secondary o2 sensor test
06-22-2016, 01:55 AM
#1
Registered User
Thread Starter
Join Date: Jan 2007
Location: Sweden
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
secondary o2 sensor test
Is it possible to test the secondary o2 sensor with a torch and a multimeter? (sensor on the cat)
I thougt it would be possible to measure volts on black and grey on the sensor och blow with a torch on the sensor..
Can someone help me out here?
/Broman
I thougt it would be possible to measure volts on black and grey on the sensor och blow with a torch on the sensor..
Can someone help me out here?
/Broman
06-22-2016, 06:24 AM
#2
Are you trying to test the O2 sensor? If so, you need to test whether the sensor is getting voltage (ignition on --- engine off). Measure ECM side of connections. Should be ~12 VDC.
If the sensor is getting voltage, then measure the resistance across pin 3 and 4 of the O2 sensor connection. Should be 3.3 ohms for O2 sensor 1 (front). And 12-14 ohms for sensor 2 (rear). This are values for AP2 engines.
And whether pin 3 or 4 has a short to ground. This is measuring the O2 sensor side of connection. It's on page 11-71, of 2000-2008 Honda Service Manual. I tried to take photo of page. Hope you can read it.
If the sensor is getting voltage, then measure the resistance across pin 3 and 4 of the O2 sensor connection. Should be 3.3 ohms for O2 sensor 1 (front). And 12-14 ohms for sensor 2 (rear). This are values for AP2 engines.
And whether pin 3 or 4 has a short to ground. This is measuring the O2 sensor side of connection. It's on page 11-71, of 2000-2008 Honda Service Manual. I tried to take photo of page. Hope you can read it.
06-22-2016, 09:15 AM
#3
Registered User
Thread Starter
Join Date: Jan 2007
Location: Sweden
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
The heater circuit is fine (pin 3,4) 12v and the resistance between 3 and 4.
But i would like to test the sensor it self on pin 1 and 2.
If i understand it right, it would be 0,3-0,6 volt dc between pin 1 and 2 if i would warm the sensor with a torch.
I dont get any volts by doing that, and i tryed it with two sensors.
This is measured on the sensor connector.
But i would like to test the sensor it self on pin 1 and 2.
If i understand it right, it would be 0,3-0,6 volt dc between pin 1 and 2 if i would warm the sensor with a torch.
I dont get any volts by doing that, and i tryed it with two sensors.
This is measured on the sensor connector.
06-22-2016, 12:53 PM
#4
An oxygen sensor measures oxygen so not sure if heat would make any difference.
Spray some brake cleaner or similar in a rag and put the sensor in there, then take it out and blow on it and see if you get any voltage change.
I think you could use the gas from the torch as well (no flame).
Spray some brake cleaner or similar in a rag and put the sensor in there, then take it out and blow on it and see if you get any voltage change.
I think you could use the gas from the torch as well (no flame).
06-23-2016, 02:11 AM
#5
Registered User
Thread Starter
Join Date: Jan 2007
Location: Sweden
Posts: 53
Likes: 0
Received 0 Likes
on
0 Posts
An oxygen sensor measures oxygen so not sure if heat would make any difference.
Spray some brake cleaner or similar in a rag and put the sensor in there, then take it out and blow on it and see if you get any voltage change.
I think you could use the gas from the torch as well (no flame).
Spray some brake cleaner or similar in a rag and put the sensor in there, then take it out and blow on it and see if you get any voltage change.
I think you could use the gas from the torch as well (no flame).
I was wondering if i measures the right way, black and grey wires.
If i try this on the primary o2 sensor, i get volts.
https://www.youtube.com/watch?v=YL6xkOZxHZ0
06-23-2016, 05:16 AM
#6
So, you do have voltage to the sensors? And there are no shorts between pins 3 and 4 ---> to ground?
What voltages are you getting, by heating the sensor? There must be a threshold voltage that triggers a response from the ECM.
Thanks!
What voltages are you getting, by heating the sensor? There must be a threshold voltage that triggers a response from the ECM.
Thanks!
06-23-2016, 07:24 AM
#7
Heating the sensor with a blow torch doesn't seem like a very good idea, it's probably double the normal working temp.
Use the built in heater instead, connect 12V to the white wires (it should draw less than 1A) and wait maybe 1min for it to heat up fully.
Connect a volt meter to the black and grey wires, in free air it would probably read around zero.
Now spray some brake cleaner in a rag and put it around the sensor, voltage should climb up to around 1V.
I have a spare sensor lying in my garage that I just tested like this.
I saw that you were looking to buy a sensor but this is the only one I got, I'm running without it right now.
Otherwise you could have had it
Use the built in heater instead, connect 12V to the white wires (it should draw less than 1A) and wait maybe 1min for it to heat up fully.
Connect a volt meter to the black and grey wires, in free air it would probably read around zero.
Now spray some brake cleaner in a rag and put it around the sensor, voltage should climb up to around 1V.
I have a spare sensor lying in my garage that I just tested like this.
I saw that you were looking to buy a sensor but this is the only one I got, I'm running without it right now.
Otherwise you could have had it
Trending Topics
07-17-2016, 11:58 PM
#8
Registered User
Join Date: May 2014
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Are you trying to test the O2 sensor? If so, you need to test whether the sensor is getting voltage (ignition on --- engine off). Measure ECM side of connections. Should be ~12 VDC.
If the sensor is getting voltage, then measure the resistance across pin 3 and 4 of the O2 sensor connection. Should be 3.3 ohms for O2 sensor 1 (front). And 12-14 ohms for sensor 2 (rear). This are values for AP2 engines.
And whether pin 3 or 4 has a short to ground. This is measuring the O2 sensor side of connection. It's on page 11-71, of 2000-2008 Honda Service Manual. I tried to take photo of page. Hope you can read it.
If the sensor is getting voltage, then measure the resistance across pin 3 and 4 of the O2 sensor connection. Should be 3.3 ohms for O2 sensor 1 (front). And 12-14 ohms for sensor 2 (rear). This are values for AP2 engines.
And whether pin 3 or 4 has a short to ground. This is measuring the O2 sensor side of connection. It's on page 11-71, of 2000-2008 Honda Service Manual. I tried to take photo of page. Hope you can read it.
I have a my2007
Thank you so much!
Thread
Thread Starter
Forum
Replies
Last Post