2003 Toxic Tacoma

[Fred]

Well, probably with plenty of arcing and rough engine behavior, but that's the spice of life.

Maybe in 5 or 10 years, if you still have it ;-)

I spent most of today feeling pretty ill and didn't make much progress.

Get well soon!

I'm motivated though and really want to get this done, so in an attempt to hold myself accountable and be more visible, this thread will start to see more activity.

Hooray, a technique that I've used for a long time and often recommend :-)

The Toyota ECU's been hacked up so that the stock PCB sits firm in the case with elbow room for the Jaguar.

Pics or it didn't happen. Don't be shy. Hacked means hacked, we all know it'll be a bit ugly, so out with it! :-)

This brings up an issue though: wire gauge for injectors, coils, fuel pump, etc. I've seen a variety of wire used in peoples' projects and in some cases I think the choice was "just good enough" for proof-of-concept runs.

Short answer: whatever fits. Longer answer: 0.1mm^2 would be enough for 1 amp of current that an injector draws. The issue is that over distance, you'll drop voltage, but you've got no distance in the case. The other issue is vibration killing thin wires FAST.

Ideally:

0.75mm^2+ for injector wires
almost anything for fp relay
almost anything for low current coil control signals
almost anything for all inputs
big as possible for grounds (plural, parallel = good)
smaller than grounds for power (but this only applies to the loom, really)

I'm also having issues reliably mounting the Jaguar into place, but that's not high priority at the moment.

Consider glueing blocks to support it, and siliconing the board onto those carefully. My jag-in-oem setup has it flopping, which is clearly not reliable, supported by wires, and regulators only. Icky. Also consider: viewtopic.php?f=67&t=2221

[ToxicGumbo]

Get well soon!

Thanks. Been a rough week, but looking forward to the brief holiday. Heard some good stories tonight from a "Gulf war" vet about the ingenuity of Iraqi militants (piano wire on roadways, ice packed grenades, etc.), improvised tactics in response, and being passed by a hoodless Hilux sporting a Chevy 350 engine.

Short answer: whatever fits.

Earbud speaker wire it is!

Pics or it didn't happen. Don't be shy. Hacked means hacked, we all know it'll be a bit ugly, so out with it!

^ Chopped and dropped from earlier. Some wiring's done, but not yet directly to the Jaguar. As mentioned earlier, part of the original circuit board remains to provide stability for the loom adapter. I might run USB through the center of the connector for easy access from the glove compartment.


For reference:



^ Stock Tacoma/Hilux ECU Location.




^ A drawing of the male connector onboard the ECU along with the active wiring scheme.

ECU - 89661-04760 (2RZ-FE)
--
(D)
1. (#10) Injector control output 1
2. (#20) Injector control output 2
3. (#30) Injector control output 3
4. (#40) Injector control output 4
5. (E03) Computer GND, ignition coil bracket
6. (E04) Computer GND, ignition coil bracket
10. (IGF) Ignition feedback
11. (IGT1) Ignition timing output to igniter 1
12. (IGT2) Ignition timing output to igniter 2
13. (IGT3) Ignition timing output to igniter 3
14. (IGT4) Ignition timing output to igniter 4
15. (RSD) Idle air control valve
21. (E01) Computer GND, ignition coil bracket
28. (KNK) Knock sensor
31. (E02) Computer GND, ignition coil bracket

(C)
1. (CCV) VSV/Canister closed valve
2. (VC) Throttle position sensor +5V
3. (HTB) Heated oxygen sensor control output
4. (AFHT) Air/Fuel Ratio heater sensor
6. (EVP) VSV/Evap
7. (TBP) VSV/Pressure switching valve
9. (VTA) Throttle valve opening angle signal
10. (OXB) Heated oxygen sensor input signal
11. (AF+) Air/Fuel Ratio sensor input to ECU
12. (THW) Water temp
14. (VG) Air intake volume from MAF
15. (G2+) Cam position sensor
16. (NE+) Crank position sensor
17. (E1) Computer GND
18. (E2) Sensor GND (MAF, TPS, water temp, vapor pressure)
20. (AF-) Air/Fuel Ratio sensor
21. (THA) Air intake temp from MAF
22. (EVG) Mass air flow meter
24. (NE-) Crank/Cam position sensor

