Toyota Sienna Service Manual: Air-fuel ratio (a/f) and heated oxygen (ho2) sensor heater monitors (front a/f and rear ho2 sensor type)

Toyota Sienna Service Manual / Engine / 2Gr-fe engine control system / Sfi system / Readiness monitor drive pattern / Air-fuel ratio (a/f) and heated oxygen (ho2) sensor heater monitors (front a/f and rear ho2 sensor type)

Air-fuel ratio (a/f) and heated oxygen (ho2) sensor heater monitors (front a/f and rear ho2 sensor type)

(a) Preconditions

The monitor will not run unless:

The MIL is OFF.

(b) Drive Pattern

(1) Connect an intelligent tester to the DLC3.

(2) Turn the ignition switch to the ON position.

(3) Clear the DTCs.

(4) Start the engine.

(5) Allow the engine to idle for 10 minutes or more.

(6) Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes.

(1) Check the Readiness Monitor status displayed on the tester or scan tool.

If the status does not switch to COMPL (complete), make sure that the preconditions have been met, and repeat the Drive Pattern.

A/F sensor and ho2s monitors

(a) Preconditions The monitor will not run unless: 2 minutes or more have elapsed since the engine was started. The Engine Coolant Temperature (ECT) is 75°C (167°F) or more. Cumulative ...

Problem symptoms table

HINT: When a malfunction is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshoot according to the priority ...

Other materials:

How to proceed with troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 CHECK INITIAL CHECK FUNCTION 4 PROBLEM SYMPTOMS TABLE THE CORRESPONDING SYSTEM DOES NOT EXIST (Go to step 5) 5 BASED ON THE MALFUNCTION SYMPTOM, PERFORM THE TROUBLESHOOTING BELOW Operation check (C). Terminals of ECU 6 ...

Front Fog Light Circuit
DESCRIPTION The Multiplex network body ECU controls FOG relay when signal is received from headlight dimmer switch assembly. WIRING DIAGRAM INSPECTION PROCEDURE 1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to DLC3. Turn the ignition switch ON and push t ...

Back Door ECU Communication Stop
DTC B1287 Back Door ECU Communication Stop DESCRIPTION DTC B1287 is output when communication between the power back door ECU and the multiplex network gateway ECU stops for more than 10 seconds. DTC No. DTC Detection Condition Trouble Area B1287 Back d ...