Problem Symptoms Table
When the malfunction is not identified in the diagnostic trouble code check and or in the basic inspection, use this table and troubleshoot according to the priority order given below.
SFI SYSTEM
PROBLEM SYMPTOMS REFERENCE
| Symptom | Suspected Area |
|---|---|
| Engine does not crank (Does not start) | Immobilizer system |
| Generator | |
| Hybrid system | |
| Shift lever position sensor | |
| No initial combustion (Does not start) | ECM (included in hybrid vehicle control ECU) power source circuit |
| VC output circuit | |
| Crankshaft position sensor | |
| Fuel pump control circuit | |
| Ignition system | |
| Fuel injector circuit | |
| Valve timing | |
| Engine cranks normally but difficult to start | Fuel pump control circuit |
| Ignition system | |
| Compression | |
| Fuel injector circuit | |
| Intake system | |
| Electronic throttle control system | |
| Difficult to start with cold engine | Ignition system |
| Fuel pump control circuit | |
| Fuel injector circuit | |
| Difficult to start with warm engine | Fuel injector circuit |
| Ignition system | |
| Fuel pump control circuit | |
| High engine idle speed (Poor idling) | Air conditioning signal circuit (for Automatic air conditioning system) |
| Air conditioning signal circuit (for Manual air conditioning system) | |
| Electronic throttle control system | |
| Engine coolant temperature sensor | |
| Intake system | |
| PCV system | |
| ECM (included in hybrid vehicle control ECU) power source circuit | |
| Low engine idle speed (Poor idling) | Fuel pump control circuit |
| Electronic throttle control system | |
| Intake syatem | |
| PCV system | |
| Rough idling (Poor idling) | Compression |
| Air fuel ratio sensor | |
| Mass air flow meter | |
| Intake system | |
| Fuel line (clocked) | |
| Fuel pump control circuit | |
| PCV system | |
| Hunting (Poor idling) | PCV system |
| Mass air flow meter | |
| Intake system | |
| Air fuel ratio sensor | |
| Electronic throttle control system | |
| Hesitation/ Poor acceleration (Poor driveability) | Fuel line |
| Fuel pump control circuit | |
| Valve timing | |
| Mass air flow meter | |
| Intake system | |
| Electronic throttle control system | |
| Knock sensor | |
| Surging (Poor driveability) | Fuel line |
| Fuel pump control circuit | |
| Ignition system | |
| Fuel injector circuit | |
| Engine stalls soon after starting | Mass air flow meter |
| Intake system | |
| Fuel line | |
| Fuel pump control circuit | |
| Ignition system | |
| Engine stalls during A/C operation | Air conditioning signal circuit (for Automatic air conditioning system) |
| Air conditioning signal circuit (for Manual air conditioning system) | |
| ECM (included in hybrid vehicle control ECU) | |
| Unable/difficult to refuel | Refueling valve (Canister) |