'96 Rav4 with Toyota 3sfe

[Jamesl]

I have successfully 'squirted a 1996 Toyota Rav4 using the completely stock ignition system and a DIYPNP kit from DIYAutotune. I didn't have to change any of the stock wiring, the MS unit plugs into the existing harness and the only change under the hood was to disconnect the vacuum hose running to the stock MAP sensor and run a hose to the MAP sensor built into the MegaSquirt unit.

The key to making MS work on the RAV4 was figuring out the ignition system and idle control. My '96 model has a distributor with a cam angle sensor built in and a crank angle VR sensor that monitors a 36-2 trigger wheel mounted on the crankshaft. In the end, I ignored the cam sensor and just used the signal from the crank sensor. Once I figured out the right settings, the car fired on the first try.

To make the idle work, I had to build an add-on splitter circuit and set up the software for PWM Closed Loop operation. It idles fine throughout warmup and in stop-n-go traffic.

You can read a "how to" article on the project, including some screenshots, here: "How To" article

[Matt Cramer]

Very detailed writeup, thanks for posting! Mind if we host a copy on the DIYAutoTune.com site?

[Jamesl]

I sent a copy to Jerry a couple days ago. You're more than welcome to post it.

JamesL

[Matt Cramer]

Thank you. This may be a busy week, but I'll try to get it up soon.

[pit_celica]

Hi, very nice write-up!

I have one question :

On your Warm-up Enrichment settings screenshot, the curve never meets 100% when the CLT temp is over 160°F. This mean that the engine is always at 110% WUE (10% more fuel) under normal operating temp. This is not right. I would make the last value in your WUE curve setting to 100%. This way, the engine will be out of the Warm-up enrichment at operating temp (as it should be).

Hope to help!

Sam

[Jamesl]

You're right. Thanks for pointing that out. I adjusted my msq and fixed the article.