Recently got a E6X installed on my TII. When we went to log on the laptop, my MAP sensor is reading 13.2 psi with ignition on and motor not running. Thought it was strange then swapped it out with a friend's MAP sensor and it read 26.6 psi in the same conditions.

I tried calling SMP but no reply. So what could it be? I'm about to buy another 3 bar sensor just in case these two are bad. I'm unsure of the condition of my original MAP but I know my friend's MAP that we swapped was new.

A bad wiring install? Already checked grounds and all are good. MAP is connected directly to the intake manifold without a T. Car would barely start on my MAP but because its reading 12psi, the timing it making it rough and die after a minute or two.

Any help would be great. Car has been this way for 3 weeks with no luck.

- Kevin

 

Oh, and if makes any difference..

Car is a 89' TII with 13BRE Vmount with a hybrid turbo. E6X, block off plates, and two stroke oil.

 

either wired up wrong, or it's not set up correctly.
does your ecu have the internal map sensor as well?

who did the install? was it running before--is this something that happened all of a sudden, or fromt he beginning.

 

It sounds like the map sensor wires are wrong and the ECU is seeing the 5v feed, this would explain the high map value. The other option is (but is less likely) that you have the incorrect map sensor selected on the software. Either that or the map sensors you used are bad or the wrong scale (2 bar, 1bar maybe?).

Check the colors on the wires going to the map sensor, its orange for 5v, black for ground and yellow for the signal, the pins on the map sensor are A ground, B signal and C 5v. If they are any other colors than this, trace the wires back and find the original haltech harness wires.

 

my friend did the install. he did his own and worked fine. I'll check those three wires. been so busy lately and the air temp outside isn't helping. already over 100 degrees outside.

 

So depending on how you mount/look at the MAP sensor, it should be black/yellow/orange... or the other way around.

I checked down into the harness just in case the wires were lengthened or switched. All looks fine.

What do you guys think?

 

ok, I took tonight off to take everything out.

I opened up the harness to expose all the wires and they all look good. A couple of fishy saulders that I've replaced with wire crimps and connectors.

But still the same problem. My last resort is to send in the ECU to Haltech. But we tried it on Grats car and it worked fine. I don't understand how it could be the ECU.

I guess this is my last stand. If it doesn't work, then look for the car in the for sale section or ebay.

Thanks guys. Any ideas?

 

where is the car?

 

Phoenix, Arizona

 

bump up... any help?

we've went thru the whole thing with a multimeter.

I tore the whole harness back out to check everything. The 5v wire gets its 5v but the signal wire is getting 2.2v. Is that correct?

I checked the signal wire, and its not touching any other wire and goes straight from the ECU to the MAP sensor. I bought another new MAP sensor and now its reads -1.0 psi. Car starts up fine. I set the timing but the MAP sensor reading stays at -1.0 with the car running.

Also the new MAP sensor gets hot after a few minutes. I'm guessing its the 2.2v that the signal wire is getting.

Any help? We'll all stumped here.

I'm considering on sending the ECU back in to get fixed.

 

The signal wire has almost 2.5v on it without the sensor plugged in. There should be nothing going on, on that wire. His 5v ref. and ground is fine. We checked continuity on wires, and did a voltage drop on the signal wire. Everything was what it was suppossed to be(excluding the 2.5v of the signal wire.)

Everything is pointing to a bad haltech.