Tech Tips
Use the table below to help determine the cause of a problem. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
| Symptom | Suspected Area | Link |
|---|---|---|
| Engine does not crank (Does not start) | Battery | |
| Flow chart [Starter signal circuit] | ||
| Entry and start system | ||
| Starter relay assembly | ||
| Starter assembly | ||
| Park/neutral position switch | ||
| Flow chart [VC output circuit] | ||
| No initial combustion (Does not start) | Immobiliser system*1 | |
| Immobiliser system*2 | ||
| Flow chart [ECM power source circuit] | ||
| Flow chart [VC output circuit] | ||
| Crankshaft position sensor | ||
| Flow chart [Fuel pump control circuit] | ||
| Ignition system | ||
| Ignition circuit | ||
| Flow chart [Fuel injector circuit] | ||
| Camshaft position sensor (for intake camshaft) | ||
| Camshaft position sensor (for exhaust camshaft) | ||
| Fuel injector assembly | ||
| Intake system | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| Engine cranks normally but difficult to start | Flow chart [Fuel pump control circuit] | |
| Flow chart [Engine difficult to start] | Click here | |
| Flow chart [ECM power source circuit] | ||
| Fuel pump | ||
| Engine coolant temperature sensor | ||
| Ignition system | ||
| Fuel injector assembly | ||
| Compression | ||
| Flow chart [Fuel injector circuit] | ||
| PCV valve and hose | ||
| Intake system | ||
| Throttle body assembly | ||
| Flow chart [Starter signal circuit] | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| Spark plug | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| Incomplete intermittent combustion occurs (Does not start) | Flow chart [Fuel pump control circuit] | |
| Fuel pump | ||
| Fuel lines | - | |
| Ignition system | ||
| Fuel injector assembly | ||
| Intake system | ||
| Spark plug | ||
| Ignition circuit | ||
| Flow chart [Fuel injector circuit] | ||
| Crankshaft position sensor | ||
| Flow chart [ECM power source circuit] | ||
| Camshaft position sensor (for intake camshaft) | ||
| Camshaft position sensor (for exhaust camshaft) | ||
| Flow chart [Starter signal circuit] | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| High engine speed (Poor idle) | Air conditioning signal circuit*3 | |
| Throttle body assembly | ||
| Intake system | ||
| Engine coolant temperature sensor | ||
| Flow chart [ECM power source circuit] | ||
| Flow chart [Fuel pump control circuit] | ||
| PCV valve and hose | ||
| PCV valve | ||
| Low engine speed (Poor idle) | Flow chart [Fuel pump control circuit] | |
| Throttle body assembly | ||
| Intake system | ||
| PCV valve and hose | ||
| PCV valve | ||
| Engine stalls on deceleration | Idle speed (refer to "Low engine speed" symptom) | - |
| Rough idle | Flow chart [Rough idling] | |
| Compression | ||
| Throttle body assembly | ||
| Air fuel ratio sensor | ||
| Heated oxygen sensor | ||
| Mass air flow meter | ||
| Manifold absolute pressure sensor | ||
| Fuel pump | ||
| Fuel injector assembly | ||
| Ignition system | ||
| Fuel lines | - | |
| Flow chart [Fuel pump control circuit] | ||
| Fuel pump | ||
| Spark plug | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| Intake system | ||
| PCV hose | ||
| PCV valve | ||
| VALVEMATIC system | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| External part malfunction (Increase in load: A/C system, CVT system, etc.) | - | |
| Hunting (Poor idle) | PCV hose | |
| PCV valve | ||
| Flow chart [Fuel pump control circuit] | ||
| Spark plug | ||
| Throttle body assembly | ||
| Flow chart [ECM power source circuit] | ||
| Intake system | ||
| Flow chart [Drive start control system] | Click here | |
| Mass air flow meter | ||
| Air fuel ratio sensor | ||
| Engine stalls during air conditioning operation | Air conditioning signal circuit*3 | |
| ECM | ||
| Hesitation/Poor acceleration (Poor driveability) | VALVEMATIC system | |
| Flow chart [Lack of power or hesitation] | ||
| Fuel line | - | |
| Fuel pump | ||
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| Mass air flow meter | ||
| Throttle body assembly | ||
| Knock sensor | ||
| Fuel injector assembly | ||
| Intake system | ||
| Ignition system | ||
| Flow chart [Fuel pump control circuit] | ||
| Compression | ||
| Flow chart [Drive start control system] | ||
| Flow chart [Brake override system] | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| Lack of power | Lack of power | |
| Surging (Poor driveability) | Fuel line | - |
| Flow chart [Fuel pump control circuit] | ||
| Flow chart [Fuel injector circuit] | ||
| Fuel pump | ||
| Ignition system | ||
| Ignition circuit | ||
| Mass air flow meter | ||
| Compression | ||
| Fuel injector assembly | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| Engine stalls soon after starting | Mass air flow meter | |
| Intake system | ||
| Flow chart [Fuel pump control circuit] | ||
| Fuel pump | ||
| Ignition system | ||
| Crankshaft position sensor | ||
| Throttle body assembly | ||
| Manifold absolute pressure sensor | ||
| Fuel line | - | |
| Valve timing (check for loose or jumped teeth on timing chain) | ||
| VALVEMATIC system | ||
| Flow chart [Engine stalls] | ||
| No. 1 valve rocker arm sub-assembly*4 | ||
| Shift solenoid valve SL | ||
| Engine stalls soon after slow down | Flow chart [Engine stalls] | |
| Fuel injector assembly | ||
| Throttle body assembly | ||
| Ignition system | ||
| Crankshaft position sensor | ||
| ECM | ||
| MIL (malfunction indicator lamp) malfunction | MIL Circuit | |
| Meter/Gauge system |
*1: w/o Entry and Start System
*2: w/ Entry and Start System
*3: for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor
Tech Tips
*4: Check "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 a possibility that the No. 1 valve rocker arm sub-assembly will become loose and malfunction, so check that the No. 1 valve rocker arm sub-assembly is properly attached.