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 | Link |
|---|---|---|
| Engine does not crank (Does not start) | Smart entry and start system (for Start function) | |
| Battery | ||
| VC output circuit (ECM 5 V output) | ||
| Starter signal circuit | ||
| Starter assembly | ||
| No initial combustion (Does not start) | Immobiliser system | |
| ECM power source circuit | ||
| VC output circuit (ECM 5 V output) | ||
| Crankshaft position sensor | ||
| VVT sensor (for intake camshaft) | ||
| VVT sensor (for exhaust camshaft) | ||
| Ignition system | ||
| Fuel injector circuit | ||
| Valve timing | ||
| Starter signal circuit | ||
| Fuel pump control circuit | ||
| ECM | ||
| Engine cranks normally but difficult to start | Flow chart [Engine difficult to start] | |
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Compression | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle body with motor assembly | ||
| ECM power source circuit | ||
| Starter signal circuit | ||
| Fuel pump control circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel line | - |
| Ignition system | ||
| Fuel injector assembly | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| Fuel pump control circuit | ||
| High engine speed | Air conditioning signal circuit | |
| Throttle body with motor assembly | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| ECM power source circuit | ||
| Drive start control system | ||
| Low engine speed (Poor idle) | Throttle body with motor assembly | |
| Intake system | ||
| PCV valve and hose | ||
| Fuel pump control circuit | ||
| Engine stalls on deceleration | Flow chart [Engine stalls] | |
| Idle speed (refer to "Low engine speed" symptom) | - | |
| Rough idle | Flow chart [Rough idling] | |
| Compression (engine mechanical) | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Ignition system | ||
| Air conditioning signal circuit | ||
| Fuel line | - | |
| Valve timing | ||
| Intake system | ||
| PCV valve and hose | ||
| Fuel pump control circuit | ||
| External part malfunction (Increase in load: A/C system, A/T system, etc.) | - | |
| Hunting (Poor idle) | PCV valve and hose | |
| Mass air flow meter sub-assembly | ||
| Air fuel ratio sensor | ||
| Lack of power | Flow chart [Lack of power] | |
| Brake override system | ||
| Drive start control system | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit | |
| ECM | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | - |
| Valve timing | ||
| Mass air flow meter sub-assembly | ||
| Throttle body with motor assembly | ||
| Knock control sensor | ||
| Fuel pump control circuit | ||
| Brake override system | ||
| Drive start control system | ||
| Surging (Poor driveability) | Fuel line | - |
| Ignition system | ||
| Fuel injector assembly | ||
| Fuel pump control circuit | ||
| Engine stalls soon after starting | Flow chart [Engine stalls] | |
| Mass air flow meter sub-assembly | ||
| Intake system | ||
| Fuel line | - |