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 | |
| ST relay | ||
| Starter assembly | ||
| Starter signal circuit | ||
| Entry and start system (for start function) | ||
| VC output circuit (ECM 5 V output) | ||
| Park/neutral position switch assembly (for 2WD models) | ||
| Park/neutral position switch assembly (for AWD models) | ||
| No initial combustion (Does not start) | Immobiliser system | |
| ECM power source circuit | ||
| VC output circuit (ECM 5 V output) | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Crankshaft position sensor | ||
| Intake system | ||
| Valve timing | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Engine cranks normally but difficult to start | ECM power source circuit | |
| Engine difficult to start | ||
| Throttle with motor body assembly | ||
| Fuel pump (for high pressure side) | ||
| Fuel pump (for low pressure side) | ||
| Engine coolant temperature sensor | ||
| Fuel pump control circuit | ||
| Ignition system | ||
| Spark plug | ||
| Compression | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Crankshaft position sensor | ||
| Intake system | ||
| Valve timing | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Ignition system | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Crankshaft position sensor | ||
| Intake system | ||
| Valve timing | ||
| High engine speed | Throttle with motor body assembly | |
| ECM power source circuit | ||
| PCV hose | ||
| PCV system | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Throttle with motor body assembly | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Fuel pump (for high pressure side) | ||
| PCV hose | ||
| PCV system | ||
| Intake system | ||
| No. 2 turbo pressure sensor | ||
| Electric water pump assembly | ||
| Rough idle | Rough idling | |
| Throttle with motor body assembly | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Fuel pump (for high pressure side) | ||
| Ignition system | ||
| Compression | ||
| Fuel pump control circuit | ||
| Spark plug | ||
| Intake system | ||
| Valve timing | ||
| No. 1 valve rocker arm sub-assembly* | ||
| No. 2 turbo pressure sensor | ||
| Electric water pump assembly | ||
| Hunting (Poor idle) | Throttle with motor body assembly | |
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Spark plug | ||
| Intake system | ||
| Electric water pump assembly | ||
| Drive start control system | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel injector assembly (for port injection) | |
| Fuel injector assembly (for direct injection) | ||
| Fuel pump control circuit | ||
| Fuel pump (for high pressure side) | ||
| Ignition system | ||
| Spark plug | ||
| Intake system | ||
| Valve timing | ||
| No. 2 turbo pressure sensor | ||
| Vacuum regulating valve assembly | ||
| Waste gate valve | ||
| Waste gate valve actuator with bracket assembly | ||
| Air by-pass valve assembly | ||
| Compressor with bearing housing sub-assembly | ||
| Electric water pump assembly | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Brake override system | ||
| Drive start control system | ||
| Lack of power | Lack of power | |
| Vacuum regulating valve assembly | ||
| Waste gate valve | ||
| Waste gate valve actuator with bracket assembly | ||
| Air by-pass valve assembly | ||
| Compressor with bearing housing sub-assembly | ||
| Surging (Poor driveability) | Fuel pump control circuit | |
| Spark plug | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Electric water pump assembly | ||
| No. 1 valve rocker arm sub-assembly* | ||
| Engine stalls soon after starting | Engine stalls | |
| Fuel pump control circuit | ||
| Throttle with motor body assembly | ||
| Crankshaft position sensor | ||
| Ignition system | ||
| Fuel pump (for high pressure side) | ||
| Intake system | ||
| Valve timing | ||
| No. 2 turbo pressure sensor | ||
| Electric water pump assembly | ||
| Engine stalls soon after slow down | Engine stalls | |
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Throttle with motor body assembly | ||
| ECM | ||
| Crankshaft position sensor | ||
| Ignition system | ||
| Air by-pass valve assembly | ||
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |
| White smoke emitted | Turbocharger oil leak and white smoke | |
| Turbocharger noise | Turbocharger noise |
Tech Tips
*: Check "Fuel Cut Elapsed 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.