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) | Hybrid control system | |
| VC output circuit | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| VC output circuit | ||
| Crankshaft position sensor | ||
| Fuel injector circuit | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Valve timing | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Compression | ||
| Fuel injector assembly | ||
| Fuel injector circuit | ||
| Intake system | ||
| Throttle body assembly | ||
| PCV valve and hose | ||
| EGR valve assembly | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Fuel pump | ||
| Fuel line | - | |
| Ignition system | ||
| Fuel injector circuit | ||
| EGR valve assembly | ||
| ECM power source circuit | ||
| Crankshaft position sensor | ||
| Valve timing | ||
| High engine speed | Throttle body assembly | |
| Intake system | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV valve and hose | ||
| Low engine speed (Poor idle) | Throttle body assembly | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Intake system | ||
| PCV valve and hose | ||
| Rough idle | Rough idling | |
| Compression | ||
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel line | - | |
| Throttle body assembly | ||
| Valve timing | ||
| Intake system | ||
| PCV valve and hose | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Manifold absolute pressure sensor | ||
| Knock control sensor | ||
| EGR valve assembly | ||
| Hunting (Poor idle) | PCV valve and hose | |
| Air fuel ratio sensor | ||
| Mass air flow meter sub-assembly | ||
| Drive start control system | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | - |
| Fuel pump | ||
| Valve timing | ||
| Mass air flow meter sub-assembly | ||
| Throttle body assembly | ||
| Knock control sensor | ||
| Exhaust heat recirculation system (w/ exhaust heat recirculation system) | ||
| Brake override system | ||
| Drive start control system | ||
| Surging (Poor driveability) | Fuel line | - |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Engine stalls soon after starting | Mass air flow meter sub-assembly | |
| Intake system | ||
| Fuel pump control circuit | ||
| Manifold absolute pressure sensor | ||
| Fuel line | - | |
| Valve timing | ||
| EGR valve assembly | ||
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |