LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FSE) - SFI System Diagnostic Introduction, Problem Symptoms Table, Diagnostic Trouble Code Chart >> SFI System >> Problem Symptoms Table
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Problem Symptoms Table

HINT:

Use the table below to help determine the cause of the problem. The potential cases 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 

PROBLEM SYMPTOMS CHART

Symptom Suspected Area See
Engine does not crank (Does not start) 1. Check push-start function initialization INITIALIZATION
2. Immobilizer System PROBLEM SYMPTOMS TABLE
3. ECM power source circuit ECM POWER SOURCE CIRCUIT
4. VC out put circuit VC OUTPUT CIRCUIT
5. Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
6. Starter STARTER
No initial combustion (Does not start) 1. ECM power source circuit ECM POWER SOURCE CIRCUIT
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. ECM TERMINALS OF ECM 
Engine cranks normally but difficult to start 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
2. Fuel pump for high pressure ON-VEHICLE INSPECTION
3. Compression ON-VEHICLE INSPECTION
Difficult to start with cold engine 1. Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
2. Ignition system ON-VEHICLE INSPECTION
3. Spark plug ON-VEHICLE INSPECTION
4. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
5. Fuel pump for high pressure ON-VEHICLE INSPECTION
6. Fuel injector for direct injection INSPECTION
7. Fuel injector for port injection INSPECTION
Difficult to start with worm engine 1. Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
2. Fuel injector for port injection INSPECTION
3. Fuel injector for direct injection INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Spark plug ON-VEHICLE INSPECTION
6. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
7. Fuel pump for high pressure ON-VEHICLE INSPECTION
High engine idle speed (Poor idling) 1. ECM power source circuit ECM POWER SOURCE CIRCUIT
2. A/C signal circuit (compressor circuit) -
3. Electronic throttle control system ON-VEHICLE INSPECTION
4. Air induction system -
5. PCV hose ON-VEHICLE INSPECTION
Low engine idle speed (Poor idling) 1. A/C signal circuit (compressor circuit) AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. Fuel pump for high pressure ON-VEHICLE INSPECTION
4. Electronic throttle control system ON-VEHICLE INSPECTION
5. Air induction system -
6. PCV hose ON-VEHICLE INSPECTION
Rough idling (Poor idling) 1. Compression ON-VEHICLE INSPECTION
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. Fuel pump for high pressure ON-VEHICLE INSPECTION
4. Electronic throttle control system ON-VEHICLE INSPECTION
5. Air induction system -
6. PCV hose ON-VEHICLE INSPECTION
Hunting (Poor idling) 1. ECM power source circuit ECM POWER SOURCE CIRCUIT
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. Fuel pump for high pressure ON-VEHICLE INSPECTION
4. Spark plug ON-VEHICLE INSPECTION
5. Ignition system ON-VEHICLE INSPECTION
6. Fuel injector for port injection ON-VEHICLE INSPECTION
7. Fuel injector for direct injection INSPECTION
8. Electronic throttle control system ON-VEHICLE INSPECTION
9. Air induction system -
10. PCV hose ON-VEHICLE INSPECTION
Hesitation / Poor acceleration (Poor driveability) 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
2. Fuel pump for high pressure ON-VEHICLE INSPECTION
3. Spark plug ON-VEHICLE INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Fuel injector for port injection INSPECTION
6. Fuel injector for direct injection INSPECTION
Surging (Poor driveability) 1. Spark plug ON-VEHICLE INSPECTION
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. Fuel pump for high pressure ON-VEHICLE INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Fuel injector for port injection INSPECTION
6. Fuel injector for direct injection INSPECTION
Engine stalls soon after starting 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
2. Fuel pump for high pressure ON-VEHICLE INSPECTION
3. Spark plug ON-VEHICLE INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Fuel injector for port injection INSPECTION
6. Fuel injector for direct injection INSPECTION
Engine stalls during A/C operation 1. A/C signal circuit (Compressor circuit) AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT
2. ECM TERMINALS OF ECM 
Unable/difficult refuel 1. Refueling valve (canister) -