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 | ||
| Starter relay | ||
| Park/neutral position switch assembly (for A/T) | ||
| VC output circuit | ||
| No initial combustion (Does not start) | ECM power source circuit | |
| Crankshaft position sensor | ||
| Camshaft position sensor | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Fuel injector circuit | ||
| ECM | ||
| VC output circuit | ||
| Starter signal circuit | ||
| Engine immobiliser system | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Engine cranks normally but has difficulty in starting | Fuel pump control circuit | |
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Compression | ||
| Fuel injector | ||
| Fuel injector circuit | ||
| Air induction system | - | |
| Electronic throttle control system | ||
| PCV hose | ||
| Starter signal circuit | ||
| ECM power source circuit | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Difficult to start with cold engine | Ignition system | |
| Spark plug | ||
| Fuel pump control circuit | ||
| Fuel injector | ||
| Starter signal circuit | ||
| Difficult to start with warm engine | Fuel injector | |
| Ignition system | ||
| Spark plug | ||
| Fuel pump control circuit | ||
| Starter signal circuit | ||
| High engine idle speed | Electronic throttle control system | |
| A/C signal circuit | ||
| ECM power source circuit | ||
| Low engine idle speed (Poor idling) | Electronic throttle control system | |
| A/C signal circuit | ||
| Fuel pump control circuit | ||
| Air induction system | - | |
| PCV hose | ||
| Rough idling | Compression | |
| Spark plug | ||
| Fuel injector | ||
| Ignition system | ||
| Fuel pump control circuit | ||
| Electronic throttle control system | ||
| Air induction system | - | |
| PCV hose | ||
| Mass air flow meter | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Hunting (Poor idling) | Electronic throttle control system | |
| Air induction system | - | |
| ECM power source circuit | ||
| Hesitation and/or poor acceleration | Fuel pump control circuit | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector | ||
| Mass air flow meter | ||
| Electronic throttle control system | ||
| Air induction system | - | |
| Compression | ||
| Brake override system | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Surging (Poor driveability) | Spark plug | |
| Fuel pump control circuit | ||
| Ignition system | ||
| Fuel injector | ||
| Mass air flow meter | ||
| Variable valve timing system | ||
| Compression | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Engine stalls soon after starting | Fuel pump control circuit | |
| Spark plug | ||
| Ignition system | ||
| Fuel injector | ||
| Variable valve timing system | ||
| Electronic throttle control system | ||
| Air induction system | - | |
| PCV hose | ||
| Compression | ||
| No. 1 valve rocker arm sub-assembly* | - | |
| Engine stalls only during A/C operation | A/C signal circuit | |
| ECM |
Tech Tips
*: Check the "Fuel Cut Elps Time" in the Data List.
If the elapsed time is over 0 sec, then the engine speed is high (More than the engine speed at which fuel cut occurs + 500 rpm).
When this has happened, there is the possibility that the valve rocker arm will become loose and malfunction, so check that the No. 1 valve rocker arm sub-assembly is properly attached Click here.