uge directly to the Trouble with my O2 sensor signal in turbo application
07-01-2006, 07:04 PM
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Trouble with my O2 sensor signal in turbo application
The rundown:
B18C1 ob2, to obd1 conversion on a P72 ecu with phearable.net chip..
I installed an AFR gauge, and used the white wire at plug D7.. I get nothing..
So I thought maybe the gauge could be bad, so I put another gauge in.. same thing - nothing..
Bought a new OE O2 sensor, same thing..
disconnect the O2 sensor from the harness, connect the signal wire (purple) from the gauge directly to the black signal ware on the O2 sensor (Bosch, 2 whites-heaters, grey-ground, black-signal.. )
Nothing at all.. even driving the car, there is no fluctuatiuon of the gauge..
Ideas?
Modified by Qwik_XR at 11:36 PM 7/1/2006
B18C1 ob2, to obd1 conversion on a P72 ecu with phearable.net chip..
I installed an AFR gauge, and used the white wire at plug D7.. I get nothing..
So I thought maybe the gauge could be bad, so I put another gauge in.. same thing - nothing..
Bought a new OE O2 sensor, same thing..
disconnect the O2 sensor from the harness, connect the signal wire (purple) from the gauge directly to the black signal ware on the O2 sensor (Bosch, 2 whites-heaters, grey-ground, black-signal.. )
Nothing at all.. even driving the car, there is no fluctuatiuon of the gauge..
Ideas?
Modified by Qwik_XR at 11:36 PM 7/1/2006
07-01-2006, 07:24 PM
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Re: uge directly to the Trouble with my O2 sensor signal in turbo application (Qwik_XR)
07-01-2006, 07:29 PM
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Doh!
WTF is D7 then?
Edit:
I see D7 is WHT PrimaryO2 Sensor signal -
D14 is WHT/RED - Secondary O2 Sensor signal -
Why use one over the other? I only have one O2 sensor, but both O2 plugs are in the engine harness... Does the OBD1 P72 look at the secondary only?
For grins, I unplugged the O2 sensor from the one harness connection, and plugged it into the empty harness connector, and still got no reading..
This is with two different (new) O2 sensors, and two (different) Autometer AFR gauges..
Modified by Qwik_XR at 11:41 PM 7/1/2006
Modified by Qwik_XR at 11:44 PM 7/1/2006
WTF is D7 then?
Edit:
I see D7 is WHT PrimaryO2 Sensor signal -
D14 is WHT/RED - Secondary O2 Sensor signal -
Why use one over the other? I only have one O2 sensor, but both O2 plugs are in the engine harness... Does the OBD1 P72 look at the secondary only?
For grins, I unplugged the O2 sensor from the one harness connection, and plugged it into the empty harness connector, and still got no reading..
This is with two different (new) O2 sensors, and two (different) Autometer AFR gauges..
Modified by Qwik_XR at 11:41 PM 7/1/2006
Modified by Qwik_XR at 11:44 PM 7/1/2006
07-02-2006, 09:24 PM
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Re: (Qwik_XR)
yo give me a call today. i was doig some research and came up with this i still think i might be right about that o2 wiring, but check it out and lmk...
green - O2 ground - ECU-D22
white - O2 signal - ECU-D14
black - heater - ECU-A6
black - heater - ignition (connector full of yel/blk wires at driver's shock tower, they are all tied together, splice into one)
It doesn't matter which black wire you choose, the heater doesn't care which direction the power flows through it.
if i remember right, d22 and a6 are switched grounds though the ecu
when it all comes down to it, it's a one wire gauge. it will not beat me...
green - O2 ground - ECU-D22
white - O2 signal - ECU-D14
black - heater - ECU-A6
black - heater - ignition (connector full of yel/blk wires at driver's shock tower, they are all tied together, splice into one)
It doesn't matter which black wire you choose, the heater doesn't care which direction the power flows through it.
if i remember right, d22 and a6 are switched grounds though the ecu
when it all comes down to it, it's a one wire gauge. it will not beat me...
07-02-2006, 09:30 PM
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Re: (2gturboteg)
ok i need to get to bed but the pin numbers i gave were WRONG i will pull out my pinout at work tomorrow and look at it again. i think i looked at an obd2 pinout or something but i just realized obd1 has no d plug at the ecu. ok... i need sleep. later.
07-03-2006, 06:06 AM
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Yeah, that D14, is present at the OBD2 harness (WHT/RED), but does not pass through the conversion harness (nice try though, "A" for effort 
)..
It all boils down to that the signal should STILL produce output, regardless of whether the heater function is operational or not.
Even with it disconnected from the engine harness, and the O2 is isolated to itself, it still does not produce a signal that an AFR meter will read. Remember, something is goofy with the whole thing, as I've tried a total of three sensors and two gauges and nothing.. It's sooo wacky..
I still haven't driven it since you did yesterday.. I'm going to try to take it for a spin today, once I'm freed from kid-duty
)..It all boils down to that the signal should STILL produce output, regardless of whether the heater function is operational or not.
Even with it disconnected from the engine harness, and the O2 is isolated to itself, it still does not produce a signal that an AFR meter will read. Remember, something is goofy with the whole thing, as I've tried a total of three sensors and two gauges and nothing.. It's sooo wacky..
I still haven't driven it since you did yesterday.. I'm going to try to take it for a spin today, once I'm freed from kid-duty
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