On-Vehicle Inspection

1NZ-FXE EMISSION CONTROL: AIR FUEL RATIO SENSOR: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM





(a) Inspect the voltage.
(1) Turn the power switch ON (IG).
(2) Using a voltmeter, measure the voltage between the ECM terminals.
Standard voltage:





NOTE: Connect the test leads from the backside of the connector with the ECM connector connected.
HINT: The voltage between the ECM terminals is constant regardless of the output voltage of the air-fuel ratio sensor.

If the result is not as specified, check the air-fuel ratio sensor and wire harness.
(b) Check the output waveform.
(1) Set the vehicle to inspection mode Component Tests and General Diagnostics.
(2) Connect Techstream to the DLC3.
(3) Turn the power switch ON (READY).
(4) Turn Techstream ON.
(5) Enter the following menus: Powertrain / Engine and ECT / Data List /AFS B1 S1, O2S B1 S2.
(6) Warm up the air fuel ratio sensor for approximately 2 minutes at 2500 rpm of the engine speed.




(7) Maintain the engine speed at 2500 rpm, then check that the waveform of "AFS B1 S1" is output as illustrated.
HINT:
- The waveform of illustration is a sample.
- Only the Techstream shows the waveform of the air fuel ratio sensor.
(8) Check that "O2S B1 S2" fluctuates between 0 and 1 V with the engine speed at 2500 rpm.