To start. I drive a 95 prelude h23a1 block h22a head. Gt35r turbo set up. Nothing left stock and its built.

This set up I am running worked and ran just fine while in my 92 prelude. I had an opportunity to buy a rust free 95 prelude so I did. I swapped everything over. I had a few issues. With the hondata CPR Kit install. I fixed those issues. Too only to be hampered by another one. I got spark and fuel. Its cranks but won't start.

NOW; I get a CEL for 5 short blinks. MAP Sensor is 3 to 5 blinks. I checked my map sensor. Its Connected and it's a omni 4 bar. Checked the hondata S300 and it has 4bar omni selected. So why am i receiving this CEL? Can it be caused by something other than the sensor?

 

Yup, it could be the ECU itself. I had a TPS and MAP error code when I changed out the old ones and then dug into the wiring.. It all checked fine until it came down to the ECU. Replaced that and bam, errors gone. Good ol' days! Grab yourself a multi-meter and get to crackin!!

 

Are the tps and map sensor connectors flipped? Those are the only 2 plugs on the harness that are the same.

 

I traced the harness from the prelude dealership manual and its the right plug. At least according to the diagram.

The color wires I have for my map sensor is blue white blue and red yellow. Is that correct?

 

According to this, those colors are not correct.

 

Thanks for the diagram. I'll double check that.

 

All my wiring is correct. Right plug to right sensors.

Still cranks no start. CEL for map sensor.

I'm about to try and wire in my zeitronixs map sensor.

 

All my wiring is correct. Right plug to right sensors.

Still cranks no start. CEL for map sensor.

I'm about to try and wire in my zeitronixs map sensor.

 

Is this correct? Also i found my TPS wire was not connected to the ecu. Would this cause a map sensor CEL?

 

Explain this a bit better, please.

 

My TPS had to be wired into my zeitronixs kit. When I did my wiring and soldered everything together i guess I missed it. So I soldered it together and still have the same issues.

I have now tried 3 map sensors. A 92 prelude stock, omni 4 bar and a 98 accord vtec map. Same results. Crank no start 5 blinks from the CEL.

I tested the harness and plug for 5 volts. The plug is recieving power. The car ran just fine before the motor swap. And the swap ran fine in the Old prelude.

What else can cause a MAP sensor CEL?

Note* when I loaded my tune off the hondata it had the setting for stock MAP sensor. I changed it to omni/hondata 4 bar. This really wouldnt cause this issue right? It was tuned with the omni 4 bar.

 

Test voltage at the map sensor plug with the key on, engine off. All 3 pins, what are your readings and on which wires?

 

White/blue 2.9
Blue/ white .16
Red/white 2.8

All in volts

 

Oh yeah, that's fucked. 1 should be 5v reference, 1 should be ground, 1 should be 5v signal (0-5v based upon manifold pressure).
Wiring is wrong or ECU is fried. Probably a fried ECU at this point due to fuggered wiring.

 

Which one is supposed to be ground?

 

This is where a manual is helpful! Should be able to find a schematic by teh google. I got ya going with some basic info. Your wiring is evidently not stock also, that's not helping much on MY end as I dont know what was changed, what it was changed to, or how you're intending it to work for your setup. Help a fella out here!

 

The harness to this map is the stock.honda harness. I.bought the omni so I could plug and play. It was on the stock.harness in my 92.

The ecu is a P28 with s300 V1 with software updated to the newest. So I can.run coil.packs.

The coil pack kit is the only thing wired in besides 3 wires for my zeit kit.

 

UPDATE!!!!
Found out the multimeter I was using was not calibrated right and broke.

I went and bought a automotive multimeter. I have the following readings with the car turned to accessory: 5v power .02 volt ground 3.xx volt signal

Clearly not supposed to have power in signal if the car is NOT running. Tested the wire continuity. Wire is fine. Got the beeping from the mulitmeter. So it's an HONDATA/ECU issue. anyone ever have this same problem?

 

Yup. Have had this problem twice in the lifetime of my current civic. It is NOT your Hondata but your ECU. I've replaced 2 ECUs myself in ~4 years. Order a Hondata socketed ECU from HAmotorsports, you'll be plug and play. Switch your Hondata board from bad ECU to new one and done, AND it has a warranty. Can't beat that with a stick.