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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - SFI System Precautions, Parts Location, Diagnostic And Troubleshooting Introduction, 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 problem symptoms. If multiple suspected areas are listed, 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 

PROBLEM SYMPTOMS CHART

Symptom Suspected Area See Procedure
Engine does not crank (Does not start) Battery ON-VEHICLE INSPECTION
Starter INSPECTION
Starter relay RELAY
Park/neutral position switch INSPECTION
Engine immobilizer system HOW TO PROCEED WITH TROUBLESHOOTING
Smart access system with push-button start ENGINE DOES NOT START
No initial combustion (Does not start) ECM power source circuit ECM POWER SOURCE CIRCUIT
Crankshaft position sensor DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT; DTC P0337 CRANKSHAFT POSITION SENSOR "A" CIRCUIT LOW INPUT; DTC P0338 CRANKSHAFT POSITION SENSOR "A" CIRCUIT HIGH INPUT; DTC P0339 CRANKSHAFT POSITION SENSOR "A" CIRCUIT INTERMITTENT
Camshaft position sensor DTC P1340 CAMSHAFT POSITION SENSOR "A" (BANK 1 SENSOR 2); DTC P1342 CAMSHAFT POSITION SENSOR "A" LOW INPUT (MRE); DTC P1343 CAMSHAFT POSITION SENSOR "A" HIGH INPUT (MRE)
Ignition system ON-VEHICLE INSPECTION
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
ECM TERMINALS OF ECM 
VC output circuit VC OUTPUT CIRCUIT
Engine cranks normally but difficult to start Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Compression DRIVE BELT
Difficult to start with cold engine Ignition system ON-VEHICLE INSPECTION
Spark plug CAMSHAFT OIL CONTROL VALVE
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Injector INSPECTION
Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
Difficult to start with warm engine Injector INSPECTION
Ignition system ON-VEHICLE INSPECTION
Spark plug CAMSHAFT OIL CONTROL VALVE
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
High engine idle speed Electronic throttle control system INSPECTION
A/C signal circuit TERMINALS OF ECU
ECM power source circuit ECM POWER SOURCE CIRCUIT
Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
Low engine idle speed (Poor idling) Electronic throttle control system ON-VEHICLE INSPECTION
A/C signal circuit TERMINALS OF ECU
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Air induction system INTAKE MANIFOLD
Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
PCV hose ON-VEHICLE INSPECTION
Rough idling Compression DRIVE BELT
Spark plug CAMSHAFT OIL CONTROL VALVE
Injector INSPECTION
Ignition system ON-VEHICLE INSPECTION
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Electronic throttle control system ON-VEHICLE INSPECTION
Air induction system INTAKE MANIFOLD
Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
PCV hose ON-VEHICLE INSPECTION
Mass air flow meter MASS AIR FLOW METER
Idle hunting Electronic throttle control system ON-VEHICLE INSPECTION
Air induction system INTAKE MANIFOLD
ECM power source circuit ECM POWER SOURCE CIRCUIT
Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
Hesitation/Poor acceleration A/T faulty PROBLEM SYMPTOMS TABLE
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Spark plug CAMSHAFT OIL CONTROL VALVE
Ignition system ON-VEHICLE INSPECTION
Injector INSPECTION
Mass air flow meter MASS AIR FLOW METER
Electronic throttle control system ON-VEHICLE INSPECTION
Air induction system INTAKE MANIFOLD
Compression DRIVE BELT
Surging (Poor driveability) Spark plug CAMSHAFT OIL CONTROL VALVE
Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Ignition system ON-VEHICLE INSPECTION
Injector INSPECTION
Mass air flow meter MASS AIR FLOW METER
Variable valve timing system ON-VEHICLE INSPECTION
Compression DRIVE BELT
Engine stalls soon after starting Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
Spark plug CAMSHAFT OIL CONTROL VALVE
Ignition system ON-VEHICLE INSPECTION
Injector INSPECTION
Variable valve timing system ON-VEHICLE INSPECTION
Electronic throttle control system ON-VEHICLE INSPECTION
Air induction system INTAKE MANIFOLD
PCV hose ON-VEHICLE INSPECTION
Compression DRIVE BELT
Engine stalls only during A/C operation A/C signal circuit TERMINALS OF ECU
ECM TERMINALS OF ECM 
Unable/difficult to refuel Refueling valve (canister) INSPECTION