector circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| ECM power source circuit |
| Knock sensor |
| Mass air flow meter |
| Throttle with motor body assembly |
| Intake system |
| Valve timing |
| Compression |
| Brake override system |
| Surging (Poor driveability) |
Spark plug |
| Fuel pump control circuit |
| Fuel pump (for high pressure) |
| Ignition system |
| Fuel injector circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| ECM power source circuit |
| Mass air flow meter |
| Variable Valve Timing (VVT) system |
| Compression |
| Engine stalls soon after starting |
Fuel pump control circuit |
| Fuel pump (for high pressure) |
| Spark plug |
| Ignition system |
| Fuel injector circuit |
| Fuel injector assembly (for port injection) |
| Fuel injector assembly (for direct injection) |
| ECM power source circuit |
| Mass air flow meter |
| Variable Valve Timing (VVT) system |
| Throttle with motor body assembly |
| Intake system |
| Engine immobiliser system |
| PCV valve and hose |
| Compression |
| Engine stalls only during A/C operation |
A/C signal circuit |
| ECM |
| Unable/difficult to refuel |
Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) |