Syvecs Forums

Heater dropping to 0 after the (configured) 20s is normal behaviour unless the engine is running.

Is the sensor input configuration set to be UEGO rather than (say) 5V?

Thanks, I expected to see 10.7 heater voltage, but if 20 is normal that's good.

Yes, the sensor is assigned as UEGO, and in IO config I have Lambda 1 set to Lambda V.

This problem has been there since the ECU was fitted, I have never seen a correct reading with the sensor directly wired, hence using the external controller in the past.

The heater will be at full power for the configured time, and then drops to the voltage in the rpm vs tps table. The heater is driven by PWM so you won't measure a DC voltage that is meaningful, or representative, anyway.

If you have tried 2 different sensors, then the fault is only likely to be:

- the sensor cable that runs from the sensor to the S6
- the Cal (what about the default high and low voltage settings?)
- a faulty ECU

If it has never worked correctly, and you are 100% sure the wiring is good and you've tried different sensors, then really you'd be best sending the ecu back for testing.

Sensor cable was replaced when I replaced the sensor.
Default voltage high set to 5, default low set to 0, so they are not being tripped.
Aaargh.


I will continue using the external controller for now, and ship it back half way round the world when convenient, or if my local agent has one in stock I can borrow.

Thank you all

On the voltage input pin....if you disconnect this wire, does LamV change ?

If you apply 5v to this wire, does LamV change ?

Hmm...I haven't tried giving it 5V, I will try that when next I go out to the car (stored away from my house). If I unplug the sensor the voltage stays at 2.5V though...

I didnt say unplug the sensor, just the voltage input wire.

Yup, you just reminded me of the behaviour I previously saw with sensor unplugged.

As said, will report back when I get to see the car again on Sunday, and can run the suggested test.

Don't forget to properly calibrate the sensor after you get it working, the linearisation from the DB will not be accurate! See topic below this one, L2H2.