LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> LS 460 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Engine Control System (Diagnostics - Introduction)) >> SFI System >> Problem Symptoms Table >> Problem Symptoms Table
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Problem Symptoms Table

WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.

HINT: 

Use the table below to help determine the cause of the problem symptom. 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

Symptom Suspected Area See
Engine does not crank (Does not start) 1. Immobilizer system Refer to PROBLEM SYMPTOMS TABLE
2. Hybrid system Refer to HOW TO PROCEED WITH TROUBLESHOOTING
3. Shift lever position sensor Refer to ON-VEHICLE INSPECTION
No initial combustion (Does not start) 1. ECM power source circuit Refer to ECM Power Source Circuit
2. Crankshaft position sensor Refer to INSPECTION
3. VVT sensor (for intake side) Refer to DTC P0340: Camshaft Position Sensor Circuit Malfunction; 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)
4. VVT sensor (for exhaust side) 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)
5. Ignition system Refer to ON-VEHICLE INSPECTION
6. Fuel pump control circuit Refer to Fuel Pump Control Circuit
7. ECM Refer to REMOVAL
8. VC output circuit Refer to VC Output Circuit
Engine cranks normally but difficult to start 1. Fuel pump control circuit Refer to Fuel Pump Control Circuit
2. Compression Refer to ON-VEHICLE INSPECTION - Step 4
Difficult to start with cold engine 1. Ignition system Refer to ON-VEHICLE INSPECTION
2. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
3. Fuel pump control circuit Refer to Fuel Pump Control Circuit
4. Fuel injector (for port injection) Refer to INSPECTION
5. Fuel injector (for direct injection) Refer to INSPECTION
Difficult to start with warm engine 1. Fuel injector (for port injection) Refer to INSPECTION
2. Fuel injector (for direct injection) Refer to INSPECTION
3. Ignition system Refer to ON-VEHICLE INSPECTION
4. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
5. Fuel pump control circuit Refer to Fuel Pump Control Circuit
High engine idle speed 1. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
2. ECM power source circuit Refer to ECM Power Source Circuit
Low engine idle speed (Poor idling) 1. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
2. Fuel pump control circuit Refer to Fuel Pump Control Circuit
3. Air induction system Refer to ON-VEHICLE INSPECTION
4. Ventilation hose -
Rough idling 1. Compression Refer to ON-VEHICLE INSPECTION - Step 4
2. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
3. Fuel injector (for port injection) Refer to INSPECTION
4. Fuel injector (for direct injection) Refer to INSPECTION
5. Ignition system Refer to ON-VEHICLE INSPECTION
6. Fuel pump control circuit Refer to Fuel Pump Control Circuit
7. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
8. Air induction system Refer to ON-VEHICLE INSPECTION
9. Ventilation hose -
10. Mass air flow meter Refer to ON-VEHICLE INSPECTION
Idle hunting 1. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
2. Air induction system Refer to ON-VEHICLE INSPECTION
3. ECM power source circuit Refer to ECM Power Source Circuit
Hesitation/Poor acceleration 1. Fuel pump control circuit Refer to Fuel Pump Control Circuit
2. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
3. Ignition system Refer to ON-VEHICLE INSPECTION
4. Fuel injector (for port injection) Refer to INSPECTION
5. Fuel injector (for direct injection) Refer to INSPECTION
6. Mass air flow meter Refer to ON-VEHICLE INSPECTION
7. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
8. Air induction system Refer to ON-VEHICLE INSPECTION
9. Compression Refer to ON-VEHICLE INSPECTION - Step 4
Surging (Poor driveability) 1. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
2. Fuel pump control circuit Refer to Fuel Pump Control Circuit
3. Ignition system Refer to ON-VEHICLE INSPECTION
4. Fuel injector (for port injection) Refer to INSPECTION
5. Fuel injector (for direct injection) Refer to INSPECTION
6. Mass air flow meter Refer to ON-VEHICLE INSPECTION
7. Variable valve timing system Refer to DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1); DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2)
8. Compression Refer to ON-VEHICLE INSPECTION - Step 4
Engine stalls soon after starting 1. Fuel pump control circuit Refer to Fuel Pump Control Circuit
2. Spark plug Refer to ON-VEHICLE INSPECTION - Step 2
3. Ignition system Refer to ON-VEHICLE INSPECTION
4. Fuel injector (for port injection) Refer to INSPECTION
5. Fuel injector (for direct injection) Refer to INSPECTION
6. Variable valve timing system Refer to DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1); DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2)
7. Electronic throttle control system Refer to DTC P0120: Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction; DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem; 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
8. Air induction system Refer to ON-VEHICLE INSPECTION
9. Ventilation hose -
10. Compression Refer to ON-VEHICLE INSPECTION - Step 4
Unable/difficult to refuel 1. Refueling valve (canister) Refer to INSPECTION
scientia non olet · About LEMON Manuals