O2 Sensor diagnosis - Kia Forum
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#1 (permalink) Old 08-20-2012, 12:51 PM
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Default O2 Sensor diagnosis

We had a head issue an replace the head on an '02 sportage, as well as the exhaust manifold (very cracked). After the rebuild we got a O2 sensor failure (bank 1, exhaust), which we blindly replaced. The ECU reader showed no voltage on the sensor so we discovered the O2 sensor fuse, which was blown. Doh! We replaced that and still no voltages on the O2 sensor from the ECU. Not sure where to go from here. Does anyone know what we should be reading on the O2 sensor socket (schematic, voltages, etc.). Thanks!
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#2 (permalink) Old 08-20-2012, 02:05 PM
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Check out kgis on internet explorer only its free . All about kia's
hope this helps.
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#3 (permalink) Old 08-20-2012, 05:34 PM
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Originally Posted by nerdsite View Post
We had a head issue an replace the head on an '02 sportage, as well as the exhaust manifold (very cracked). After the rebuild we got a O2 sensor failure (bank 1, exhaust), which we blindly replaced. The ECU reader showed no voltage on the sensor so we discovered the O2 sensor fuse, which was blown. Doh! We replaced that and still no voltages on the O2 sensor from the ECU. Not sure where to go from here. Does anyone know what we should be reading on the O2 sensor socket (schematic, voltages, etc.). Thanks!
The O2 sensor should be showing from .1 volt to .9 volt, switching several times per second.

+1 on chief's recommendation to signup at the kiatechinfo website, where you can view the service info for the Sporty, particularly the ETM schematics for the O2 -> ECM circuit,

if you could post the (DTC) codes returned from the ECM, that would also help us give better info,

Regards,
GottaCruise

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#4 (permalink) Old 08-20-2012, 11:18 PM
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Out of curiousity, did you happen to re-check the new fuse to see if it blew? Usually when a fuse blows, you've got a short or something wrong in the wiring.
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#5 (permalink) Old 08-21-2012, 09:12 AM
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Thanks for the clarification on chief's recommendation--it makes sense now

The fuse is good (checked it a few times). Also, the voltage from the ECU reads 0 all of the time. The 2nd O2 sensor does have voltage values. My guess it's a wiring issue (otherwise why would it blow?), but I guess it could be a lot of things. I'll go check out the schematics. Thanks!
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#6 (permalink) Old 08-21-2012, 09:43 AM
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I found no schematics, but did find a diagnostic procedure to measure the heating element--I presume--of the o2 sensor (Pin 2 & Pin 4), and the signal wire (pin 4 to ground).

When you have the sensor inline, how have any of you tested these pins? My guess is it requires an inline testing cable (male & female cable), otherwise you'll never get any of your leads on the wire while you burn yourself doing it!
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#7 (permalink) Old 08-22-2012, 05:31 PM
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Originally Posted by nerdsite View Post
I found no schematics, but did find a diagnostic procedure to measure the heating element--I presume--of the o2 sensor (Pin 2 & Pin 4), and the signal wire (pin 4 to ground).

When you have the sensor inline, how have any of you tested these pins? My guess is it requires an inline testing cable (male & female cable), otherwise you'll never get any of your leads on the wire while you burn yourself doing it!
The o2 Heater circuit is powered off the (Fuel Pump) relay, which in-turn goes to the (Upper o2) Fuse, then to pin (1) of the Upper o2 connector (LG/R) wire,

I would check for positive battery (B+) voltage at the upper 02 fuse block, negative against frame ground,

If no joy, suspect the (Fuel Pump) relay as the culprit, if voltage at the Upper 02 fuse block, check Pin 1 at the upper o2 connector for positive battery (B+) voltage, negative against frame ground,

Posting the (DTC) code returned by the ECM may also help..

re: ETM schematics - try looking at the (2001) sportage ETM schematics,

MFI Control System -> Schematics :

Figure (1) shows the fuel pump relay,
Figure (2) shows the fuse / routing to the upper o2 sensor connector.

--
re: testing in-line, never done that, always tested with the o2 sensor disconnected, at the plug.. you could use a pin-probe at the back of the o2 sensor connector to tap in for live data, I guess..


In short, would be checking the fuel pump relay -> upper o2 fuse -> voltage to the primary o2 sensor heater circuit,

Hope this helps,
GottaCruise

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OBD-II Codes: http://www.obd-codes.com/trouble_codes/
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