(B)
5. (IDLO) To cruise control ECU
6. (FC) Circuit opening relay (fuel cut)
7. (TC) Data link connector
8. (PTNK) Vapor pressure sensor
9.
10.
13. (TAC) Tachometer
14.
24.
25.
28. (PSSW) Power steering pressure switch

(A)
1. (BATT) Battery
2.
3.
4.
5.
6. (W) Warning/CEL
7. (STA) Engine cranking signal (starter switch)
9.
10.
11.
12. (SIL) Data link connector
13. (AC1) A/C switch signal from magnetic clutch
14. (ACT) A/C cut control system
15. (STP) Stop light switch
16. (+B) Switched battery power (12V)
17.
19.
20. (ELS) Electrical load signal relay
21. (SP1) Vehicle speed sensor input
22. (NSW) Neutral starter switch



-Jeff

Edit: Wire/value additions, ECU pinout image change

[Fred]

Keen for a pic of the other side of the board to see how you're attaching the wires and perhaps flood you with unwelcome opinion before you do too many.

Re pin out, get your power and RPM sensors hooked up, put some heatsinks on the regulators, plug it in and get a lot of it cranking. That will be a gratifying and good start, you can expand from there :-)

Fred.

[ToxicGumbo]

That will be a gratifying and good start, you can expand from there .

Speaking of which, things to start shopping around for:

1. Cheapy Evo intercooler
2. TD05 16G
3. Lots of goodies and tubing
4. BOV set to be obnoxiously audible

Edit: Will have to weld up the turbo adapter as best as possible. I called about the welding class I wanted to take, left a message, and no response back yet. Lame.

-Jeff

[Fred]

Edit, 4. BPV unmodified with a small filter on it. Will make sufficient noise.

Unlike masterflop you listen to the evo advice. Good. :-)

However, focus on getting it running first ;-)

Don't be like Fred and by BOVs months or years before you need them... cough.

Fred.

[ToxicGumbo]

However, focus on getting it running first

Will do, but don't expect me not to plan ahead.

Don't be like Fred and by BOVs months or years before you need them... cough.

viewtopic.php?f=15&t=2258


-Jeff

[ToxicGumbo]

^ Proof that work is being done!

Adding loom routing information to earlier post.


-Jeff

[ToxicGumbo]

A few updates:

1. Spent some time this past weekend redrawing the ECU diagram (a few comments up) after double-checking the wiring and color codes.
2. Continued to trace electrical wires in the loom and match against scattered data sheets for exactness. These base models weren't as common as the higher end Tacomas, so this ECU has been difficult to get right. Still can't ID all the wiring.
3. Tinned up the remaining ECU socket connectors and located some pre-tapped blocks of aluminum to use as heatsinks for the Jaguar A3 regulators.

-Jeff

[Fred]

Why are you trying to locate ALL of the pins? Stop trying. Locate the crank sensor pins, power and ground pins, and hook it up!!!! :-p

Good to see progress, though.

[ToxicGumbo]

Locate the crank sensor pins, power and ground pins, and hook it up!!!! :-p

Sounds like a great idea!

- The power supply regulators on the Jaguar A3 are now bolted to aluminum block heatsinks.
- Tested the crank sensor per Fred's advice and determined it is, in fact, a VR sensor. Re-resistored the Jaguar A3 board for that.
- Crank+, Crank-, GND, and +12V are wired up to the ECU socket.
- The Jaguar A3 has the latest dev "listener" s19 file loaded.
- Made the mistake of blindly uninstalling EMStudio and tossing that version's installer in favor of downloading a newer copy. Turns out the newer copies won't run. My internet connection has crapped out for the past few hours and won't fully download an older archive.

I've been trying to get a good logging system going and now it's raining outside, so the actual cranking will have to wait until morning. I plan to hook the ECU up, start logging (worst case, I'll capture the crank data through "Terminal"), then run a jumper cable from battery + to the starter solenoid for about 5-10 seconds.

If all reads correctly, more inputs will be wired up and tested as rapidly as possible based on the updated wiring scheme a few posts back. Thanks to Fred and DeuceEFI for the encouragement, help, and occasional abuse.


-Jeff