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) | Battery | |
| Starter signal circuit | ||
| Smart Entry and Start System (start function) | ||
| Stop and Start System | ||
| VC output circuit (ECM 5 V circuit) | ||
| No initial combustion (Does not start) | Immobiliser system | |
| 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 | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Flow chart [Engine difficult to start] | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Compression | ||
| Fuel injector assembly | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle body with motor assembly | ||
| PCV valve and hose | ||
| Starter signal circuit | ||
| ECM power source circuit | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | - | |
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Starter signal circuit | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| High engine speed | Throttle body with motor assembly | |
| Intake system | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| Low engine speed (Poor idle) | Throttle body with motor assembly | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Intake system | ||
| PCV valve and hose | ||
| Rough idle | Flow chart [Rough idling] | |
| Compression | ||
| Ignition system | ||
| Spark plug | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel line | - | |
| Throttle body with motor assembly | ||
| Intake system | ||
| Purge VSV | ||
| PCV valve and hose | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Knock control sensor | ||
| No. 1 valve rocker arm sub-assembly* | ||
| External part malfunction (Increase in load: A/C system, etc.) | - | |
| Hunting (Poor idle) | Throttle body with motor assembly | |
| Intake system | ||
| ECM power source circuit | ||
| Intake air control valve actuator (for tumble control valve) | ||
| Hesitation and/or poor acceleration (Poor driveability) | Fuel pump control circuit | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Mass air flow meter sub-assembly | ||
| Electronic throttle control system | ||
| Intake system | ||
| Compression | ||
| Brake override system | ||
| Drive start control | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Lack of power | Flow chart [Lack of power] | |
| Surging (Poor driveability) | Spark plug | |
| Fuel pump control circuit | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Mass air flow meter sub-assembly | ||
| Variable Valve Timing (VVT) system | ||
| Compression | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Engine stalls soon after starting | Flow chart [Engine stalls] | |
| Fuel pump control circuit | ||
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Variable Valve Timing (VVT) system | ||
| Throttle body with motor assembly | ||
| Intake system | ||
| PCV valve and hose | ||
| Compression | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Shift solenoid valve SL (K115 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 (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.