Almost running 1mzfe swap (problems...)

[evildnb]

So, 3 years into this project and I'm FINALLY almost done.. I'm in the middle of wiring this car and its a real test of my patience and intestinal fortitude. This is where I stand: 2001 1mzfe in a 92T chassis. The engine, wire harness and ECU are for a 2001 avalon without immobilizer as verified by 2 separate toyota dealers via the vin number.. everything is wired according to the excel file newbiewan (I think) posted here, with the exception of the MREL wire and maybe a couple of other wires that didn't match up on that 'how to' no coolant in the car yet. no power steering fluid. and no front O2 sensor. also I don't have all the vacuum lines hooked up. otherwise everything is on and wired.


I've looked over the wiring diagrams for the 2000, 2001 avalon and the 2000 camry/ solara..it all seems to be the same. the ecu connectors used for the camry/solara and the avalon are the same, but toyota labels them differently;
avalon ecu connectors: E4 E5 E6 E7 E8
are the same connectors as
camry/solara ecu connectors: E11 E10 E9 E8 E7
the pinouts all seem the same too, the problem I am having is with (B+) I've run that wire to about 30 other wires, I've grounded it, put 12v constant to it and left it unconnected..I get the same result everytime = engine turns over, fuel pump runs but the car wont start.

..could the lack of O2 sensor, coolant and/or vacuum line connections be what is keeping the car from running??? or does that not make a difference and it all bad wiring? where should the B+ wire go?

[DaveMush]

the ecm requires two battery positive inputs, one switched, one constant.

Most of the sensors also require a B+ input to operate (A/F or O2 sensors, Vapor pressure sensor, pressure switching valve, IAC, all of the VSV's in the valley of the engine, the closed canister VSV at the airbox, the MAF, and the DLC3 connector.
its also needed for the Immobilizer ID code box, but you can nix that if you are sure you dont have the immobilizer.

I would also hook up the vaccum lines as engines dont like vaccum leaks.

If you have grounded the B+ wire, i would look to some blown fuses. get out the DVOM and start tracing wires.

[evildnb]

I checked all the fuses after every wire combination, blew a couple but replaced them.. I forgot there are 2 vsv's i don't have connected (as I wasn't planning on using them and I don't even have them anyway) the one at the air cleaner and the one on the motor mount. As far as i can tell they are only used for the evap system that I was planning on NOT using. If this is something I MUST have for the car to run, then I need to go out and buy these parts. Can anyone confirm that the car will run without this or is it a must that i have the evap all set up properly??? also I don't have the OBDII port, do i need that as well?

[JimKing]

You don't need evap related stuff or the OBDII port to start and run the car, but you should hook up the OBDII port so you can plug a scanner in to get error codes. It will make your life easier in the long run.

Make sure you have fuel pressure... Make sure you have +12v to everywhere you should when the ignition is in ON position.

[V6'er]

OBDII port - Not only in the long run, but you might be able to scan the engine now (key ON, not running) to see what codes you are getting. It might tell you what's broken.

[evildnb]

OK, I guess its time to source a OBDII port for this thing..anyone know how to wire it up?

[DaveMush]

keep in mind that the ecm uses IGSW as a switched 12v reference input, and uses that to then send out a 5amp protected 12v(+) to the main relay via MREL. It tries to turn on the main relay when it gets the signal that the ignition switch has been turned on.

make sure you have the main relay wired appropriately.

[V6'er]

Dave, I didn't use MREL at all. Neither did Mike (Newbiewan), until he tried to program a key, which then failed. I don't have an Immobilizer, so I've never needed that circuit.

As for OBDII wiring, it's all in the BGB schematics. Use both Ground pins, some scanners expect both.

[Jason.MZW20]

Originally Posted by V6'er

Dave, I didn't use MREL at all. Neither did Mike (Newbiewan), until he tried to program a key, which then failed. I don't have an Immobilizer, so I've never needed that circuit.

As for OBDII wiring, it's all in the BGB schematics. Use both Ground pins, some scanners expect both.

I nixed it as well, though it serves a purpose in the 1MZ chasses. According to official Toyota papers, the ECU uses reserve power on MREL (main relay) for 2 seconds to set the initial adjustment on the IAC valve when the engine is shut off, so on restarts, it's already set.

The rest of the MREL circuit is the immobilizer, as the ECU takes command of the main relay.

[evildnb]

Thanks for all the input guys..I haven't had time to work on this thing since last Friday. I should be able to start working on it again this Sunday or Monday. With any luck I'll have it running buy this time next week......hopefully.....

[Oteck]

so if you bypass the MREL wouldn't that make the immobilizer useless?

[V6'er]

^ It did not for Newbiewan. But, he needed to wire the MREL relay when his key went bad and he had to program a new one.

[DaveMush]

no, the ECM will actually cut fuel and ignition when the immobilizer is set.

[V6'er]

Originally Posted by V6'er

^ It did not for Newbiewan. But, he needed to wire the MREL relay when his key went bad and he had to program a new one.

Ah, I misunderstood the question. Silly me, sorry.