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 | ||
| Crank position sensor | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel injector circuit | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Compression | ||
| Fuel injector assembly | ||
| Fuel injector circuit | Click here | |
| 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 | ||
| Crank position sensor | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| High engine speed | Throttle body assembly | |
| Intake system | ||
| ECM power source circuit | ||
| Engine coolant temperature sensor | ||
| PCV system | ||
| Low engine speed (poor idle) | Throttle body assembly | |
| Fuel pump control circuit | ||
| Fuel pump | ||
| Intake system | ||
| PCV system | ||
| Rough idle | Compression | |
| Ignition system | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Fuel pump | ||
| Fuel line | - | |
| Throttle body assembly | ||
| Intake system | ||
| PCV system | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter sub-assembly | ||
| Manifold absolute pressure sensor | Click here | |
| Knock control sensor | ||
| EGR valve assembly | ||
| Hunting (poor idle) | PCV system | |
| Air fuel ratio sensor | ||
| Mass air flow meter sub-assembly | ||
| Hesitation and/or poor acceleration | Fuel line | - |
| Fuel pump | Click here | |
| Valve timing (check for loose or jumped teeth on timing chain) | Click here | |
| Mass air flow meter sub-assembly | Click here | |
| Throttle body assembly | Click here | |
| Knock control sensor | Click here | |
| Brake override system | Click here | |
| Surging (poor driveability) | Fuel line | - |
| Fuel pump control circuit | Click here | |
| Fuel pump | Click here | |
| Ignition system | Click here | |
| Fuel injector assembly | ||
| Engine stalls soon after starting | Mass air flow meter sub-assembly | |
| Intake system | ||
| Manifold absolute pressure sensor | ||
| Fuel line | - | |
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| EGR valve assembly |