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 (except Cold Area) | ||
| Starter assembly (for TMC Made Cold Area Specification Vehicles) | ||
| Starter assembly (for TMMF Made Cold Area Specification Vehicles) | ||
| Clutch start switch assembly | ||
| Starter signal circuit (w/o entry and start system) | ||
| Entry and start system (for start function) | ||
| VC output circuit (w/ entry and start system) | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| VC output circuit (w/o entry and start system) | ||
| Crankshaft position sensor | ||
| Ignition circuit | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel injector circuit | ||
| Camshaft position sensor | ||
| Valve timing | ||
| Starter signal circuit (w/o entry and start system) | ||
| Cranking Holding Function Circuit (w/ entry and start system) | ||
| Immobiliser system (w/ entry and start system) | ||
| Immobiliser system (w/o entry and start system) | ||
| ECM | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel injector circuit | ||
| Fuel injector assembly | ||
| ECM power source circuit | ||
| Starter signal circuit (w/o entry and start system) | ||
| Cranking Holding Function Circuit (w/ entry and start system) | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Ignition circuit | ||
| Intake system | ||
| Spark plug | ||
| Throttle with motor body assembly | ||
| Crankshaft position sensor | ||
| Compression | ||
| EGR valve assembly | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | ||
| Ignition circuit | ||
| Ignition system | ||
| Intake system | ||
| Fuel injector circuit | ||
| Fuel injector assembly | ||
| Spark plug | ||
| ECM power source circuit | ||
| Starter signal circuit (w/o entry and start system) | ||
| Cranking Holding Function Circuit (w/ entry and start system) | ||
| Crankshaft position sensor | ||
| Camshaft 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) | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| EGR valve assembly | ||
| Low engine speed (Poor idling) | 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 | ||
| EGR valve assembly | ||
| Rough idle | Compression (engine mechanical) | |
| Spark plug | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel injector assembly | ||
| Fuel line | ||
| Throttle with motor body assembly | ||
| Ignition circuit | ||
| Ignition system | ||
| Intake system | ||
| Purge VSV | ||
| PCV valve and hose | ||
| Heated oxygen sensor | ||
| No. 2 heated oxygen sensor | ||
| Manifold Absolute Pressure Sensor | ||
| Knock sensor | ||
| Air conditioning signal circuit (for automatic air conditioning system) | ||
| Air conditioning signal circuit (for manual air conditioning system) | ||
| EGR valve assembly | ||
| Hunting (Poor idling) | Throttle with motor body assembly | |
| Intake system | ||
| PCV valve and hose | ||
| Manifold Absolute Pressure Sensor | ||
| Heated oxygen sensor | ||
| EGR valve assembly | ||
| Hesitation/Poor acceleration (poor drivability) | Fuel pump control circuit | |
| Fuel line | ||
| Fuel pump | ||
| Fuel injector assembly | ||
| Spark plug | ||
| Ignition system | ||
| Ignition circuit | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Manifold Absolute Pressure Sensor | ||
| Throttle with motor body assembly | ||
| Knock sensor | ||
| Intake system | ||
| Valve timing | ||
| Compression | ||
| EGR valve assembly | ||
| Surging (Poor drivability) | Spark plug | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel injector assembly | ||
| Ignition system | ||
| Ignition circuit | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Manifold Absolute Pressure Sensor | ||
| Variable Valve Timing (VVT) system | ||
| Compression | ||
| Engine stalls soon after starting | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel injector assembly | ||
| Spark plug | ||
| Ignition system | ||
| Ignition circuit | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Manifold Absolute Pressure Sensor | ||
| Variable Valve Timing (VVT) system | ||
| Throttle with motor body assembly | ||
| Intake system | ||
| PCV valve and hose | ||
| Compression | ||
| 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 |