Hondata

Hondata,
I have a car with a customer's Honda Kswap NA built by me a few years ago and it works perfectly.
I had to do some work and when I connected the laptop the Kmanager program suggested me to update the calibration by uploading with the new version 4.5.7.
Before uploading the file, I activated communication and made a datalog in which everything worked perfectly.
I put the car on the dyno and at that point loaded the previous calibration with 4.5.7.
I immediately noticed that with the engine off the Map (Honda Stock Sensor) indicated 2 Kpa compared to the usual 98 Kpa similar to the PA.
I started the car and everything worked fine, but looking at the real values the MAP value continued to move from 2 Kpa to 170Kpa to 260 Kpa in a fast and strange way without logic.
I tried replacing the MAP sensor and the problem remained.
I checked the +5 V, the sensor ground and the signal and everything seems to work.
Despite the MAP value changing rapidly with these strange values, the engine works well, the ignition advance is stable and so is the AFR.
I tried to do a Dyno pull to record the values and although the MAP changes in a strange way with important jumps between 2kpa and 280Kpa, the ignition advance faithfully resumes the value indicated in the calibration table for 98-100 Kpa (NA engine ) .The AFR is correct without strange behavior as well as the injector duty cycle.
At this point I tried to measure the signal from the MAP sensor at idle with an oscilloscope and it is constant at around 1.18 V while in real values it continues to move with large values.
I measured the signal from the MAP sensor with the engine running (i.e. with atmospheric pressure) and it is 2.88 V.
The engine control unit is a PRB and the Kpro installed is a V1.
I also tried to do an Erase ecu and a complete upload calibration but the problem remained.
Could there be something wrong with the 4.5.7 Kmanager update?
I attached to the email the screenshot of the datalog in which you can see the MAP signal with strange movements, the datalog files of the test on the bench

What is the serial number that is on the K-Pro board inside the ECU?

The Kpro serial number is 05000303, it's a Oem Hondata Kpro Board

The ecu is 37820-PRB-A06
I try now with another Kpro Board, a V2 serial number 05006017, uploaded the calibration but the issue is the same.
With engine off and datalog on i have a MAP value of 232 Kpa but if i read the voltage out from the MAP is 2.88 v for a 98Kpa.
I start the engine, it run fine and at idle a ignition 10-12° stable value but the MAP have a weird signal and jump from 2 to 90 to 230 or 136 Kpa etc

Post the calibration that the datalogs were made with.

Attached at this message

The datalogs you have posted both appear to be corrupt, or the ECU has a bad calibration in it as they are giving incorrect data. Try going to the online menu and erasing the ecu, then opening the calibration you want to use and upload it to the ECU.

Spunkster, i have do this a few time but the issue still present.

If it has done this with 2 K-Pros and 2 ECU's then the problem is most likely a wiring related issue in the vehicle.

Spunkster, this is the test i have done :

- Measured the 5V at the Map connector with or without Map connected and it's ok
- Measured the sensor Grount at Map connector with or without Map Connected and it's ok
- Installed a different Ecu with a different Kpro, uploaded the file problem still present, uploaded a different file , change the laptop problem still present.
With the new ecu , erase ecu, upload a file from the Kmanager database but problem still present.
- Connected directly the Map Sensor with new wire directly from Ecu connector (new pin and wire) to the map (new pin and connector) and the problem still present.
- Try a different MAP from a know working car and the problem still present
- Engine running at stable idle 1100 rpm , i measure the vacuum at 30 kpa, oscilloscope (2000 Hz) in the map signal at the ecu connector, signal stable at 1.18V-1.20 V but the datalog show me a wird value from 72 kpa to 236 kpa etc

A little consideration, the MAP is the Oem MAP with a max read of 174 Kpa . For check this i disconnect the MAP and the value in the log is 174 Kpa (at around 4.88 Volt).
How can the ECU show me 236 Kpa if the max valure from the Map is 174 Kpa at 4.8 Volt???????? Phisically is impossible!
If with engine running i disconnect the MAP the engine immediatly shutoff

The problem is the latest update, the same thing happens to everyone with the map values, we installed the previous version and the problem is solved, I hope they solve it soon

Today i have do a check with my automotive scan tool Bosch , connected to the ecu K-line . The Map value in the Bosch is correct and stable but in the Kmanager is weird and jump from 2 kpa to 236 kpa.
He confirms that there is a bug in the 4.5.7 Kmanager software.

Your calibration runs correctly in our car. With the ignition on and engine off the MAP reads 0, which is normal. When the engine is started it reads correctly.

Edit: On a v1 board the map does not datalog correctly. That probably is your problem. We'll look at this.

Edit2: Fixed, will release tomorrow morning.