LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> GS 350 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) >> SFI System >> Problem Symptoms Table >> 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 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 Refer To
Engine does not crank (Does not start) Check push-start function initialization -
Immobiliser system -
ECM power source circuit Refer to ECM Power Source Circuit
VC output circuit Refer to VC Output Circuit
Cranking holding function circuit Refer to Cranking Holding Function Circuit
Starter Refer to INSPECTION
No initial combustion (Does not start) ECM power source circuit Refer to ECM Power Source Circuit
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
ECM Refer to TERMINALS OF ECM 
Engine cranks normally but difficult to start Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Compression Refer to ON-VEHICLE INSPECTION - Step 4
Difficult to start with cold engine Cranking holding function circuit Refer to Cranking Holding Function Circuit
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Difficult to start with warm engine Cranking holding function circuit Refer to Cranking Holding Function Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
High engine idle speed (Poor idling) ECM power source circuit Refer to ECM Power Source Circuit
A/C signal circuit Refer to TERMINALS OF ECU
Electronic throttle control system Refer to ON-VEHICLE INSPECTION - Step 1
Air induction system -
Ventilation hose -
Low engine idle speed (Poor idling) A/C signal circuit Refer to TERMINALS OF ECU
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Electronic throttle control system Refer to ON-VEHICLE INSPECTION - Step 1
Air induction system -
Ventilation hose -
Rough idling (Poor idling) Compression Refer to ON-VEHICLE INSPECTION - Step 4
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Electronic throttle control system Refer to ON-VEHICLE INSPECTION - Step 1
Air induction system -
Ventilation hose -
Hunting (Poor idling) ECM power source circuit Refer to ECM Power Source Circuit
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Electronic throttle control system Refer to ON-VEHICLE INSPECTION - Step 1
Air induction system -
Ventilation hose -
Hesitation/Poor acceleration (Poor driveability) Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Surging (Poor driveability) Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Engine stalls soon after starting Fuel pump control circuit Refer to Fuel Pump Control Circuit
Fuel pump for high pressure Refer to ON-VEHICLE INSPECTION
Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
Ignition system Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit
Fuel injector for port injection Refer to INSPECTION
Fuel injector for direct injection Refer to INSPECTION
Engine stalls during A/C operation A/C signal circuit Refer to TERMINALS OF ECU
ECM Refer to TERMINALS OF ECM 
Unable/difficult to refuel Refueling valve (canister) -