Oxygen Sensor P0134 P0135 - Hyundai Forums : Hyundai Forum
 
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#1 Old 12-24-2009, 07:42 AM
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fverdi
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Hello to all. I have a Hyundai Accent 2001 1.5 16V DOHC 155.000 km (produced in Korea-Ulsan-I readied this from VIN) and recently a MIL lamp comes up (look at the appended picture "O2_mystery.JPG"). I took ELM diagnostic tool and I found P0134 (O2 sensor circuit no activity detected) and P0135 (O2 Sensor heater circuit) errors. Fine I said, I went to the shop and ordered Bosch OEM 0258986602 oxygen sensor. I mounted the sensor and two days enjoyed with nice driving. But then a MIL warning lamp occurred again. **** I said and read P0134/P0135 codes again. Then I done precise diagnose of the problem. I found the wiring-schematic of the Oxygen sensor and heater ("O2_mystery_1.JPG") and started to measure the electric signals on the O2 sensor connector with digital storage oscilloscope. First of all I measured the voltage on the signal line (pin 2-black line) of the O2 zirconium element and found badly responded voltage. By my knowledge the signal waveform is too slow, I'm I right??? Then I observed the signal for a period of 2 minutes and then bad responded signal jumped to 0.5V constant voltage (which is PCM simulated voltage I think) and after a minute an old bad responded voltage waveform occurred again. At this point I get suspicious about the heater and checked the 12V heater voltage supply on the pin 4 first, which was OK. Then I measured the voltage on the heater control pin 3 and found the voltage waveform as shown in violet colour in picture "O2_mystery.JPG" (0V with the 12 V spikes). Now the main question for the forum users is:

- which principle is used in my PCM to manage O2 sensor heater circuit? Is there a constant current driven through the 02 heater element (in this case
I assume that a PCM is driving the sensor heater pin to the ground and the 12V spikes which I measured are a consequence of a bad contact somewhere on
the installation).
Or the heater circuit is driven with the PWM (pulse width modulated) signal which is the case on the newer cars, so in this case the voltage waveform which I measured seems to be OK and the reason for the bad response of the zirconium element is in exhaust leakage?

Did anyone have a similar problem?

Manny thanks for the answers in advance,

Regards,

Fred
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File Type: jpg O2_mystery_1.JPG (135.9 KB, 40 views)
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#2 Old 12-24-2009, 08:31 AM
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Here's what odb-codes.com says about your codes:

A code P0134 may mean that one or more of the following has happened:

* Bad O2 (oxygen) sensor
* Bad heater circuit in the O2 sensor
* Wiring or connector to the sensor frayed / broken
* Blown heater circuit fuse
* Holes in the exhaust system
* PCM failure


A code P0135 may mean that one or more of the following has happened:

* O2 Heater element resistance is high
* Internal short or open in the heater element
* O2 heater circuit wiring high resistance
* open or short to ground in the wiring harness

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#3 Old 12-24-2009, 09:07 AM
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fverdi
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Ok thanks for the reply, but let me comment this to further clear the problem:

QUOTE (jsinton @ Dec 24 2009, 02:31 PM)
Quote:
Here's what odb-codes.com says about your codes:

A code P0134 may mean that one or more of the following has happened:

* Bad O2 (oxygen) sensor
[b]It's probably not bad - it's new one bought from Bosch car service
* Bad heater circuit in the O2 sensor
[b]I measured the resistance of the O2 heater (white lines pin 3,4) and read 9Ohms at hot engine 82 degrees, seems to be OK
* Wiring or connector to the sensor frayed / broken
[b]The response of the O2 element is bad at harness connector already, besides there is 12V heater supply on the harness connector and seems that PCM controls the O2 heater with PWM signal, so the wiring should not be the issue
the wiring
* Blown heater circuit fuse
[b]Heater circuit fuse its OK, there is 10 A fuse, I checked
* Holes in the exhaust system
b]I think this could be only reasonable issue
* PCM failure
[b]Have not checked yet, but if the heater is PWM driven the PCM should be OK

[A code P0135 may mean that one or more of the following has happened:

* O2 Heater element resistance is high
[b]I measured the resistance of the O2 heater (white lines pin 3,4) and read 9Ohms at hot engine 82 degrees, seems to be OK
* Internal short or open in the heater element
[b]It's OK
* O2 heater circuit wiring high resistance
[b]If the heater is PWM driven, this is OK, if not this could be the issue
* open or short to ground in the wiring harness
[b]All GND connections are OK
regards, Fred
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#4 Old 12-24-2009, 04:20 PM
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Yeah, I don't know what to tell you. It could be an intermittent problem like the wiring harness.

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