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) | Hybrid control system | |
| VC output circuit (ECM 5 V output) | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| VC output circuit (ECM 5 V output) | ||
| Crankshaft position sensor | ||
| Camshaft position sensor | ||
| Fuel pump control circuit | ||
| Fuel injector circuit | ||
| Ignition system | ||
| Valve timing | ||
| Engine cranks normally but difficult to start | Fuel pump control circuit | |
| Fuel pump (for high pressure) | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Compression | ||
| Intake system | ||
| Throttle body with motor assembly | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| ECM power source circuit | ||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Ignition system | ||
| Fuel line | ||
| Fuel pump | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Crankshaft position sensor | ||
| Camshaft position sensor | ||
| Valve timing | ||
| ECM power source circuit | ||
| High engine speed (Poor idle) | Throttle body with motor assembly | |
| Intake system | ||
| Engine coolant temperature sensor | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| PCV system | ||
| ECM power source circuit | ||
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Fuel pump (for high pressure) | ||
| Throttle body with motor assembly | ||
| Intake system | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| Rough idle | Compression | |
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter | ||
| Ignition system | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Fuel line | ||
| Fuel pump | ||
| Fuel pump (for high pressure) | ||
| Intake system | ||
| Electronic throttle control system | ||
| Spark plug | ||
| Fuel injector circuit | ||
| ECM power source circuit | ||
| Fuel pump control circuit | ||
| Manifold absolute pressure sensor | ||
| Knock sensor | ||
| Purge VSV | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| Hunting (Poor idle) | Electronic throttle control system | |
| Intake system | ||
| ECM power source circuit | ||
| PCV hose (w/ canister pump module) | ||
| PCV hose (w/o canister pump module) | ||
| Mass air flow meter | ||
| Air fuel ratio sensor | ||
| Hesitation/Poor acceleration (Poor driveability) | Fuel line | |
| Fuel pump | ||
| Fuel pump (for high pressure) | ||
| Spark plug | ||
| Ignition system | ||
| Fuel injector assembly (for port injection) | ||
| Fuel injector assembly (for direct injection) | ||
| Fuel pump control circuit | ||
| ECM power source circuit | ||
| Mass air flow meter | ||
| Throttle body with motor assembly | ||
| Intake system | ||
| Knock sensor | ||
| Compression | ||
| Surging (Poor driveability) | Spark plug | |
| Fuel line | ||
| Fuel pump control circuit | ||
| Fuel pump (for high pressure) | ||
| Ignition system | ||
| 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 | ||
| Fuel pump (for high pressure) | ||
| Fuel line | ||
| Spark plug | ||
| Ignition system | ||
| 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 body with motor assembly | ||
| Intake system | ||
| PCV valve and hose | ||
| Manifold absolute pressure sensor | ||
| Compression | ||
| Unable/difficult to refuel* | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |
| MIL (malfunction indicator lamp) malfunction | MIL Circuit | |
| Combination meter system |
*: w / Canister Pump Module