EMU Classic LSU 4.2 wideband not valid

EMU BLACK / CLASSIC
1

Hi everyone,

I am currently troubleshooting the built-in wideband Lambda input on my EMU Classic. I have attached a screenshot of the log showing the issue.

There is no specific Lambda fault code. The Check engine code value remains at 0 throughout the entire log.

However, the Lambda system never provides a valid reading. These are the relevant values from the log:

  • Lambda is valid: 0 throughout the entire log
  • Lambda 1: fixed at 1.000
  • AFR: fixed at 14.7
  • WBO is calibrating: 0
  • WBO sensor temperature: 0 for practically the entire log
  • WBO Heater DC: reaches up to 85% and runs at approximately 66% while the engine is running
  • WBO VS: approximately 4.82 V
  • WBO IP ADC: approximately 4.8 to 4.9 V
  • WBO RI: approximately 2.49
  • Lambda guard status: normally 7

image
image1702×486 29 KB

The ECU appears to be controlling the sensor heater, but it never considers the Lambda signal valid. Therefore, the fixed Lambda value of 1.000 and AFR value of 14.7 do not appear to be actual measurements.

Sensor is a BOSCH 0 258 007 351 btw

Thanks

2

A few people have had issues with direct connection of LSU4.2 sensors to their Classics and never resolved them (me included). We’ve resorted to using external WBO controllers.

@Jadzwin_ECUMASTER - do you have any suggestions?

Example of one of my logs for comparison.

LSU4.2 log
LSU4.2 log1267×897 238 KB

3

If you’re not getting a temperature, you probably have a bad connection. I had the same, I repinned the plug and no issues since

4

Not connection issues for me. You can see the voltages being recorded.

I recently shifted onto the v3 software which has different setup for the LSU4.2. I’ve tried connecting an LSU4.2, on both the old v1 classic software and v3Studio. No joy on either of my Ecumaster Classics, using two different genuine Bosch LSU4.2 sensors. Back to using external controllers.

5

Yes, same with my issue, I had all the right voltages, but heater dc sat at 65% which seems to be a fail safe value, and intermittent temperature, because of poor connection on the heater pins

6

Yes, thanks Matth - I understand your issue and the fix that worked for you, but my Heater DC is cycling fine, not flat lining. I’ve rewired it several times, even tried one of the ecumaster cables, no joy. Anyway, I’m back on the external controller, which is fine - just a bit more signal delay to deal with.