The dreaded Trans Failsafe Mode (again)

[upallnight]

Originally Posted by Siggy

My scanner came today. Bought the 520 off eBay on Friday, came today, Monday, from the other coast. I don’t buy much off eBay, but $159, free shipping. The guy has sold many, so I took a chance and it looks like it worked out.

Plugged it in, ran the auto scan, saved that, then reset everything. Transmission failsafe error is gone, transmission working perfectly again. After a few miles, the check engine light returned with the same error it’s had for months, P1093. I’ll chance that down now.

I’ll also work on a graph of the alternator. If anyone can kindly direct me to the right path to get there, I would appreciate it. Looks like learning the diagnostic tree structure is going to take me some time. Not knowing what’s available or what many of the acronyms stand for, it’s a little slow navigating.

But super happy so far. Money well spent.

When I had the P1093 (error code with the gear display light on the dash) I traced it to a bad MAF. Check the MAF and see if the PO replaced it. If it is not a Siemens MAF there's your problem. Spend the money and buy a real Siemens MAF or if you can't afford a new one, go to a pick N pull and find a real Siemens MAF. You can also look at data from the MAF with your new toy. What rate of air flow is the scanner reporting (g/s)?