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1997 Ecoline with P0705: Erratic Shifting and TRS Diagnosis - E4OD or 4R70W Transmission?

Model: 1997 Ecoline Eratic Fault Code: P0705 Posted: 2016-06-22 10:15

I recently installed a new Transmission Range Selector (TRS) on my 1997 Ecoline, ensuring the alignment scribe marks are properly matched. The engine starts in Park as expected, but I'm now experiencing erratic shifting—now resembling a chatter or gear hesitation where the transmission seems unsure of which gear it's in. I have a Diagnostic Code P0705 and want to determine whether the TRS is faulty or if another component is at fault. I'd like to know how to properly test the TRS unit, what diagnostic steps are recommended beyond checking for damaged terminals or corrosion in the harness, and whether there could be an issue with the transmission itself (such as E4OD or 4R70W compatibility). Could you recommend specific tests or procedures to isolate the problem? I've already confirmed the shift cable is functional and replaced the TRS according to manufacturer specifications.

Related fault codes
P0705
Comments (3)
Anonymous 2016-06-22 11:27

Please scan for diagnostic codes—even if the check engine light is off. Is this vehicle equipped with an E4OD or a 4R70W transmission? Describe the nature of the erratic shifting (e.g., sudden gear jumps, hesitation, chattering). Also, why was the TRS replaced originally? Your post lacks key details needed for accurate troubleshooting—please clarify these points to help guide diagnosis.

Anonymous 2016-06-22 12:03

I initially suspected a faulty transmission range selector (TRS), but that turned out to be due to a worn shift cable. I replaced the TRS with a digital unit and aligned it precisely using the scribe marks as per specifications. After installation, shifting was slightly erratic—initially I thought it might be engine lugging. However, over time, the issue has worsened, now resembling a gear chatter where the transmission appears to struggle to engage or hold gears. The current diagnostic code is P0705. I'd like to test the TRS to confirm if it's faulty, or whether another component—such as the transmission control module or solenoid—is at fault.

Anonymous 2016-06-22 14:07

I can't attach documents such as trouble trees directly, but here are some helpful resources I've saved: - https://www.youtube.com/watch?v=D8DAnlHCffI - https://www.youtube.com/watch?v=r8QJX-MWkBU