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Home >> Lexus >> 2020 >> RX 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Diagnostics - Introduction (1 Of 5) >> SFI System >> Problem Symptoms Table [09/2015 - 12/2017] >> Problem Symptoms Table [09/2015 - 12/2017]
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Problem Symptoms Table [09/2015 - 12/2017]

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 [09/2015 - ]
Starter assembly Refer to INSPECTION [09/2015 - 08/2019]
Starter signal circuit Refer to Starter Signal Circuit [09/2015 - ]
Smart access system with push-button start (for start function) Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ]
VC output circuit (ECM 5 V output) Refer to VC Output Circuit [09/2015 - ]
Park/neutral position switch assembly (for 2WD models) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Park/neutral position switch assembly (for AWD models) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
No initial combustion (Does not start) Immobilizer system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2015 - ]
VC output circuit (ECM 5 V output) Refer to VC Output Circuit [09/2015 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Crankshaft position sensor Refer to DTC P0335-11: Crankshaft Position Sensor "A" Circuit Short to Ground; DTC P0335-15: Crankshaft Position Sensor "A" Circuit Short to Battery or Open; DTC P0335-1F: Crankshaft Position Sensor "A" Circuit Intermittent; DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [09/2015 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2015 - ]
Engine cranks normally but difficult to start ECM power source circuit Refer to ECM Power Source Circuit [09/2015 - ]
Flow chart [Engine difficult to start] Refer to Engine Difficult to Start [09/2015 - 08/2018]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel pump assembly (for high pressure side) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel pump (for low pressure side) (for TMC made) Refer to INSPECTION [09/2015 - ]
Fuel pump (for low pressure side) (for TMMC made) Refer to INSPECTION [09/2015 - ]
Engine coolant temperature sensor Refer to INSPECTION [09/2015 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Spark plug Refer to PROCEDURE - Step 3
Compression Refer to PROCEDURE - Step 11 [09/2015 - 08/2016] , or refer to PROCEDURE - Step 11 [08/2016 - 08/2019]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Crankshaft position sensor Refer to DTC P0335-11: Crankshaft Position Sensor "A" Circuit Short to Ground; DTC P0335-15: Crankshaft Position Sensor "A" Circuit Short to Battery or Open; DTC P0335-1F: Crankshaft Position Sensor "A" Circuit Intermittent; DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [09/2015 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2015 - ]
Incomplete intermittent combustion occurs (Does not start) Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Crankshaft position sensor Refer to DTC P0335-11: Crankshaft Position Sensor "A" Circuit Short to Ground; DTC P0335-15: Crankshaft Position Sensor "A" Circuit Short to Battery or Open; DTC P0335-1F: Crankshaft Position Sensor "A" Circuit Intermittent; DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [09/2015 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
High engine speed Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2015 - ]
PCV hose Refer to COMPONENTS [09/2015 - ]
PCV system Refer to INSPECTION [09/2015 - ]
Low engine speed (Poor idle) Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Fuel pump assembly (for high pressure side) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
PCV hose Refer to COMPONENTS [09/2015 - ]
PCV system Refer to INSPECTION [09/2015 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Rough idle Flow chart [Rough idling] Refer to Rough Idling [09/2015 - 08/2018]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Fuel pump assembly (for high pressure side) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Compression Refer to PROCEDURE - Step 11 [09/2015 - 08/2016] , or refer to PROCEDURE - Step 11 [08/2016 - 08/2019]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Spark plug Refer to PROCEDURE - Step 3
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2015 - ]
Hunting (Poor idle) Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
ECM power source circuit Refer to ECM Power Source Circuit [09/2015 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Spark plug Refer to PROCEDURE - Step 3
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Drive start control system Refer to Drive Start Control System [09/2015 - 12/2017]
Hesitation/Poor acceleration (Poor driveability) Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Fuel pump assembly (for high pressure side) Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Spark plug Refer to PROCEDURE - Step 3
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2015 - ]
Brake override system Refer to Brake Override System [09/2015 - 08/2019]
Drive start control system Refer to Drive Start Control System [09/2015 - 12/2017]
Lack of power Flow chart [Lack of power] Refer to Lack of Power [09/2015 - 08/2018]
Surging (Poor driveability) Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Spark plug Refer to PROCEDURE - Step 3
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
No. 1 valve rocker arm sub-assembly* Refer to COMPONENTS [09/2015 - ]
Engine stalls soon after starting Flow chart [Engine stalls] Refer to Engine Stalls [09/2015 - 08/2018]
Fuel pump control circuit Refer to Fuel Pump Control Circuit [09/2015 - 12/2017]
Throttle body with motor assembly Refer to INSPECTION [09/2015 - ]
Crankshaft position sensor Refer to DTC P0335-11: Crankshaft Position Sensor "A" Circuit Short to Ground; DTC P0335-15: Crankshaft Position Sensor "A" Circuit Short to Battery or Open; DTC P0335-1F: Crankshaft Position Sensor "A" Circuit Intermittent; DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [09/2015 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
Fuel pump assembly (for high pressure side) Refer to INSPECTION [09/2015 - ]
Intake system Refer to ON-VEHICLE INSPECTION [09/2015 - 12/2017]
Valve timing Refer to PROCEDURE - Step 6
Engine stalls soon after slow down Flow chart [Engine stalls] Refer to Engine Stalls [09/2015 - 08/2018]
Fuel injector assembly (for port injection) Refer to INSPECTION [09/2015 - 12/2017]
Fuel injector assembly (for direct injection) Refer to INSPECTION [09/2015 - ]
Throttle body with motor assembly Refer to ON-VEHICLE INSPECTION [09/2015 - ]
ECM Refer to TERMINALS OF ECM [09/2015 - 08/2016] , or refer to TERMINALS OF ECM [08/2016 - 12/2017] 
Crankshaft position sensor Refer to DTC P0335-11: Crankshaft Position Sensor "A" Circuit Short to Ground; DTC P0335-15: Crankshaft Position Sensor "A" Circuit Short to Battery or Open; DTC P0335-1F: Crankshaft Position Sensor "A" Circuit Intermittent; DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [09/2015 - ]
Ignition system Refer to ON-VEHICLE INSPECTION [09/2015 - ]
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 [09/2015 - ]

HINT: 

*: Check "Fuel Cut Elapsed 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 [09/2015 - ]