Problem Symptoms Table [08/2017 - 08/2018]

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. 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	Go to
Engine does not crank (Does not start)	Battery	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Starter	Refer to INSPECTION [08/2015 - 08/2018]
	Starter relay	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Cranking holding function circuit	Refer to Cranking Holding Function Circuit [08/2017 - 08/2018]
	Park/Neutral position switch	Refer to INSPECTION [08/2015 - ]
	VC output circuit	Refer to VC Output Circuit [08/2017 - 08/2018]
	Immobilizer system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2018]
No initial combustion (Does not start)	ECM power source circuit	Refer to ECM Power Source Circuit [08/2017 - 08/2018]
	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 [08/2017 - 08/2018]
	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) [08/2017 - 08/2018]
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Fuel Injector Circuit	Refer to Fuel Injector Circuit [08/2017 - 08/2018]
	ECM	Refer to TERMINALS OF ECM [08/2017 - 08/2018]
	VC output circuit	Refer to VC Output Circuit [08/2017 - 08/2018]
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Immobilizer system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Engine cranks normally but difficult to start	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Compression	Refer to PROCEDURE - Step 10
	PCV hose	Refer to PROCEDURE - Step 2
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	ECM power source circuit	Refer to ECM Power Source Circuit [08/2017 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Difficult to start with cold engine	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Spark plug	Refer to PROCEDURE - Step 3
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
Difficult to start with warm engine	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Spark plug	Refer to PROCEDURE - Step 3
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
High engine idle speed	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	A/C signal circuit	Refer to TERMINALS OF ECU [08/2017 - 08/2019]
	ECM power source circuit	Refer to ECM Power Source Circuit [08/2017 - 08/2018]
	Acoustic Control Induction System (ACIS)	Refer to ACIS Control Circuit [08/2017 - 08/2018]
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
Low engine idle speed (Poor idling)	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	A/C signal circuit	Refer to TERMINALS OF ECU [08/2017 - 08/2019]
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Air induction system	Refer to PROCEDURE - Step 4
	Acoustic Control Induction System (ACIS)	Refer to ACIS Control Circuit [08/2017 - 08/2018]
	PCV hose	Refer to PROCEDURE - Step 2
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
Rough idling	Compression	Refer to PROCEDURE - Step 10
	Spark plug	Refer to PROCEDURE - Step 3
	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Air induction system	Refer to PROCEDURE - Step 4
	Acoustic Control Induction System (ACIS)	Refer to ACIS Control Circuit [08/2017 - 08/2018]
	PCV hose	Refer to PROCEDURE - Step 2
	Mass air flow meter	Refer to INSPECTION [08/2015 - 08/2018]
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Idle hunting	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Air induction system	Refer to PROCEDURE - Step 4
	ECM power source circuit	Refer to ECM Power Source Circuit [08/2017 - 08/2018]
	Acoustic Control Induction System (ACIS)	Refer to ACIS Control Circuit [08/2017 - 08/2018]
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Drive start control system	Refer to Drive Start Control System [08/2017 - 08/2018]
Hesitation/Poor acceleration	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Spark plug	Refer to PROCEDURE - Step 3
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Mass air flow meter	Refer to INSPECTION [08/2015 - 08/2018]
	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Air induction system	Refer to PROCEDURE - Step 4
	Compression	Refer to PROCEDURE - Step 10
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Brake override system	Refer to Brake Override System [08/2017 - 08/2018]
	Drive start control system	Refer to Drive Start Control System [08/2017 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Surging (Poor driveability)	Spark plug	Refer to PROCEDURE - Step 3
	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Mass air flow meter	Refer to INSPECTION [08/2015 - 08/2018]
	Variable valve timing system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Compression	Refer to PROCEDURE - Step 10
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Engine stalls soon after starting	Fuel pump control circuit	Refer to Fuel Pump Control Circuit [08/2017 - 08/2018]
	Spark plug	Refer to PROCEDURE - Step 3
	Ignition system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Fuel injector	Refer to INSPECTION [08/2015 - 08/2018]
	Variable valve timing system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Electronic throttle control system	Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2018]
	Air induction system	Refer to PROCEDURE - Step 4
	PCV hose	Refer to PROCEDURE - Step 2
	Compression	Refer to PROCEDURE - Step 10
	Fuel pressure switching system	Refer to Fuel Pressure Switching System [08/2017 - 08/2018]
	Alcohol concentration	Refer to DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2) [08/2015 - 08/2018]
Engine stalls only during A/C operation	A/C signal circuit	Refer to TERMINALS OF ECU [08/2017 - 08/2019]
Engine stalls only during A/C operation	ECM	Refer to TERMINALS OF ECM [08/2017 - 08/2018]
Unable/difficult to refuel	Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.)	-
MIL (malfunction indicator lamp) malfunction	MIL Circuit	Refer to MIL Circuit [08/2017 - 08/2018]
MIL (malfunction indicator lamp) malfunction	Meter/Gauge system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ]

HINT:

Due to the factors listed below, cold engine starting trouble, rough idle, poor driveability, and engine stall may occur:

The vehicle is filled with fuel that has an alcohol concentration of 100% (E100).
The Data List item "Alcohol Density Learning" on the Techstream is "Incmpl" (if "Alcohol Density Learning" is "Incmpl", this means that the alcohol concentration learning has not been completed).
"Alcohol Density Learning" does not change to "Incmpl" even though the vehicle is refueled (if the amount refueled is 2 gallons or less, or the fuel sender gauge is malfunctioning, "Alcohol Density Learning" may not change to "Incmpl"). The ECM does not perform alcohol concentration learning if "Alcohol Density Learning" does not change to "Incmpl". If alcohol concentration learning is not performed, the ECM cannot command the injectors to inject the appropriate amount of fuel for combustion.