Problem Symptoms Table

WARNING: This page is about a different car, the 2011 Lexus IS F. 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 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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

SFI SYSTEM

Symptom	Suspected Area	Refer to
Engine does not crank (Does not start)	Smart access system with push-button start	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	Immobiliser system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	ECM power source circuit	Refer to ECM Power Source Circuit
	VC output circuit	Refer to VC Output Circuit
	Cranking holding function circuit	Refer to Cranking Holding Function Circuit
	Starter	Refer to INSPECTION
No initial combustion (Does not start)	ECM power source circuit	Refer to ECM Power Source Circuit
	VC output circuit	Refer to VC Output Circuit
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit
	Crankshaft position sensor	Refer to ON-VEHICLE INSPECTION
	Ignition system	Refer to ON-VEHICLE INSPECTION
	Fuel injector circuit	Refer to DTC P0201: Injector Circuit / Open - (Cylinder 1); DTC P0202: Injector Circuit / Open - (Cylinder 2); DTC P0203: Injector Circuit / Open - (Cylinder 3); DTC P0204: Injector Circuit / Open - (Cylinder 4); DTC P0205: Injector Circuit / Open - (Cylinder 5); DTC P0206: Injector Circuit / Open - (Cylinder 6); DTC P0207: Injector Circuit / Open - (Cylinder 7); DTC P0208: Injector Circuit / Open - (Cylinder 8); DTC P062D: Fuel Injector Driver Circuit Performance Bank1; DTC P062E: Fuel Injector Driver Circuit Performance Bank2
	Valve timing	Refer to PROCEDURE - Step 3
Engine cranks normally but difficult to start	Fuel pump control circuit	Refer to Fuel Pump Control Circuit
	Fuel pump for high pressure	Refer to ON-VEHICLE INSPECTION
	Compression	Refer to ON-VEHICLE INSPECTION - Step 9
	Engine coolant temperature sensor	Refer to INSPECTION
	Ignition system	Refer to ON-VEHICLE INSPECTION
	Fuel injector circuit	Refer to DTC P1276: Port Injector Circuit No. 1; DTC P1277: Port Injector Circuit No. 2; DTC P1278: Port Injector Circuit No. 3; DTC P1279: Port Injector Circuit No. 4; DTC P127A: Port Injector Circuit No. 5; DTC P127B: Port Injector Circuit No. 6; DTC P127C: Port Injector Circuit #7; DTC P127D: Port Injector Circuit #8
	Intake system	Refer to ON-VEHICLE INSPECTION
	Throttle body	Refer to ON-VEHICLE INSPECTION
	ECM power source circuit	Refer to ECM Power Source Circuit
Incomplete intermittent combustion occurs (Does not start)	Fuel pump control circuit	Refer to Fuel Pump Control Circuit
	Ignition system	Refer to ON-VEHICLE INSPECTION
	Fuel line	-
	Fuel injector for direct injection	Refer to INSPECTION
	Fuel injector for port injection	Refer to INSPECTION
	Crankshaft position sensor	Refer to ON-VEHICLE INSPECTION
High engine speed (Poor idle)	Air conditioning signal circuit	Refer to PROBLEM SYMPTOMS TABLE
	Throttle body	Refer to ON-VEHICLE INSPECTION
	Throttle body control	-
	Engine coolant temperature sensor	Refer to INSPECTION
	PCV hose	Refer to ON-VEHICLE INSPECTION
	PCV system	Refer to ON-VEHICLE INSPECTION
Low engine idle speed (Poor idle)	Fuel pump control circuit	Refer to Fuel Pump Control Circuit
	Fuel pump for high pressure	Refer to ON-VEHICLE INSPECTION
	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
	Intake system	Refer to ON-VEHICLE INSPECTION
	PCV hose	Refer to ON-VEHICLE INSPECTION
Rough idle	Compression	Refer to ON-VEHICLE INSPECTION - Step 9
	Air fuel ratio sensor	Refer to ON-VEHICLE INSPECTION
	Heated oxygen sensor	Refer to ON-VEHICLE INSPECTION
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION
	Ignition system	Refer to ON-VEHICLE INSPECTION
	Air conditioning signal circuit	Refer to PROBLEM SYMPTOMS TABLE
	Fuel line (clocked)	-
	Fuel pump for high pressure	Refer to ON-VEHICLE INSPECTION
	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
	Intake system	Refer to ON-VEHICLE INSPECTION
	PCV hose	Refer to ON-VEHICLE INSPECTION
Hunting (Poor idle)	PCV hose	Refer to ON-VEHICLE INSPECTION
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION
	Air fuel ratio sensor	Refer to ON-VEHICLE INSPECTION
Hesitation/Poor acceleration (Poor driveability)	Fuel line	-
	Fuel pump for high pressure	Refer to ON-VEHICLE INSPECTION
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION
	Valve timing	Refer to PROCEDURE - Step 3
	Throttle body	Refer to ON-VEHICLE INSPECTION
	Knock sensor	Refer to INSPECTION
	Brake override system	Refer to Brake Override System
Surging (Poor driveability)	Fuel line	-
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit
	Fuel pump for high pressure	Refer to ON-VEHICLE INSPECTION
	Ignition system	Refer to ON-VEHICLE INSPECTION
	Fuel injector for port injection	Refer to INSPECTION
	Fuel injector for direct injection	Refer to INSPECTION
Engine stalls soon after starting	Mass air flow meter	Refer to ON-VEHICLE INSPECTION
	Intake system	Refer to ON-VEHICLE INSPECTION
	Fuel line	-
Engine stalls during A/C operation	Air conditioning signal circuit (compressor circuit)	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
Engine stalls during A/C operation	ECM	Refer to REMOVAL
Unable/difficult to refuel	Refueling valve (canister)	Refer to INSPECTION