BOSCH 028851132466 / NTK L1H1

Pin outs, sensor calibrations etc
bdog
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Joined: Thu Nov 05, 2009 6:55 pm

BOSCH 028851132466 / NTK L1H1

Post by bdog »

Hi,

I just received BOSCH 028851132466 (36531-P07-003) wideband O2 sensor that I plan to use with my newly received S6PNP. Its BOSCH model number is 13246 and is supposed to be a re-branded NTK L1H1. However, instead of orange wire (pin8) it has a gray one. Does anybody have experience with these sensors and are they really L1H1?

Thanks,
Assen
Charlie
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Re: BOSCH 028851132466 / NTK L1H1

Post by Charlie »

If you have the sensor i think you have Assen, its a L1H1 / L2H2 sort of hybrid. I run one in my car.

If you read the thread below this one, Wez has the same sensor and it should give you an indication of wiring etc.

Cheers,

Charlie
bdog
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Re: BOSCH 028851132466 / NTK L1H1

Post by bdog »

Well, the sensor Wez describes has slightly different wire colors.

Mine are:

Pin1 - Black
Pin2 - White
Pin3 - Red (or dark Pink)
Pin4 - Empty
Pin5 - Resistor
Pin6 - Resistor
Pin7 - Yellow
Pin8 - Grey


Image

I'll give it a try probably using Zeitronix ZT2 unit as a reference.
bdog
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Re: BOSCH 028851132466 / NTK L1H1

Post by bdog »

Yesterday, I tried the wideband probe without success. Probably I'm missing something or making some mistakes so I'll try to describe my steps:

Wiring:

L1H1 connector:
Image

S6PNP UEGO connector:
Image

Code: Select all

L1H1 connector:                 goes to                    S6PNP UEGO connector:

Pin1 - Black                      ->                        Pin3 - LAM GND (Cell Ground)
Pin2 - White                      ->                        Pin2 - LAM I (Ion Pump Current)
Pin3 - Red (or dark Pink)         ->                        Pin1 - LAM V (Nernst Cell Voltage)
Pin4 - Empty                    Not Used
Pin5 - Resistor                 Not Used
Pin6 - Resistor                 Not Used
Pin7 - Yellow                     ->                        Pin4 - VBAT (Heater +
Pin8 - Grey                       ->                        Pin5 - INJ* (Heater -)
Configuration in SCal;
1. IO Configuration -> Pin Assignments -> Inputs: Lambda Sensor 2 = LAMBDA V : CTL-33

2. Sensors -> Lambda Sensor 2 -> Input Conguration = UEGO Lambda
Sensors -> Lambda Sensor 2 -> Sensor Type = WIDE BAND UEGO

However, I got nothing in lam2 but constant 14.7AFR. Am I missing something in wiring and configuring or the sensor is no good?

Additionally, I have one more question:
Can two functions share one output pin? e.g. Can Change Light and Knock Control Warning share CTL64 (Pin A8 - Warning Light on MY98 STi)?
pat
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Re: BOSCH 028851132466 / NTK L1H1

Post by pat »

Assen,

Just check that you have a UEGO linearisation in the lam2 sensor setup, ie Sensors -> Lambda 2 -> Linearisation. If not, the simplest option is to open a second copy of SCal and create a calibration from profile, this will automagically put a EUGO linearisation into at least the lam1 sensor linearisation, simply copy and paste that into your lam2 linearisation. When in the linearisation you should be also to see the output voltage from the UEGO transimpedance amplifier, that should be around 2.5V at stoich, just check that you are actually getting something there too, and check whether the voltage changes as the AFR changes.... it is also possible that you were getting some kind of an output but it was "unacceptable" and therefore the ECU marked the sensor as failed and gave a default reading (which may be 14.7).

As for output sharing, the only permitted sharing is with ignition outputs, ie multiple cylinders can share a single output (hence allowing wasted spark and distributor operation) however sharing of the Change Light and the Knock Warning is not presently possible, moreover it would not make sense. Knock Warning is a state output, ie if cylXKnockIgnRtd exceeds a given value the output turns on until all cylXKnockIgnRtd fall back below the threshold, if you were to rev past the Change Light threshold during this time it would try to illuminate an already illuminated light, ergo no effect.

Hope this helps,

Pat.
bdog
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Joined: Thu Nov 05, 2009 6:55 pm

Re: BOSCH 028851132466 / NTK L1H1

Post by bdog »

Hi Pat,

I didn't mention Sensors -> Lambda 2 -> Linearisation because I used the default values (i.e. 1.564-.21.80, ... , 2.502->14.69, ... , 4.927 -> 8.94). I'll give that probe one more chance, probably try to scope the signal and if not successful go for a ZT2 unit.

Thanks,
Assen
Charlie
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Re: BOSCH 028851132466 / NTK L1H1

Post by Charlie »

Where did you get the sensor Assen? And have you a link to it?
bdog
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Re: BOSCH 028851132466 / NTK L1H1

Post by bdog »

I friend of mine had a spare brand new probe left from his Techedge DIY kit(afaik it is bought from Amazon http://www.amazon.com/gp/product/B000BZ ... B000BZG66Q). I tested it again and it apparently doesn't work - shows steady 2.5V on the Linearization screen.

I have nice experience with Zeitronix units(unfortunately I sold mine along with my previous fun car - AE86), so I'm going that way again - the controller kit including LSU probe is nearly the same price as L1H1.
Slowie
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Re: BOSCH 028851132466 / NTK L1H1

Post by Slowie »

I am having the same issue as the original poster. with lambda showing 2.5V at all times (lambda 1).

I have an NTK LZA-09E1 supplied by Andy Forrest, connected as follows:

Yellow Heater +12V +12v supply
Blue Heater Drive from ECU Pin 14
Black Signal Ground to LAMGND Pin 34
Grey Nernst Cell Voltage to LAMV Pin 33
White Ion Pump Current to LAMI Pin 57

Input configuration is set to UEGO Lambda, and Sensor Type to Wideband. The LZA linearization is selected.

To get my car mapped I resorted to an external wideband controller, and 0-5v input, but I want to get the built in one working now.

Ryan suggested trying a different sensor as mine appeared faulty, yet the replacement sensor does exactly the same (lambda V always 2.5V in SCal).

Some testing revealed that cell voltage (pin 33 and 34) rises steadily to 2.1V after key on, and does not drop to 450mV as it should. At no point do I read any current on pin 57. lamHtrV shows 20V for 20s (timeout specified in SCal), then drops to 0, even though heater voltage it set to 10.7.

Has anyone else ever seen this issue before? I have checked and double checked the wiring and software setup, to no avail. I would hate to have to lose an input over this.

Thanks

Paul
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Re: BOSCH 028851132466 / NTK L1H1

Post by stevieturbo »

Has your sensor ever given a sensible reading ?

Or has it always been like that ?

Is your input configured correctly in I/O ?
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