| Last Modified: 11-29-2007 | 1.6 T | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000PDG06LX |
| Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: PROBLEM SYMPTOMS TABLE (2008 Sequoia) | ||
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the problem symptom. 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.
SFI System
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
Engine does not crank (Does not start) |
Battery |
|
|
Starter |
|
|
|
Cranking holding function circuit |
|
|
|
Starter relay |
|
|
|
Park/neutral position switch (for 2WD) |
|
|
|
Park/neutral position switch (for 4WD) |
|
|
|
Immobiliser system |
|
|
|
No initial combustion (Does not start) |
ECM power source circuit |
|
|
Crankshaft position sensor |
|
|
|
VVT sensor |
|
|
|
Ignition system |
|
|
|
Fuel pump control circuit |
|
|
|
Fuel injector circuit |
|
|
|
ECM |
|
|
|
VC output circuit |
|
|
|
Engine cranks normally but difficult to start |
Fuel pump control circuit |
|
|
Fuel pump |
|
|
|
Fuel injector circuit |
|
|
|
ECM power source circuit |
|
|
|
Engine coolant temperature sensor |
|
|
|
Air induction system |
|
|
|
Ignition system |
|
|
|
Spark plug |
|
|
|
Electronic throttle control system |
|
|
|
Compression |
|
|
|
Difficult to start with cold engine |
Ignition system |
|
|
Spark plug |
|
|
|
Fuel pump control circuit |
|
|
|
Fuel injector circuit |
|
|
|
Injector |
|
|
|
Difficult to start with warm engine |
Fuel injector circuit |
|
|
Injector |
|
|
|
Ignition system |
|
|
|
Spark plug |
|
|
|
Fuel pump control circuit |
|
|
|
High engine idle speed |
Electronic throttle control system |
|
|
A/C signal circuit |
|
|
|
ECM power source circuit |
|
|
|
Acoustic Control Induction System (ACIS) |
|
|
|
Low engine idle speed (Poor idling) |
Electronic throttle control system |
|
|
A/C signal circuit |
|
|
|
Fuel pump control circuit |
|
|
|
Fuel pump |
|
|
|
Air induction system |
|
|
|
Acoustic Control Induction System (ACIS) |
|
|
|
PCV hose |
|
|
|
Rough idling |
Compression |
|
|
Spark plug |
|
|
|
Fuel injector circuit |
|
|
|
Injector |
|
|
|
Ignition system |
|
|
|
Fuel pump control circuit |
|
|
|
Fuel pump |
|
|
|
Electronic throttle control system |
|
|
|
Air induction system |
|
|
|
Acoustic Control Induction System (ACIS) |
|
|
|
PCV hose |
|
|
|
Mass air flow meter |
|
|
|
Idle hunting |
Electronic throttle control system |
|
|
Air induction system |
|
|
|
ECM power source circuit |
|
|
|
Acoustic Control Induction System (ACIS) |
|
|
|
Hesitation/Poor acceleration |
Fuel pump control circuit |
|
|
Fuel pump |
|
|
|
Spark plug |
|
|
|
Ignition system |
|
|
|
Fuel injector circuit |
|
|
|
Injector |
|
|
|
Mass air flow meter |
|
|
|
Electronic throttle control system |
|
|
|
Air induction system |
|
|
|
Compression |
|
|
|
Surging (Poor driveability) |
Spark plug |
|
|
Fuel pump control circuit |
|
|
|
Fuel pump |
|
|
|
Fuel injector circuit |
|
|
|
Ignition system |
|
|
|
Injector |
|
|
|
Mass air flow meter |
|
|
|
Variable valve timing system |
|
|
|
Compression |
|
|
|
Engine stalls soon after starting |
Fuel pump control circuit |
|
|
Fuel pump |
|
|
|
Spark plug |
|
|
|
Ignition system |
|
|
|
Fuel injector circuit |
|
|
|
Injector |
|
|
|
Variable valve timing system |
|
|
|
Electronic throttle control system |
|
|
|
Air induction system |
|
|
|
PCV hose |
|
|
|
Compression |
|
|
|
Engine stalls only during A/C operation |
A/C signal circuit |
|
|
ECM |
|
|
|
Unable/difficult to refuel |
Refueling valve (canister) |
- |
|
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