Issues with piggy back Air fuel 'interceptor'. Dam car's ecu safe mode kickin in.

[bajachris88]

Hi. I wasn't too sure where to put this. But its rendered my car disabled.

I have just assembled a jaycar Digital Air fuel controller to intercept my 0 to 5 volt output on my MAP sensor on my 1990 5sge celica (5sfe ecu).

The input and output voltages are all great, no worries, as the signal has to go through the circuit when its turned off, but it just bipasses alot of the chips/processors. But! the ecu kicks into safe mode as soon as the controller is turned on and the signal gets processed, despite having a right voltage output and set to an 'unmodified' signal.

It triggers the 5sfe ecu to give me an engine warning light in regards to the MAP sensor and goes either into this gay gutless safe mode or stalls.

How can i get around this? Is there a way i can get the ecu to just relax and chill and take the signal?

Regards,
Chris.

[bajachris88]

bump

[Pineapple]

See if this helps:

Did you turn it on when engine is running? There maybe a short loss of signal which the ECU see as something wrong. Try to leave unit on then start the engine. You may need a power source which doesn't turn off when you crank the engine. ECU power is a good one to tap.