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The Reatta onboard diagnostic system is your best tool when troubleshooting your Reatta. Everything you need to know can be found here on ROJ if you take the time to learn about it. Just click on the Diagnostics menu at the top of this page. Once you learn how to access diagnostics I recommend learning how to check trouble codes first. Finding the trouble codes stored in diagnostics is a good starting point when you are trying to figure out a problem. Then get to know the Diagnostics booklet listed in the diagnostics menu. It will tell you all about how to use the onboard diagnostics to read data and how to use overrides to do tests that are really helpful in figuring out a problem. Play with the onboard diagnostics all you want. You can't hurt a thing and no changes you make are permanent. When you turn the key off and back on all changes you make with overrides are gone.

The 90-91 have that short harness on the front of the engine. It plugs in to the main harness on top of the engine behind the power steering pump. Earlier models are not wired this way and have no sub harness I am aware of.

Back safe and sound and 2021 PVGP in the books!!!!!

Thanks to the ROJ, I am learning a lot about how the touchscreen diagnostics work and can access /clear codes. I need to do more homework about overrides and all the crazy numbers. I feel like I have really narrowed down my current issue with y’all’s help.

Diagnostics are found in section 8D of the service manual. Are a few things you can change (options) but have to really want to.

Maybe, but I don’t think it will make much difference. The fluid pressure bleeds down overnight in any case although not completely.

This is where the ability to display engine parameters in the diagnostics is handy.

I do not know 100% on the routing but on the 89 parts car, I had a cam sensor code and I found a cut wire under the radiator area that fixed the code when spliced back together. I know the big silver wrapped harness across the firewall behind the engine doesn’t exist on the later models and my suspicion is that harness carries the cam and crank sensor harness among others. It likely ducks under and then across the front back to the engine