I have very methodically wired an EMU Classic (to my SC300 2JZ GE upfitted with a turbo and CAM & Crank Trigger Kit) harness according to this pinout: EMU Pinout
I have tested each and every output and all are good as shown in this short video: Output Test
For some reason, I am having trouble with my O2 sensor. It is a Bosch LSU 4.2. I have checked over the wiring at least 10 or more times to make absolutely sure it is right.
When I try to start the car, it runs momentarily and then dies and will not start again.
At that point I get an CEL.
I originally had the SC300 harness pins B04, B79, and B80 connected to EMU pins B24, G17 and G24. I have since changed this to pins SC300 harness pins B78, B79, and B80 connecting to EMU pins B24, G17 and G24. I have not tried to start it with the new grounding configuration. Not sure if having the B04 pin connected to the ground pins on the EMU would cause a problem?
I think they have some issues with the O2 on classic and black ecus, i also hooked up an 4.2 as specified, entered the rCal, but no reading what so ever.. google showed that more people had the same issue, so I hooked up an Innovate LC1 with analog output to analog #4 pin. It worked immediately(same sensor), so i just went with it.
I’ve never been able to get an LSU 4.2 to work on either of my Classic ecus… tried with two new sensors with no luck, so eventually went to external controllers.
Did you look at the voltages on the WBO Heater DC, WBO IP ADC, WBO IP Meas., WBO RI and WBO VS log channels to see if you’re ECU is registering any voltages?
Thanks so much for getting back. Your feedback is appreciated. At least I am not crazy. I know things are wired correctly. I can check the voltage in the charts, but it sounds like an external controller should address the problem. Here is a sample of the chart from the graph file.
I have an LSU 4.2 running on my Classic no problem. You definitely have the pins wired correctly? Not looking at the LSU pinout backwards? And where have you run the +12v for the sensor from?
Ya. I’m am positive they are correct. I have checked them no less than 10 times. If I had them backwards all my other wires would be backwards as well. All other outputs and wires are good. The +12V is coming from a fused line from the battery. I am also bench testing with a power supply set to 12V.
BTW This is an old version of the EMU Classic if that matters
Bruce, that log looks similar to what I was recording - the sensor is sending and the ECU is receiving voltages, but there’s no lambda or AFR reported.
You and Matth made me wonder about the sensors we’re using. I asked Google if all LSU4.2 sensors share the same pinout and got this response:
No, all Bosch LSU 4.2 oxygen sensors do not share the same pin number assignment. While they use the same 5 core wire colors, the actual pin numbers on the connector depend on the specific Bosch part number.
Key Differences to Consider
Part Number Variations: Different part numbers (e.g., Bosch (0258007057) vs. (0258006066)) have completely different pin numberings for the connector, even though the internal wire colors remain identical.
Wire Color Consistency: Always wire the sensor based on the wire color, rather than the pin numbers, unless you are absolutely certain of the mating connector’s schematic.
The Calibration Resistor: The 6th pin (often green) is a laser-trimmed calibration resistor ((R_{cal})) located inside the sensor’s connector. Its specific resistance value is unique to that individual sensor and helps your controller read it accurately.
Maybe worth looking into…
I’m building another engine over the next few weeks and will definitely be taking another look at this as I’d like to ditch the external controllers (which are likely to be adding extra lag to the O2 readings).
Too funny. I made the same query of Google and got the same answer. I have double checked that the right wires from the ECU is going to the right pin numbers as labeled on the O2 sensor connecter. There are little number inside the electrical connector. I am very confident I have them right.
Unless the colors and pin numbers are different for the LSU 4.2 I purchased (Bosch 0258007351 / 17014) for a Audi A4 A8 TT VW Jetta Golf Beetle EuroVan.
I ordered a Innovate LC-2 that I will receive this coming Tuesday. I will see if that works.
So after doing some more searching on the Bosch 17014 O2 sensor, there are a couple of posts that suggest the wring for this sensor might be different than the conventional LSU 4.2.
Update:
I just checked the resistance across pins 3&4 (3.6 Ω) and 6&2 (88Ω) on my 17014 and these are the typical readings for a LSU 4.2 using the normal pins so I think the two post above do not apply to my sensor.
That is the same sensor that I’m using, but it’s now all heatshrink/cable sleeved into the car so I can’t easily check how I wired it. I’d assume I did it per the diagram that came with my Classic. Can you do a diagram showing how you’ve wired it?
