Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTESTING AND INSPECTIONON-VEHICLE INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
On-Vehicle Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION On-Vehicle Inspection
ON-VEHICLE INSPECTION
1. INSPECT AIR FUEL RATIO SENSOR
a. Disconnect the air fuel ratio sensor connector.
b. Using an ohmmeter, measure the resistance between terminals +B and HT.
Resistance: 11 to 16 kOhms at 20 degree C (68 degree F)
If the resistance is not as specified, replace the sensor.
Torque: 44 N.m (450 kgf.cm, 32 ft.lbf)
c. Reconnect the air fuel ratio sensor connector.
2. INSPECT AIR FUEL RATIO COMPENSATION SYSTEM
a. Measure the voltage between the terminals of the ECM connectors.
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.
b. Connect a intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data 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.
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.
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.
1. INSPECT AIR FUEL RATIO SENSOR
a. Disconnect the air fuel ratio sensor connector.
b. Using an ohmmeter, measure the resistance between terminals +B and HT.
Resistance: 11 to 16 kOhms at 20 degree C (68 degree F)
If the resistance is not as specified, replace the sensor.
Torque: 44 N.m (450 kgf.cm, 32 ft.lbf)
c. Reconnect the air fuel ratio sensor connector.
2. INSPECT AIR FUEL RATIO COMPENSATION SYSTEM
a. Measure the voltage between the terminals of the ECM connectors.
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.
b. Connect a intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data 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.
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.
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.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.