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Home >> Lexus >> 2023 >> RC F Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostics - Introduction (1 Of 8) >> SFI System >> Problem Symptoms Table [09/2014 - 11/2017] >> Problem Symptoms Table [09/2014 - 11/2017]

Problem Symptoms Table [09/2014 - 11/2017]

HINT: 

SFI SYSTEM

Symptom Suspected Area Link
Engine does not crank (Does not start) Battery Refer to PROCEDURE - Step 1
ST relay Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Starter assembly Refer to INSPECTION [09/2014 - ]
VC output circuit (ECM 5 V output) Refer to VC Output Circuit [09/2014 - ]
Starter signal circuit Refer to Starter Signal Circuit [09/2014 - 10/2015] , or refer to Starter Signal Circuit [10/2015 - ]
Smart access system with push-button start (for start function) Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 01/2023]
Park/neutral position switch assembly Refer to INSPECTION [09/2014 - ]
No initial combustion (Does not start) Immobilizer system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 01/2023]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
VC output circuit (ECM 5 V output) Refer to VC Output Circuit [09/2014 - ]
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 [09/2014 - ]
VVT sensor (for intake camshaft) Refer to DTC P0340: Camshaft Position Sensor Circuit; DTC P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor); DTC P0343: Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor); DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2); DTC P0347: Camshaft Position Sensor "A" Circuit Low Input (Bank 2); DTC P0348: Camshaft Position Sensor "A" Circuit High Input (Bank 2) [09/2014 - ]
VVT sensor (for exhaust camshaft) Refer to DTC P0365: Camshaft Position Sensor "B" Circuit (Bank 1); DTC P0367: Camshaft Position Sensor "B" Circuit Low Input (Bank 1); DTC P0368: Camshaft Position Sensor "B" Circuit High Input (Bank 1); DTC P0390: Camshaft Position Sensor "B" Circuit (Bank 2); DTC P0392: Camshaft Position Sensor "B" Circuit Low Input (Bank 2); DTC P0393: Camshaft Position Sensor "B" Circuit High Input (Bank 2) [09/2014 - ]
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) [09/2014 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
Starter signal circuit Refer to Starter Signal Circuit [09/2014 - 10/2015] , or refer to Starter Signal Circuit [10/2015 - ]
ECM Refer to TERMINALS OF ECM [09/2014 - 11/2017] 
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Engine cranks normally but difficult to start Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Engine coolant temperature sensor Refer to INSPECTION [09/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
Compression Refer to PROCEDURE - Step 10
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Engine difficult to start Refer to Engine Difficult to Start [09/2014 - 11/2017]
PCV hose Refer to COMPONENTS [09/2014 - ]
Starter signal circuit Refer to Starter Signal Circuit [09/2014 - 10/2015] , or refer to Starter Signal Circuit [10/2015 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Incomplete intermittent combustion occurs (Does not start) Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Fuel line -
Fuel pump (for low pressure side) Refer to INSPECTION [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
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 [09/2014 - ]
VVT sensor (for intake camshaft) Refer to DTC P0340: Camshaft Position Sensor Circuit; DTC P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor); DTC P0343: Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor); DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2); DTC P0347: Camshaft Position Sensor "A" Circuit Low Input (Bank 2); DTC P0348: Camshaft Position Sensor "A" Circuit High Input (Bank 2) [09/2014 - ]
VVT sensor (for exhaust camshaft) Refer to DTC P0365: Camshaft Position Sensor "B" Circuit (Bank 1); DTC P0367: Camshaft Position Sensor "B" Circuit Low Input (Bank 1); DTC P0368: Camshaft Position Sensor "B" Circuit High Input (Bank 1); DTC P0390: Camshaft Position Sensor "B" Circuit (Bank 2); DTC P0392: Camshaft Position Sensor "B" Circuit Low Input (Bank 2); DTC P0393: Camshaft Position Sensor "B" Circuit High Input (Bank 2) [09/2014 - ]
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) [09/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
Starter signal circuit Refer to Starter Signal Circuit [09/2014 - 10/2015] , or refer to Starter Signal Circuit [10/2015 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
High engine speed Air conditioning signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Engine coolant temperature sensor Refer to INSPECTION [09/2014 - ]
PCV hose Refer to COMPONENTS [09/2014 - ]
PCV system Refer to ON-VEHICLE INSPECTION [09/2014 - 09/2020]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
Low engine speed (Poor idle) Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
PCV hose Refer to COMPONENTS [09/2014 - ]
Engine stalls on deceleration Idle speed (refer to "Low engine speed" symptom) Refer to Engine Stalls [09/2014 - 11/2017]
