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 relay | ||
| Starter assembly | ||
| Entry and start system (for start function) (w/ entry and start system) | ||
| Park/neutral position switch assembly | ||
| VC output circuit (ECM 5 V circuit) | ||
| Engine stop and start system | ||
| Starter signal circuit (w/o entry and start system) |
||
| Cranking holding function circuit (w/ entry and start system) |
||
| No initial combustion (does not start) | Engine immobiliser system (w/ entry and start system) |
|
| ECM power source circuit | ||
| VC output circuit (ECM 5 V output) | ||
| Crank position sensor | - | |
| Cam position sensor | - | |
| Valve timing | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel injector circuit | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump | ||
| Engine coolant temperature sensor | ||
| EGR valve assembly | ||
| Ignition system | ||
| Compression | ||
| Crank position sensor | - | |
| Fuel injector assembly | ||
| Fuel injector circuit | ||
| Knock control sensor | ||
| Intake system | ||
| Throttle with motor body assembly | ||
| PCV valve and hose | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel lines | - | |
| Ignition system | ||
| Fuel injector circuit | ||
| Crank position sensor | - | |
| Valve timing | ||
| High engine speed | Throttle with motor body assembly | |
| Intake system | ||
| Air conditioning signal circuit (for automatic air conditioning system) | ||
| Air conditioning signal circuit (for manual air conditioning system) | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| Low engine speed (poor idle) | Throttle with motor body assembly | |
| Air conditioning signal circuit (for automatic air conditioning system) | ||
| Air conditioning signal circuit (for manual air conditioning system) | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Intake system | ||
| PCV valve and hose | ||
| Engine stalls on deceleration | Idle speed (refer to "Low engine speed" symptom) | - |
| Rough idle | Compression | |
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel lines | - | |
| Throttle with motor body assembly | ||
| Intake system | ||
| Purge VSV | ||
| PCV valve and hose | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| EGR valve assembly | ||
| Mass air flow meter sub-assembly | ||
| External part malfunction (Increase in load: A/C system, etc.) | - | |
| Hunting (poor idle) | Throttle with motor body assembly | |
| Intake system | ||
| PCV valve and hose | ||
| Air fuel ratio sensor | ||
| Mass air flow meter sub-assembly | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit (for automatic air conditioning system) | |
| Air conditioning signal circuit (for manual air conditioning system) | ||
| ECM | ||
| Hesitation/Poor acceleration (poor drivability) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel lines | - | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Mass air flow meter sub-assembly | ||
| Throttle with motor body assembly | ||
| Intake system | ||
| Valve timing | ||
| Knock control sensor | ||
| Compression | ||
| Brake override system | ||
| Surging (poor drivability) | Spark plug | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Mass air flow meter sub-assembly | ||
| Variable Valve Timing (VVT) system | ||
| Compression | ||
| Engine stalls soon after starting | Engine immobiliser system (w/ entry and start system) | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Spark plug | ||
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Mass air flow meter sub-assembly | ||
| Variable Valve Timing (VVT) system | ||
| Throttle with motor body assembly | ||
| Intake system | ||
| Manifold absolute pressure sensor | ||
| PCV valve and hose | ||
| EGR valve assembly | ||
| Compression |