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Home >> Lexus >> 2008 >> GS 350 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - SFI System Precaution, Troubleshooting Introduction, Symptoms Table & Diagnostic Trouble Code Chart >> SFI System >> Problem Symptoms Table
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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 

SFI SYSTEM - PROBLEM SYMPTOMS

Symptom Suspected Area See
Engine does not crank (Does not start) Check push-start function initialization -
Immobiliser system -
ECM power source circuit ECM POWER SOURCE CIRCUIT
VC output circuit VC OUTPUT CIRCUIT
Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
Starter INSPECTION
No initial combustion (Does not start) ECM power source circuit ECM POWER SOURCE CIRCUIT
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel injector for port injection INSPECTION
Fuel injector for direct injection INSPECTION
ECM TERMINALS OF ECM 
Engine cranks normally but difficult to start Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel injector for port injection INSPECTION
Fuel injector for direct injection INSPECTION
Ignition system 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 DRIVE BELT
Difficult to start with cold engine Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
Ignition system 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 IGNITION COIL
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Fuel injector for port injection INSPECTION
Fuel injector for direct injection INSPECTION
Difficult to start with warm engine Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
Fuel injector for port injection INSPECTION
Fuel injector for direct injection INSPECTION
Ignition system 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 IGNITION COIL
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
High engine idle speed (Poor idling) ECM power source circuit ECM POWER SOURCE CIRCUIT
A/C signal circuit TERMINALS OF ECU
Electronic throttle control system THROTTLE BODY
Air induction system -
Ventilation hose -
Low engine idle speed (Poor idling) A/C signal circuit TERMINALS OF ECU
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Electronic throttle control system THROTTLE BODY
Air induction system -
Ventilation hose -
Rough idling (Poor idling) Compression DRIVE BELT
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Electronic throttle control system THROTTLE BODY
Air induction system -
Ventilation hose -
Hunting (Poor idling) ECM power source circuit ECM POWER SOURCE CIRCUIT
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Spark plug IGNITION COIL
Ignition system 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 INSPECTION
Fuel injector for direct injection INSPECTION
Electronic throttle control system THROTTLE BODY
Air induction system -
Ventilation hose -
Hesitation/Poor acceleration (Poor driveability) Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Spark plug IGNITION COIL
Ignition system 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 INSPECTION
Fuel injector for direct injection INSPECTION
Surging (Poor driveability) Spark plug IGNITION COIL
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Ignition system 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 INSPECTION
Fuel injector for direct injection INSPECTION
Engine stalls soon after starting Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Fuel pump for high pressure ON-VEHICLE INSPECTION
Spark plug IGNITION COIL
Ignition system 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 INSPECTION
Fuel injector for direct injection INSPECTION
Engine stalls during A/C operation A/C signal circuit TERMINALS OF ECU
ECM TERMINALS OF ECM 
Unable/difficult to refuel Refueling valve (canister) -
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