91 explorer shifting problem

Andy91Explorer · 07-12-2010, 01:30 AM

Any one know what this dtc mean on my 91 explorer. I was able to pull these code from a scanner.

57- Octane adjust pin in/nps circuit fault

When i put the truck in drive or reverse it does not want to move forward until i rev it to about 4-5k. When it does start to move it shift really late about 4-5k. Check a/t fluid level is good and look clean, does not smell any burning smell. Anyone have any idea? thanks.

MrShorty · 07-12-2010, 10:02 AM

neither my code list don't nor BrooklynBay's code list mention the octane adjust pin for a 57. The lists I've seen simply refer to the park/neutral position switch circuit. It either suggests that you didn't have the transmission in P or N for the test, or there's some fault in the PNP switch circuit. Should be a fairly straightforward circuit and should be easy to track down, if you want.

The DTC and you transmission engagement issues are almost certainly not related. There's nothing electrical about transmission engagement on your A4LD. The engagement issue will be a hydraulic or mechanical issue, which I'm not very good at diagnosing.

Iron Weasel · 07-12-2010, 12:44 PM

The Octane Adjust Bar DTC just means that the shorting bar isn't in place on the jumper. It's nothing to worry about and is not related to the transmission problem.

07-12-2010, 01:30 AM	#1
Andy91Explorer Wannabe Elite Explorer Join Date: Apr 2008 Posts: 7 Vehicle Specs (Original Poster)	91 explorer shifting problem Any one know what this dtc mean on my 91 explorer. I was able to pull these code from a scanner. 57- Octane adjust pin in/nps circuit fault When i put the truck in drive or reverse it does not want to move forward until i rev it to about 4-5k. When it does start to move it shift really late about 4-5k. Check a/t fluid level is good and look clean, does not smell any burning smell. Anyone have any idea? thanks. Last edited by Andy91Explorer; 07-12-2010 at 02:16 AM.

07-12-2010, 10:02 AM	#2
MrShorty Wannabe Elite Explorer Spanish Fork, UT 92 XLT and '87 Bronco II Join Date: Dec 2001 Posts: 4,934 Vehicle Specs	neither my code list don't nor BrooklynBay's code list mention the octane adjust pin for a 57. The lists I've seen simply refer to the park/neutral position switch circuit. It either suggests that you didn't have the transmission in P or N for the test, or there's some fault in the PNP switch circuit. Should be a fairly straightforward circuit and should be easy to track down, if you want. The DTC and you transmission engagement issues are almost certainly not related. There's nothing electrical about transmission engagement on your A4LD. The engagement issue will be a hydraulic or mechanical issue, which I'm not very good at diagnosing. __________________ Mr. Shorty 92 XLT 4x4 87 Bronco II XLT 4x4 '98 Chev K1500 Suburban SLT 4x4

07-12-2010, 12:44 PM	#3
Iron Weasel Wannabe Elite Explorer Belen, New Mexico 1994 XLT 4x4 Join Date: Mar 2010 Posts: 589 Vehicle Specs	The Octane Adjust Bar DTC just means that the shorting bar isn't in place on the jumper. It's nothing to worry about and is not related to the transmission problem.