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Home >> Lexus >> 2020 >> GX 460 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) (1 Of 4) >> SFI System >> Problem Symptoms Table [08/2015 - 08/2019] >> Problem Symptoms Table [08/2015 - 08/2019]

Problem Symptoms Table [08/2015 - 08/2019]

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SFI SYSTEM

Symptom Suspected Area Refer To
Engine does not crank (Does not start) Battery Refer to PROCEDURE - Step 1
Starter Assembly Refer to PROCEDURE - Step 1
Smart Access System with Push-button Start (for Start Function) Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019]
Starter Relay Refer to PROCEDURE - Step 1
Park/neutral Position Switch Assembly Refer to PROCEDURE - Step 1
VC Output Circuit Refer to VC Output Circuit [08/2015 - 08/2019]
No initial combustion (Does not start) ECM Power Source Circuit Refer to ECM Power Source Circuit [08/2015 - 08/2019]
Crankshaft Position Sensor Refer to 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 [08/2015 - 08/2017] , or refer to 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 [08/2017 - ]
Camshaft Position Sensor Refer to 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) [08/2015 - ]
Ignition System Refer to PROCEDURE - Step 1
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Fuel Injector Circuit Refer to Fuel Injector Circuit [08/2015 - 08/2019]
ECM Refer to TERMINALS OF ECM [08/2015 - 08/2017] , or refer to TERMINALS OF ECM [08/2017 - 08/2019] 
VC Output Circuit Refer to VC Output Circuit [08/2015 - 08/2019]
Starter Signal Circuit Refer to Starter Signal Circuit [08/2015 - 08/2016] , or refer to Starter Signal Circuit [08/2016 - 08/2019]
Immobiliser System Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019]
Engine cranks normally but difficult to start Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
EGR Valve Assembly Refer to PROCEDURE - Step 1
Engine Coolant Temperature Sensor Refer to PROCEDURE - Step 1
Ignition System Refer to PROCEDURE - Step 1
Compression Refer to PROCEDURE - Step 3
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Fuel Injector Circuit Refer to Fuel Injector Circuit [08/2015 - 08/2019]
Intake System Refer to PROCEDURE - Step 3
Throttle Body Assembly Refer to PROCEDURE - Step 1
PCV Hose Refer to PROCEDURE - Step 3
Starter Signal Circuit Refer to Starter Signal Circuit [08/2015 - 08/2016] , or refer to Starter Signal Circuit [08/2016 - 08/2019]
ECM Power Source Circuit Refer to ECM Power Source Circuit [08/2015 - 08/2019]
Difficult to start with cold engine Ignition System Refer to PROCEDURE - Step 1
Spark Plug Refer to PROCEDURE - Step 3
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Starter Signal Circuit Refer to Starter Signal Circuit [08/2015 - 08/2016] , or refer to Starter Signal Circuit [08/2016 - 08/2019]
Difficult to start with warm engine Fuel Injector Assembly Refer to PROCEDURE - Step 1
Ignition System Refer to PROCEDURE - Step 1
Spark Plug Refer to PROCEDURE - Step 3
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Starter Signal Circuit Refer to Starter Signal Circuit [08/2015 - 08/2016] , or refer to Starter Signal Circuit [08/2016 - 08/2019]
High engine idle speed Electronic Throttle Control System Refer to PROCEDURE - Step 1
A/C Signal Circuit Refer to TERMINALS OF ECU [08/2015 - 08/2019]
ECM Power Source Circuit Refer to ECM Power Source Circuit [08/2015 - 08/2019]
Acoustic Control Induction System (ACIS) Refer to ACIS Control Circuit [08/2015 - ]
Low engine idle speed (Poor idling) Electronic Throttle Control System Refer to PROCEDURE - Step 1
A/C Signal Circuit Refer to TERMINALS OF ECU [08/2015 - 08/2019]
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Intake System Refer to PROCEDURE - Step 3
Acoustic Control Induction System (ACIS) Refer to ACIS Control Circuit [08/2015 - ]
PCV Hose Refer to PROCEDURE - Step 3
Rough idling Compression Refer to PROCEDURE - Step 3
Spark Plug Refer to PROCEDURE - Step 3
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Ignition System Refer to PROCEDURE - Step 1
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Electronic Throttle Control System Refer to PROCEDURE - Step 1
Intake System Refer to PROCEDURE - Step 3
Acoustic Control Induction System (ACIS) Refer to ACIS Control Circuit [08/2015 - ]
PCV Hose Refer to PROCEDURE - Step 3
Mass Air Flow Meter Refer to PROCEDURE - Step 1
EGR Valve Assembly Refer to PROCEDURE - Step 1
Hunting (Poor idling) Electronic Throttle Control System Refer to PROCEDURE - Step 1
Intake System Refer to PROCEDURE - Step 3
ECM Power Source Circuit Refer to ECM Power Source Circuit [08/2015 - 08/2019]
Acoustic Control Induction System (ACIS) Refer to ACIS Control Circuit [08/2015 - ]
Hesitation and/or poor acceleration Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Spark Plug Refer to PROCEDURE - Step 3
Ignition System Refer to PROCEDURE - Step 1
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Mass Air Flow Meter Refer to PROCEDURE - Step 1
Electronic Throttle Control System Refer to PROCEDURE - Step 1
Intake System Refer to PROCEDURE - Step 3
Compression Refer to PROCEDURE - Step 3
Brake Override System Refer to Brake Override System [08/2015 - 08/2016] , or refer to Brake Override System [08/2016 - 08/2019]
Surging (Poor driveability) Spark Plug Refer to PROCEDURE - Step 3
Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Ignition System Refer to PROCEDURE - Step 1
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Mass Air Flow Meter Refer to PROCEDURE - Step 1
Variable Valve Timing System Refer to PROCEDURE - Step 1
Compression Refer to PROCEDURE - Step 3
Engine stalls soon after starting Fuel Pump Control Circuit Refer to Fuel Pump Control Circuit [08/2015 - 08/2019]
Spark Plug Refer to PROCEDURE - Step 3
Ignition System Refer to PROCEDURE - Step 1
Fuel Injector Assembly Refer to PROCEDURE - Step 1
Variable Valve Timing System Refer to PROCEDURE - Step 1
Electronic Throttle Control System Refer to PROCEDURE - Step 1
Intake System Refer to PROCEDURE - Step 3
PCV Hose Refer to PROCEDURE - Step 3
Compression Refer to PROCEDURE - Step 3
EGR Valve Assembly Refer to PROCEDURE - Step 1
Engine stalls only during A/C operation A/C Signal Circuit Refer to TERMINALS OF ECU [08/2015 - 08/2019]
ECM Refer to TERMINALS OF ECM [08/2015 - 08/2017] , or refer to TERMINALS OF ECM [08/2017 - 08/2019] 
Unable/difficult to refuel Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) -