125000786 - 5040DD POLLUTION SENSOR SIGNAL CHECK (Odour sensor)
With the Examiner set to voltmeter function, select 20 volts full scale deflection and time base 5 seconds.Connect the black Examiner probe to the vehicle earth and the red probe to pin 3 of the sensor output signal.Turn the ignition ON.Wait for 36 seconds for the sensor to warm upSpray the gas in the aerosol ( Part no. 71715571) within 60 secondsPress the START button.The signal displayed must be a PWM pulse train with a frequency of 5 Hz and a Duty Cycle between 20 and 60 % as shown in the attached table.
PWM% Duty Cycle = T1/T2 where:
- T1 = pulse duration
- T2 = 1/f = 1/5 Hz = Transmission duration
Pin out:
- 1. +CH/15
- 2. Earth
- 3. Output signal
- 4 Not connected.