Toyota Sienna Service Manual: On-vehicle inspection

Toyota Sienna Service Manual / Engine / 2Gr-fe emission control / Air fuel ratio sensor (for 4wd) / On-vehicle inspection

HINT: The type of ignition switch on this model differs according to the specifications of the vehicle. For the expressions used in this section, refer to the "EXPRESSIONS OF IGNITION SWITCH" precaution (See page ES-1).

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM

(a) Connect the intelligent tester to the DLC3.

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

(d) Warm up the A/F sensor with the engine speed at 2500 rpm for approximately 2 minutes.

(e) Keep the engine speed at 2500 rpm and confirm that the "A/FS B1 S1" and "A/FS BS S1" display is as shown in the illustration.

CHECK AIR FUEL RATIO COMPENSATION SYSTEM

HINT:

The illustration may slightly differ from the display on the intelligent tester.
Only the intelligent tester displays the waveform of the A/F sensor.
On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL
The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%
The sensors react in accordance with increases and decreases in the fuel injection volume.

Standard

NOTICE: The A/F sensor has an output delay of a few seconds.

(f) Confirm that the "O2S B1 S2" and "A/FS BS S1" display changes between 0 to 1 V with the engine speed at 2500 rpm.

OK: The voltage output oscillates more than 8 times in 10 seconds.

NOTICE:

Perform the check immediately after warming the engine up.
If the voltage variation could not be verified, warm up the A/F sensor again. If it could not be verified even after warming up the sensor again, check for DTCs (See page ES-39).

Air fuel ratio sensor (for 4wd)

Components ...

Removal

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINALV Caution: wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat ...

Other materials:

Data list / active test
HINT: By accessing the DATA LIST displayed by the intelligent tester, you can perform such functions as reading the values of switches and sensors without removing any parts. Reading the DATA LIST as the first step in troubleshooting is one method to shorten labor time. 1. DATA LIST FOR OCCUPA ...

Problem symptoms table
HINT: Before performing verification listed in the table below, check the fuse and relay. Check the circuits for each problem symptom in the order given in the table below, and proceed to the relevant page. CLEARANCE SONAR SYSTEM: *1: with Front Clearance Sonar *2: wit ...

MPX Body ECU Stop
DTC B1200 MPX Body ECU Stop DESCRIPTION This DTC is detected when communication between the multiplex network body ECU and the multiplex network gateway ECU stops for more than 10 seconds. DTC No. DTC Detection Condition Trouble Area B1200 Body ECU comm ...