Rough idle Rough idling Refer to Rough Idling [09/2014 - 11/2017]
Compression (engine mechanical) Refer to PROCEDURE - Step 10
Air fuel ratio sensor Refer to INSPECTION [09/2014 - ]
Heated oxygen sensor Refer to INSPECTION [09/2014 - ]
Mass air flow meter sub-assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Air conditioning signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
Fuel line -
Fuel pump (for low pressure side) Refer to INSPECTION [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Electronic throttle control system Refer to DTC P0120: Throttle Pedal Position Sensor / Switch "A" Circuit; DTC P0121: Throttle Pedal Position Sensor / Switch "A" Circuit Range / Performance; DTC P0122: Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input; DTC P0123: Throttle / Pedal Position Sensor / Switch "A" Circuit High Input; DTC P0220: Throttle / Pedal Position Sensor / Switch "B" Circuit; DTC P0222: Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input; DTC P0223: Throttle / Pedal Position Sensor / Switch "B" Circuit High Input; DTC P2135: Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation [09/2014 - ]
PCV hose Refer to COMPONENTS [09/2014 - ]
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Hunting (Poor idle) Electronic throttle control system Refer to DTC P0120: Throttle Pedal Position Sensor / Switch "A" Circuit; DTC P0121: Throttle Pedal Position Sensor / Switch "A" Circuit Range / Performance; DTC P0122: Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input; DTC P0123: Throttle / Pedal Position Sensor / Switch "A" Circuit High Input; DTC P0220: Throttle / Pedal Position Sensor / Switch "B" Circuit; DTC P0222: Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input; DTC P0223: Throttle / Pedal Position Sensor / Switch "B" Circuit High Input; DTC P2135: Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation [09/2014 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
PCV hose Refer to COMPONENTS [09/2014 - ]
Mass air flow meter sub-assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Air fuel ratio sensor Refer to INSPECTION [09/2014 - ]
Hesitation/Poor acceleration (Poor driveability) Fuel line -
Fuel pump (for low pressure side) Refer to INSPECTION [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Spark plug Refer to PROCEDURE - Step 3
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
Mass air flow meter sub-assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Valve timing Refer to PROCEDURE - Step 5
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Air intake control circuit Refer to Air Intake Control Circuit [09/2014 - ]
Knock control sensor Refer to INSPECTION [09/2014 - ]
Compression (engine mechanical) Refer to PROCEDURE - Step 10
Brake override system Refer to Brake Override System [09/2014 - 11/2017]
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Lack of power Lack of power Refer to Lack of Power [09/2014 - 11/2017]
Surging (Poor driveability) Spark plug Refer to PROCEDURE - Step 3
Fuel line -
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
Mass air flow meter sub-assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Variable Valve Timing (VVT) system Refer to DTC P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2) [09/2014 - 10/2015] , or refer to DTC P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1); DTC P0021: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2) [10/2015 - 05/2018]
Compression (engine mechanical) Refer to PROCEDURE - Step 10
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Engine stalls soon after starting Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2014 - ]
Fuel pump (for low pressure side) Refer to INSPECTION [09/2014 - ]
Fuel pump (for high pressure side) Refer to INSPECTION [09/2014 - ]
Fuel line -
Spark plug Refer to PROCEDURE - Step 3
Ignition system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2014 - ]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2014 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2014 - ]
Mass air flow meter sub-assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2014 - ]
Engine stalls Refer to Engine Stalls [09/2014 - 11/2017]
Intake system Refer to ON-VEHICLE INSPECTION [09/2014 - ]
PCV valve and hose Refer to INSPECTION [09/2014 - ]
Compression (engine mechanical) Refer to PROCEDURE - Step 10
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2014 - ]
Engine stalls only during air conditioning operation Air conditioning signal circuit Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]
ECM Refer to TERMINALS OF ECM [09/2014 - 11/2017] 
Unable/difficult to refuel Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) -
Drive mode does not change Drive mode select switch circuit Refer to Drive Mode Select Switch Circuit [09/2014 - ]
SNOW mode does not change Pattern select switch snow mode circuit Refer to Pattern Select Switch Snow Mode Circuit [09/2014 - 03/2019]

HINT: 

*: Check "Fuel Cut Elps Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.

Refer to COMPONENTS [09/2014 - ]