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BAD OXYGEN SENSOR PO137 CODE>>LOW VOLTAGE BANK ONE< SENSOR 2

Tiny
TY ANDERSON
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Ok, Good your getting power to that side of the o2 sensor circuit. Now let focus on the other end.
Sorry for not making sure I sent the diag steps. It's complicated so I'll translate the steps to take.
1 turn key completely off, disconnect rear o2 sensor 4pin electrical connector and computer 88 pin connector. Switch your meter to continuity (looks light sound waves picture) Place positive probe on pin 39 (pic I gave you on the computer electrical connector) and neg. Probe on a ground ( power outlet wall or run a wire to the battery neg terminals). There shouldn't be any continuity if there is there is a short to ground on the blue wire running from computer to rear o2 sensor.
Start here and let me know how it goes, TY
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Thursday, September 5th, 2013 AT 9:03 PM
Tiny
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Ty. You are saying to disconnect the rear O2 sesor 4 prong connector, and also disconnest PIN 88 on ECU. There is nothing to disconnnected at pin 88 according to my wiring diagram?
I know how to do the continuity test. My meter has an adio so I can hear it if htere is continuity.
I just need help on the ECU pin 88
The car has to be jacked up to reach the rear O2 sensor. Its in a horrible spot way, way up against automatic-trani.
Thank for all your help so far!
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Friday, September 6th, 2013 AT 3:26 PM
Tiny
TY ANDERSON
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Sorry for the poor wording I meant the computer electrical connector (it has 88 holes for electrical pins on the connector it self).
You'll need to disconnected the o2 sensor or the continuity test will run through the sensor and give a wrong reading. All you're checking for on this test is a short to ground. So when you measure from the computer pin (#39 pin blue wire) to ground your meter shouldn't show any continuity. Talk to you soon, TY
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Saturday, September 7th, 2013 AT 8:35 AM
Tiny
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Ty. Sorry to bother you. Have a couple questions. When car is running (1998 KIA SPORTAGE), I told oyu I get 12 volts to both 02 sensor FUSES. Does that mean that the oxygen sensors are getting voltage up to where the connection joins (from end of sensor to 4 wire connector where it plugs into harness?
Also, if I check voltage on the engine side connector (blue/) where does that voltage come from? The ECU? Do I have to have the car runnning?
I will do the continuity test when this weather cools down here. Thanks so much.
Also, how come no voltage to both o2 sensor fuses when the car wasn't running? Just wondering.
THANK you so very, very much for ALL your help and all your replies. It means alot to me.
I hope we can solve this eventually! Gail
I will let you know!
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Monday, September 9th, 2013 AT 12:39 PM
Tiny
TY ANDERSON
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Power is supplied to the o2 sensors only when the engine is running so that is why you have power when measured with a meter at the fuses (because the engine is running it would be more like 14 volts due to the charging system).

You measure only at the fuses so all you know is there is power to the fuses.

You'll need to measure at the rear o2 sensor electrical connector to know if power is being supplied to the sensor.

Continuity test is done with the engine off ignition key off and removed from lock cylinder.
Follow the diag I sent prior to this and get back to me.
I hope this answered your question, TY
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Monday, September 9th, 2013 AT 8:51 PM
Tiny
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Hello TY. Okay, now I have 2 other CODES showing.A PO141 (HEATER CIRUIT) AND A po103 mASS FLOW AIR FLOW A CICIUT high
i DON'T KNOW IF THIS COMPLICATE THE SITUATION OF ONLY HAVING A po137 (LOW VOLTAGE DOWNSTREAM SENSOR 2).

I STILL HAVEN'T BEEN ABLE TO DO A CONTINUITY TEST AS I NEED A LIFT TO REACH THE CONNECTOR TO REMOVE IT FROM THE DOWNSTREAM SENSOR.

WHERE DOES THE 12 VOLTS COME TO THE )2 SESOR. FROM THE ecu COMPUTER?

ANY INFO APPRECIATED.I AGREE WITH YOU THERE MUST BE AN OPEN. THE OPEN SHOULD SHOW no CONTINUUITY, CORRECT IF ITS OPEN?
THANKS
gAIL
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Friday, October 4th, 2013 AT 8:14 PM
Tiny
TY ANDERSON
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This vehicle only had one code to begin with p0137 right or did the other codes exist also? Because, removing fuses and disconnecting electrical codes can and will trip more fault codes to show up. So if it is just the initial code you gave me let's stick with that code only.
A four wire O2 sensor is supplied power from the battery for the heater circuit only on the Green wire with a blue stripe. The other three wires all go back to the computer.
The Black wire with a red stripe is the ground side of the heater circuit for the rear most oxygen sensor. The computer controls when the O2 heater turns on and off on the ground circuit.
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Sunday, October 27th, 2013 AT 2:00 AM
Tiny
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Hi TY. Originally the 98 kia sportage only had a P0137 code. Now it has the 2 others (po141, and Po103). I am sorry I didn't get back to you but have been sick, so wasn't able to diagnose this car problem.
I think I undertsand what you are saying. You are checking for continuity from rear (DOWNSTREAM) O2 sensor connector to pin 39 on ECU. I see in a wiring diagram that the oxygen sensor has grounds at the ECU on pin # 10 and pin #30, both grounds.

Do I need to check all 4 wires for continuity or just that one blue wire at pin #39 at ECU.
**there should be continuity if the wires are good, correct? And no contnuity if there is an open, correct?
I am a bit novice at electrical, so bear w/ me.
Also, does the BATTERY NEGATIVE post have to be disconnected to remove ECU 88 pin connector?
Thanks.I think I am getting what you are saying!
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Monday, October 28th, 2013 AT 8:40 PM

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