NOTE Connect test leads from the back side of the connector The connectors should not be disconnected from the ECM

HINT:

The voltage between the terminals of the ECM is kept constant regardless of the voltage of the A/F sensor.

2006 ENGINE Emission Control - Sequoia

Fig. 61: Measuring Voltage Between Terminals Of ECM Connectors Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Connect a intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM).

2006 ENGINE Emission Control - Sequoia

Then connect the CAN VIM to the Date Link Connector 3 (DLC3).

c. Turn the ignition switch ON.

d. Select the following menu items: Data List / A/FS B1 S1 and O2S B1 S2.

e. Warm up the A/F sensor by running the engine at 2,500 rpm for approximately 2 minutes.

Fig. 62: Connecting Intelligent Tester To Controller Area Network Vehicle Interface Module (CAN VIM) To Date Link Connector 3 (Dlc3) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Keep the engine speed at 2,500 rpm and confirm that the display of the "A/FS B1 S1" is as shown in the illustration.

HINT:

• The illustration may slightly differ from the display on the intelligent tester.

• The waveform of the A/F sensor is displayed only on the intelligent tester.

g. Confirm that the display of the "O2S B1 S2" changes between 0 and 1 V with the engine speed at 2,500 rpm.

2006 ENGINE Emission Control - Sequoia

Fig. 63: Keeping Engine Speed At 2,500 RPM Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

CAUTION:

• Perform the check immediately after warming up the engine.

• If the voltage variation could not be verified, warm up the heated oxygen sensor again. If it could not be verified even after warming up the sensor again, check the DTC No. (See PRECAUTION )

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment