MSPNP ALERT!
Link: MSPNP2 Gen 2 Toyota MR2 or AE86 Corolla
Applications
- 1985-1989 Toyota MR2 Naturally Aspirated
- 80’s 4AG Corollas with the VAST ignition system
- AE86 models
- AE92 models
- The basic info here can be used, with mild adaptation, for basically any Toyota with the VAST ignition system
MS-II PCB3.0
As with the other implementations, start by reading Jamesl’s document linked here: Jamesl’s Article
This actually isn’t all that different from the MS-I PCB3.0 with MSnS-E installation, the ignition input comes in on pin24 and needs a 12v pullup. The ignition output goes out on pin 36, here’s a difference though, you DO NOT need a 5v pullup on the ignition output with the MS-II as it has this pullup built-in. One other difference… you don’t need to do any mods for TVIS control as you won’t be using the FIDLE output for anything else so you can configure it as a ‘spare output’ and use it to control a relay controlling the TVIS system.
Mods Required
For the ignition input:
Use the Hall / Optical ignition input (step 50a) and jumper TachSelect to OptoIn, TSEL to OptoOut, and XG1 to XG2. We also need a 12v pullup. Install a 1k resistor between the right side (non-band) end of D1 and the left leg (banded end) of D9.
TVIS Activation
No mod required unless you are using FIDLE to control an idle valve, which on most MKI MR2’s isn’t needed due to the mechanical fast idle valve. So assuming you’re not using an FIDLE valve, just use pin30 (switched ground) to control a relay that triggers the TVIS solenoid.
Wiring
You can follow Jamesl’s original MS-I PCB2.2 document for building out MOST of your harness adapter. The exceptions are pin30 is now your TVIS control, and pin36 is now your ignition output. Otherwise you’re good to go.
This is laid out about as step by step as any MS installation out there as this one is very well researched and documented, and I’ve got a lot of hands on experience with it and experience helping others accomplish it as over the web as well. The nice thing about using this documentation is when finished you have a nice little plug-n-play adapter to use that makes a neat little connection into your stock wiring harness without hacking anything up.