2JZ CAS wiring

[Norbie]

Hi all, I'm trying to figure out the polarity of the crank angle sensor and cam angle sensor on my 2JZ so I can hook it up to a Haltech. I've been searching high and low for wiring diagrams but can only find info on USDM engine which of course use different wire colours.

I know plenty of people here have hooked up aftermarket ECU's to JZ engines so hopefully someone can help me out here?

Crank sensor has two wires, black and white. Cam sensor also has two wires, red and green. Once I know which is which I should be able to start the engine!

[BigWorm]

I put an Autronic on a 1J recently (black & white wires for both cam sensors & the crank sensor), & after discussion with Mos & "disassemby" of the loom I found the white cam & crank trigger wires were all common (joined just before the ECU), so I used that as negative.
Do 2js have two cam sensors? Are any of the wires common with anything else?

[wilbo666]

Yah 2jz have two cam sensors, the problem I suspect is that norbie has muted all his wiring now and can't trace it back to the ECU...

In hindsight he perhaps should have traced back the CAS and CAM wires to the ECU pins, and used the available ECU pinouts to work out what was +ve and -ve

You're right tho, the -ves are all just GND (inside the ECU)!

Cheers
Wilbo

[Norbie]

Yes the 2JZ has two cam sensors. I don't know if any of the wires were "common" (I long since snipped off all the sensors I needed from the loom) however the other cam sensor also has black and white wires so there's a good chance it used a common negative.

In the absence of any more definitive info I'll assume the white wire is the negative and hope for the best!

[The Real Roadrunner]

if your just using the orig plugs it shouldnt make a difference as to which is neg/ground, its just a mag sensor but from memory white is the std ground.

the one thing that may catch you out is which cam sensor to use and im not sure when they want to see the sync sig, did you try calling haltech? they should be able to give you the info over the phone.

cheers
linden

[Norbie]

I bought the Haltech from another 2JZ owner and he had it setup to use the front sensor, so that part is sorted.

Another related question, the shielded cables are about 10cm too short to reach the Haltech, will it make a big difference if I bridge the gap with ordinary wire or is it necessary to have shielding all the way?

[CrUZida]

1UZ definitely made a difference when the wires on the sensors are around the wrong way.

Timing was out about 30degs with the Microtech when incorrectly wired.



Norbie, just hook em up in what ever combo you like.
If the car runs, lock the timing on the Haltech and get out a timing light.
Then see if the timing on the engine matches the ecu.
If it doesn't, then change one of the polarities.

Mine only ran on 2 of the 4 combinations, and one of the 2 that ran put the timing about 5 deg out (and then had a panic attack at about 4000rpm and up)

[Norbie]

The trial and error method is always a possibility, but Wilbo has offered the use of a CRO if I get desperate.

I'm starting to wish I'd just forked out for an E8, not least because you can buy plug-and-play 2JZ harnesses for them!

[wilbo666]

if your just using the orig plugs it shouldnt make a difference as to which is neg/ground, its just a mag sensor but from memory white is the std ground.

cheers
linden

Yeah as said, twill make a difference.

The haltech manual says that it expects the waveform to rise before it drops, if the polarity is wrong then that won't be the case (it will be the other way around)!

Cheers
Wilbo

[thechuckster]

as suggested in the build thread - put a 'scope across the sensors, crank the engine and look for rising signal

[The Real Roadrunner]

Yeah as said, twill make a difference.

The haltech manual says that it expects the waveform to rise before it drops, if the polarity is wrong then that won't be the case (it will be the other way around)!

Cheers
Wilbo

that would be the reason i pay ppl to wire cars for me would it also depend on wether you set the ecu to trigger on the rising or falling edge?

cheers
linden

[The Real Roadrunner]

the shielded cables are about 10cm too short to reach the Haltech, will it make a big difference if I bridge the gap with ordinary wire or is it necessary to have shielding all the way?

which sensor? if its the cam then id say yes cause of the injectors being near it. oh but the alternators down near the crank pickup so it too may cause dramas.

ill leave it to wilbo or crUZida

[CrUZida]

I had a gap of about the same in my installation.
I stripped a few cables and wrapped it around the shields to join them.

I'd highly suggest doing it, as anything after the gap will not be shielded.

[triptek]

When i wired up my microtech i had to wire the crank and cam sencer the following way.

crank sencer:
black wire = ground
white wire = + trigger

cam sencer
red wire = + home
white wire = ground

I know we're talking about haltech wiring here, so it might be different. But this might help.

[thechuckster]

if the microtech was looking for falling edge for the zero crossing then would be the same -