Conditioning For Sensor Testing
HINT:
Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio and heated oxygen sensors. This is in order to activate the sensors sufficiently to obtain the appropriate inspection results.
- Connect the Techstream to the DLC3 [A].
- Turn the power switch on (IG) and turn the Techstream on [A].
- Put the engine in inspection mode (maintenance mode) (See servic information).Refer to INSPECTION MODE PROCEDURE [09/2014 - 10/2015] ) [A].
- Start the engine and warm it up with all the accessories switched off and the shift lever in P, until the engine coolant temperature stabilizes [B].
HINT:
In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
- Run the engine at an engine speed of between 1500 rpm and 2500 rpm for at least 3 minutes [C].
HINT:
During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform step [C] after charging control has completed.
- While running the engine at 2500 rpm and 1500 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [D].
HINT:
- If either of the voltage outputs of either the air fuel ratio or heated oxygen sensor does not fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.
- If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
- If the three-way catalytic converter has deteriorated, the heated oxygen sensor (located behind the three-way catalytic converter) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).