O2 wire voltage for testing
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: O2 wire voltage for testing (ericcer)
If you did, it is too late. Toss it and buy a new one.
Not in any order:
1. O2 sensor wire
2. O2 sensor wire return
3. heater wire
4. heater wire return
The returns will eventually get tied to ground.
Measuring the heater, no big deal. Measure the O2 sensor, you kill it.
The heater wire is generally White in color. Black would be the O2 sensor. Gray would be the O2 sensor return. But, again this is typical.
If the heater, or O2 goes bad, the PCM will tell you MIL/SES lamp. That is what ODB2 does.
Not in any order:
1. O2 sensor wire
2. O2 sensor wire return
3. heater wire
4. heater wire return
The returns will eventually get tied to ground.
Measuring the heater, no big deal. Measure the O2 sensor, you kill it.
The heater wire is generally White in color. Black would be the O2 sensor. Gray would be the O2 sensor return. But, again this is typical.
If the heater, or O2 goes bad, the PCM will tell you MIL/SES lamp. That is what ODB2 does.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: O2 wire voltage for testing (ericcer)
To check the wiring use the following with a multi meter but do not check the O2 sensors them selves and make shure you disconect all conectors prior to conecting the meter
96 pin out is as follows ( The PCM conector is the C connector witch is the grey some times clear connector)
bank 1 (left front) (PCM pin 19 to O2 pin A TAN/WHT wire) (PCM pin20 to pin B on the O2 PPL/WHT wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
bank 1 (left rear) (PCM pin 17 to O2 pin A TAN/WHT wire) (PCM pin 18 to pin B on the O2 PPL/WHT wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN Wire)
bank 2 (right front) (PCM pin 7 to O2 pin A TAN wire) (PCM pin 8 to pin B on the O2 PPL wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
bank 2 (right rear) (PCM pin 3 to O2 pin A TAN wire) (PCM pin 4 to pin B on the O2 PPL wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
Hope this will help I think I got it right No typos.
[Modified by ejfagala, 12:31 AM 2/8/2003]
96 pin out is as follows ( The PCM conector is the C connector witch is the grey some times clear connector)
bank 1 (left front) (PCM pin 19 to O2 pin A TAN/WHT wire) (PCM pin20 to pin B on the O2 PPL/WHT wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
bank 1 (left rear) (PCM pin 17 to O2 pin A TAN/WHT wire) (PCM pin 18 to pin B on the O2 PPL/WHT wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN Wire)
bank 2 (right front) (PCM pin 7 to O2 pin A TAN wire) (PCM pin 8 to pin B on the O2 PPL wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
bank 2 (right rear) (PCM pin 3 to O2 pin A TAN wire) (PCM pin 4 to pin B on the O2 PPL wire) (O2 pin C to GND BLK wire) (O2 pin D to Fuse Pnl +12 VDC BRN wire)
Hope this will help I think I got it right No typos.
[Modified by ejfagala, 12:31 AM 2/8/2003]
Thread Starter
Drifting
Joined: Jul 2001
Posts: 1,296
Likes: 0
From: Largo Florida
Re: O2 wire voltage for testing (ejfagala)
I had checked the connector with the ignition on and got these voltages with both sides.
Tan wire - less than 2 volts
purple wire - less than 2 volts
black wire - 0 volts
brown wire - 12 volts
Next I will need to do a continuity test with the pin outs you listed above. Do those voltages look normal?
Tan wire - less than 2 volts
purple wire - less than 2 volts
black wire - 0 volts
brown wire - 12 volts
Next I will need to do a continuity test with the pin outs you listed above. Do those voltages look normal?
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: O2 wire voltage for testing (ericcer)
The +12VCD and the black wire being 0 VDC are normal but as far as the other 2 I cant say. With the O2 sensor conected and engine running it should be between 1-1000 mv (Varies) What are your symptoms?
Thread Starter
Drifting
Joined: Jul 2001
Posts: 1,296
Likes: 0
From: Largo Florida
Re: O2 wire voltage for testing (ejfagala)
Take a look at my other post for details entitled "Odd O2 readings".
http://forums.corvetteforum.com/zerothread?id=489186
http://forums.corvetteforum.com/zerothread?id=489186
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: O2 wire voltage for testing (ericcer)
Are you getting any Codes? check for quick changes in your O2 sensors in diferent trottle positions the sensors should react quickly if they do not you may have got some silicone on them mhen you replaced them or resealed them. Also check the Gnd wires they should read close to 0 Ohms touch the leads of your meter togeather first to establish a referance then check between the - Bat lead and the Gnd wire.
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