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NavyPhil

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  1. Lexus 1996 ES300 (217k miles) Transmission Problems Non-Automotive engineer (but years of computer experience) needs help. Situation: About 6-7 weeks ago, while backing from driveway, the Overdrive (OD) disengage light came on, partially. Backlit in gray vs. usual yellow when fully OD disengaged. OD Light then gradually went back to dark. Car then failed to up-shift as speed increased to highway speeds. RPM’s showed significant increase. Car obviously straining at 65MPH. Stopped at my Mech shop which specializes in Acura, but has one Lexus-certified mech.. Local (trusted, non-dealer) mechanic tested, and repaired/replaced/troubleshot as cited: ‘Repaired multiple issues with SL/Overdrive circuit. Replaced wiring harness (TOY8412)with repeated shorts in it. Replaced ECU (BW452136) and reprogrammed as required. Rechecked…and found continued cycling short with SL control solenoid. Replaced SL control solenoid within valve body and checked for proper operation. Reassembled and reset engine specs. All normal. Extensive road test. Normal ops.’ In numerous verbal discussions with the shop owner, provided more details on processes used, including a visit to a local east coast Tranny shop, whose solution was to “replace the transmission”($3,000++) , until the question was asked, “Who pays if this does not solve the problem?” Recommendation was withdrawn. Mech says all pressures within unit are right on spec. It is not mechanical. Car back to me. These actions brought back to normal operations for several days. Problem has now resurfaced. Mech has over 30 hours total time in diagnosis and repair. Has billed me for 5. I’ll have no more charges. Wants to take the car to local Lexus dealer for their “formal” assistance at his expense. Anyone know of a structured (ISO-type) diagnosis process for isolating ECM/SL/Transmission control system electronic/electrical interfaces to isolate this “bug”? It does not appear to be heat or distance related. It did first occur after the car was (safely) driven through a torrential downpour. (Appears that the flex exhaust pipe with catalytic converter is also in need of replacement. Any way converter-related??) Any assistance appreciated. This shop owner is a good guy and I would like to save him some money if possible.
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