Idle issues, no start, map error etc (m103 55pin ecu)

masab007

i was having intermittent Idle switch problems, replaced the switch didnt fix

so i moved the signal from pin 47 (closed throttle signal) to Pin 10 Deceleration fuel shut-off microswitch)
and now the idle switch works reliably

but still getting a MAP error, put a new MAP in still the same error, havent checked for 5v at the sensor but i dont know how to proceed?

what if i have 5v at the sensor, and what if i dont?

also why would my PIN 47 not send any signal?

JHM

MAP erros are tied to the switches. Probably switches are not sending correct signals.
Record a log of startup and short drive.

masab007

JHM i can record a log today but the vehicle is undriveable, stalls doesnt hold idle, runs extremely poor

JHM

masab007
leave idle valve on stock harness

masab007

So all the switches are functioning correctly, tested with the software and multimeter, they all work

idle control valve works when supplies with voltage, the ecu is also sending out correct signals to move it

but here are the logs, as you can see it doesnt start unless i have the throttle

log-jetronic-0883-v4018-20240625-200842.csv

51kB

log-jetronic-0883-v4018-20240625-200117.csv

44kB

log-jetronic-0883-v4018-20240625-195739.csv

43kB

all the way to the foor

JHM

You have MAP sensor failure, the ECU is operating in emergency mode.

masab007

JHM will replacing the MAP fix it? i have a new MAP and is there a way to reset the ecu?

JHM

Replacing the map sensor will fix map sensor issue, and then we will see.
ECU resets itself when ignition is off.

masab007

JHM

replaced MAP, no more error

now its a no start issue, tries to fire up but doesnt

i think the IAC is bad, because ecu is sending correct signals but as soon as i connect it to the iac, zero volts/hz on either wires, got a replacement

but would it be anything else?

JHM

Calibrations can be messed up. Reupload calibrations for your engine.

masab007

reuploaded calibrations, new ICV but it doesnt move when i change the slider (autosave is ticked, even tried manually uploading)

should i try wiring the icv back to original ecu?

masab007

IAC is fully functioning now, (connected it back to the original ecu)

car hesitates to start (doesnt start) but as soon as i put a little bit of starting spray it starts right up but doesnt idle, seems like not enough fuel during idle

SyntaxError

Looks like i have the same issue on my Golf PL Engine

JHM

check this:
https://invent-labs.com/jetronic/docs/en/setup/firststart.html#throttle-switches

masab007

Throttle switches are working fine, exactly like whats noted..
seems like there is an underlying issue

is there a better way to get diagnosis other than the logs ?

masab007

log-jetronic-0883-v4018-20240723-170708.csv

65kB

here is the latest log file
this is the best it ever ran, started up after long crank then idled high and just stopped

car has gas, fuel pressure, spark (everything on the spark side is new and was functional before the efi swap)

JHM

The engine is hardly making any power. Looks like lack of fuel pressure.
MAP sensor is working ok.
Check if spark plugs are wet after run like this.
Try to hold higher RPM with pedal.

masab007

is the fuel line in correctly?