Problem Symptoms Table [09/2014 - 10/2015]

WARNING: This page is about a different car, the 2015 Lexus GS 350. 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	Reference
Engine does not crank (Does not start)	Battery	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Starter relay	Refer to PROCEDURE - Step 6
	Starter assembly	Refer to INSPECTION [09/2014 - 10/2015]
	VC output circuit (ECM 5 V output)	Refer to VC Output Circuit [09/2014 - 10/2015]
	Starter signal circuit	Refer to Starter Signal Circuit [09/2014 - 10/2015]
	Smart access system with push-button start (for start function)	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]
	Park/neutral position switch assembly (for AA81E)	Refer to INSPECTION [09/2014 - ]
	Park/neutral position switch assembly (for A760H)	Refer to INSPECTION [09/2014 - ]
No initial combustion (Does not start)	Immobiliser system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
	VC output circuit (ECM 5 V output)	Refer to VC Output Circuit [09/2014 - 10/2015]
	Crankshaft position sensor	Refer to INSPECTION [09/2014 - 10/2015]
	VVT sensor	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) [09/2014 - 10/2015]
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	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 [09/2014 - 10/2015]
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Valve timing	Refer to PROCEDURE - Step 4
	Starter signal circuit	Refer to Starter Signal Circuit [09/2014 - 10/2015]
	ECM	Refer to TERMINALS OF ECM [09/2014 - 10/2015]
Engine cranks normally but difficult to start	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Engine coolant temperature sensor	Refer to INSPECTION [09/2014 - 10/2015]
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for port injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for direct injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Compression	Refer to PROCEDURE - Step 10
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Throttle body assembly	Refer to INSPECTION [09/2014 - 10/2015]
	PCV hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Starter signal circuit	Refer to Starter Signal Circuit [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
Incomplete intermittent combustion occurs (Does not start)	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel line	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel pump	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for port injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for direct injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Crankshaft position sensor	Refer to INSPECTION [09/2014 - 10/2015]
	VVT sensor	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) [09/2014 - 10/2015]
	Valve timing	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Starter signal circuit	Refer to Starter Signal Circuit [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
High engine speed (Poor idle)	A/C signal circuit	Refer to TERMINALS OF ECU [09/2014 - 10/2015]
	Throttle body assembly	Refer to INSPECTION [09/2014 - 10/2015]
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Engine coolant temperature sensor	Refer to INSPECTION [09/2014 - 10/2015]
	PCV hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	PCV system	Refer to INSPECTION [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
Low engine speed (Poor idle)	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Throttle body assembly	Refer to INSPECTION [09/2014 - 10/2015]
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	PCV hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
Rough idle	Compression (engine mechanical)	Refer to PROCEDURE - Step 10
	Air fuel ratio sensor	Refer to INSPECTION [09/2014 - 10/2015]
	Heated oxygen sensor	Refer to INSPECTION [09/2014 - 10/2015]
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	A/C signal circuit	Refer to TERMINALS OF ECU [09/2014 - 10/2015]
	Fuel injector assembly (for port injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for direct injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel line	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel pump	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	PCV hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
Hunting (Poor idle)	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
	PCV hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Air fuel ratio sensor	Refer to INSPECTION [09/2014 - 10/2015]
Hesitation/Poor acceleration (Poor driveability)	Fuel line	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel pump	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Spark plug	Refer to PROCEDURE - Step 3
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for port injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for direct injection)	Refer to INSPECTION [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Throttle body assembly	Refer to INSPECTION [09/2014 - 10/2015]
	Knock control sensor	Refer to INSPECTION [09/2014 - 10/2015]
	Compression	Refer to PROCEDURE - Step 10
	Brake override system	Refer to Brake Override System [09/2014 - 10/2015]
Surging (Poor driveability)	Spark plug	Refer to PROCEDURE - Step 3
	Fuel line	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel injector for port injection	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector for direct injection	Refer to INSPECTION [09/2014 - 10/2015]
	ECM power source circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Variable Valve Timing (VVT) system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Compression	Refer to PROCEDURE - Step 10
Engine stalls soon after starting	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [09/2014 - 10/2015]
	Fuel pump	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel pump (for high pressure)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel line	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Spark plug	Refer to PROCEDURE - Step 3
	Ignition system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for port injection)	Refer to INSPECTION [09/2014 - 10/2015]
	Fuel injector assembly (for direct injection)	Refer to INSPECTION [09/2014 - 10/2015]
	ECM Power Source Circuit	Refer to ECM Power Source Circuit [09/2014 - 10/2015]
	Mass air flow meter	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Variable Valve Timing (VVT) system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Throttle body assembly	Refer to INSPECTION [09/2014 - 10/2015]
	Intake system	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	PCV valve and hose	Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015]
	Compression	Refer to PROCEDURE - Step 10
Engine stalls only during A/C operation	A/C signal circuit	Refer to TERMINALS OF ECU [09/2014 - 10/2015]
Engine stalls only during A/C operation	ECM	Refer to TERMINALS OF ECM [09/2014 - 10/2015]
Unable/difficult to refuel	Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.)	-
SNOW mode does not change	Pattern select switch snow mode circuit	Refer to Pattern Select Switch Snow Mode Circuit [09/2014 - 10/2015]