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 | |
| Starter assembly*1 | ||
| Starter assembly*2 | ||
| Park/neutral position switch assembly*1 | ||
| Clutch start switch assembly (for RHD)*2 | ||
| Clutch start switch assembly (for LHD)*2 | ||
| Starter signal circuit | ||
| VC output circuit (ECM 5 V output) | ||
| 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*3 | ||
| Engine immobiliser system*4 | ||
| 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 (for Automatic Air Conditioning System) | ||
| A/C signal circuit (for Manual Air Conditioning System) | ||
| 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 (for Automatic Air Conditioning System) | ||
| A/C signal circuit (for Manual Air Conditioning System) | ||
| 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 | ||
| Engine immobiliser system*3 | ||
| Engine immobiliser system*4 | ||
| Intake system | ||
| PCV valve and hose | ||
| Compression | ||
| Engine stalls only during A/C operation | A/C signal circuit (for Automatic Air Conditioning System) | |
| A/C signal circuit (for Manual Air Conditioning System) | ||
| ECM | ||
| MIL malfunction | MIL circuit | |
| Meter / gauge system | ||
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |
*1: for Automatic Transmission
*2: for Manual Transmission
*3: w/ Entry and Start System
*4: w/o Entry and Start System