Toyota Avalon (XX50): Problem Symptoms Table. Readiness Monitor Drive Pattern. Registration

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / Problem Symptoms Table. Readiness Monitor Drive Pattern. Registration

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

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	Link
Engine does not crank (Does not start)	Hybrid control system
Engine does not crank (Does not start)	VC output circuit (ECM 5 V output)
No initial combustion (Does not start)	ECM power source circuit
	VC output circuit (ECM 5 V output)
	Ignition system
	Fuel system
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump (for low pressure side)
	Crankshaft position sensor
	Intake system
	Valve timing
	EGR valve assembly
Engine cranks normally but difficult to start	ECM power source circuit
	Throttle body with motor assembly
	Fuel pump assembly (for high pressure side)
	Fuel pump (for low pressure side)
	Engine coolant temperature sensor
	Fuel system
	Ignition system
	Compression
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
	EGR valve assembly
Incomplete intermittent combustion occurs (Does not start)	Fuel system
	Fuel pump (for low pressure side)
	Ignition system
	Port fuel injector assembly
	Direct fuel injector assembly
	Crankshaft position sensor
	Intake system
	Valve timing
High engine speed	Throttle body with motor assembly
	ECM power source circuit
	PCV system
Low engine speed (Poor idle)	Fuel system
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump assembly (for high pressure side)
	PCV system
	Intake system
Rough idle	Flow chart [Rough idling]
	Throttle body with motor assembly
	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel pump assembly (for high pressure side)
	Ignition system
	Air fuel ratio sensor (sensor 1)
	Air fuel ratio sensor (sensor 2)
	Mass air flow meter sub-assembly
	Manifold absolute pressure sensor
	Compression
	Fuel system
	Intake system
	Valve timing
	EGR valve assembly
Hunting (Poor idle)	Throttle body with motor assembly
	ECM power source circuit
	Fuel system
	Spark plug
	Intake system
	Drive start control
Hesitation/Poor acceleration (Poor driveability)	Port fuel injector assembly
	Direct fuel injector assembly
	Fuel system
	Fuel pump assembly (for high pressure side)
	Ignition system
	Intake system
	Valve timing
	Brake override system
	Drive start control
Surging (Poor driveability)	Fuel system
	Fuel pump (for low pressure side)
	Ignition system
	Port fuel injector assembly
	Direct fuel injector assembly
Engine stalls soon after starting	Fuel system
	Throttle body with motor assembly
	Crankshaft position sensor
	Ignition system
	Fuel pump assembly (for high pressure side)
	Intake system
	Valve timing
	EGR valve assembly
MIL (Malfunction Indicator Lamp) malfunction	MIL Circuit
MIL (Malfunction Indicator Lamp) malfunction	Meter/Gauge system
Unable/difficult to refuel	Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.)	-

Readiness Monitor Drive Pattern

READINESS MONITOR DRIVE PATTERN

PURPOSE OF READINESS TESTS

The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission related components, and indicate any detected abnormalities using DTCs (Diagnostic Trouble Codes). Since various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors.
To view the status, enter the following menus: Powertrain / Engine / Monitor / Current Monitor / Current.
When the status of a Readiness Monitor reads Complete, the necessary conditions have been met for running the performance tests for that Readiness Monitor.
A generic OBD II scan tool can also be used to view the Readiness Monitor status.

HINT:

Many state Inspection and Maintenance (I/M) programs require the status of vehicle Readiness Monitor to show Complete before beginning emission tests.

The Readiness Monitor is reset to Incomplete if:

The ECM has lost auxiliary battery power or blown a fuse.
DTCs have been cleared.
The conditions for running the Readiness Monitor have not been met.

If the Readiness Monitor status shows Incomplete, follow the appropriate Readiness Monitor Drive Pattern to change the status to Complete.

CAUTION:

Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns.

NOTICE:

These drive patterns represent the fastest method of satisfying all conditions necessary to achieve complete status for each specific Readiness Monitor.

In the event of a drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed. In most cases, the Readiness Monitor will still achieve complete status upon completion of the drive pattern.

To ensure completion of the Readiness Monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).

VVT SYSTEM MONITOR

(a) Refer to Confirmation Driving Pattern [P001100].

Click here

(b) Refer to Confirmation Driving Pattern [P001200].

Click here

CATALYST MONITOR (ACTIVE AIR FUEL RATIO CONTROL TYPE)

(a) Refer to Confirmation Driving Pattern [P042000].

Click here

EVAP SYSTEM MONITOR (KEY OFF TYPE)

(a) Refer to Confirmation Driving Pattern [EVAP System].

Click here

AIR FUEL RATIO (A/F) SENSOR MONITORS (ACTIVE AIR FUEL RATIO CONTROL TYPE)

(a) Refer to Confirmation Driving Pattern [P00D562].

Click here

(b) Refer to Confirmation Driving Pattern [P013616].

Click here

(d) Refer to Confirmation Driving Pattern [P219519].

Click here

(e) Refer to Confirmation Driving Pattern [P227019].

Click here

AIR FUEL RATIO (A/F) IMBALANCE MONITOR

(a) Refer to Confirmation Driving Pattern [P11EA00].

Click here

EGR SYSTEM MONITOR

(a) Refer to Confirmation Driving Pattern [P04019C].

Click here

Registration

REGISTRATION

CAUTION / NOTICE / HINT

PROCEDURE

1. VIN (VEHICLE IDENTIFICATION NUMBER)

NOTICE:

The Vehicle Identification Number (VIN) must be written to a replacement ECM.

HINT:

The VIN is a 17-digit alphanumeric vehicle identification number. The Techstream is required to register the VIN.

(a) DESCRIPTION

HINT:

This registration section consists of 2 parts: Read VIN and Write VIN.

(1) Read VIN: This procedure allows the VIN stored in the ECM to be read in order to confirm that the 2 VINs, provided with the vehicle and stored in the vehicle ECM, are the same.

(2) Write VIN: This procedure allows the VIN to be written into the ECM. If the ECM is replaced, or the ECM VIN and vehicle VIN do not match, the VIN can be registered, or overwritten in the ECM by following this procedure.

(b) READ VIN

(1) Confirm the vehicle VIN.

(2) Connect the Techstream to the DLC3.

(3) Turn the power switch on (IG).

(4) Turn the Techstream on.

(5) Enter the following menus: Powertrain / Engine / Utility / VIN / VIN Read.

Powertrain > Engine > Utility

Tester Display
VIN

(6) According to the display on the Techstream, read the VIN stored in the ECM.

(1) Confirm the vehicle VIN.

(2) Connect the Techstream to the DLC3.

(3) Turn the power switch on (IG).

(4) Turn the Techstream on.

(5) Enter the following menus: Powertrain / Engine / Utility / VIN / VIN Write.

Powertrain > Engine > Utility

Tester Display
VIN

(6) According to the display on the Techstream, write the VIN to the ECM.

Fuel Run Out (P319300). Parts Location. Precaution

Rough Idling

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