02 sensor
Thread Starter
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
02 sensor
I have sensor 1 from bank 1 and i want to test heater circuit
I have the following
Brown
Brown
Purple
Tan
What colors do I attach power and ground to see if sensor heats up
Thanks
I have the following
Brown
Brown
Purple
Tan
What colors do I attach power and ground to see if sensor heats up
Thanks
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
What are you reading when you test the heater voltage?? You SHOULD have FULL BATTERY VOLTAGE. If not, you have work to do.
Heres the schematic that you need. Test the voltage AT THE FUSE test points. There are TWO test points on top of each fuse. Measure them to chassis ground:
The 12 VDC power comes from the ignition switch which is well known to have issues:
The GROUND WIRE can also have issues and cause the heaters not to function properly. Measure the O2 Sensor connector to ground and make sure that you have proper continuity. That SPLICE PACK is behind the battery and has been KNOWN to get corroded and cause issues
Heres the schematic that you need. Test the voltage AT THE FUSE test points. There are TWO test points on top of each fuse. Measure them to chassis ground:
The 12 VDC power comes from the ignition switch which is well known to have issues:
The GROUND WIRE can also have issues and cause the heaters not to function properly. Measure the O2 Sensor connector to ground and make sure that you have proper continuity. That SPLICE PACK is behind the battery and has been KNOWN to get corroded and cause issues
Last edited by Bill Curlee; Mar 18, 2016 at 11:04 AM.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
With O2 sensors the 2 wires that are the same color are the heater. Then, with the remaining 2 wires the lighter color is the negative. So between purple and tan the tan is lighter color so it's the negative of the sensor. This is referring to the color of the wires coming out of the sensor, not the car wiring harness.
