1997 MERC W202 C250 - diagnostics / gearbox help

60six Posted a lot (╯°□°）╯︵ ┻━┻ Posts: 1,587	1997 MERC W202 C250 - diagnostics / gearbox help 60six @60six
	May 18, 2023 19:21:32 GMT
	I have a mate with a lovely w202 c250 mercedes estate - It recently went into limp mode and is stuck in second. I have a genuine autocom diagnostics tool with the correct 38pin adapter and I can read codes etc on the main ECU, but when it comes to the gearbox ecu - nothing. fails to connect. The main issues are : - nothing online - diesels & petrols of pre OBD era are completely different and the tool I wanted to use, HFMscan does not work with diesels. Autocom gets further but again fails when it tries to connect to the TCU (transmission control unit) The reset procedure appears to do nothing too - various door closes and igntion switching - still stuck in second Does anyone know anything else I can try? - There is a unit called carsoft 7.4 but it isn't available and is a chinese copy anyway
	Some 9000's, a 900, an RX8 & a beetle

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Woofwoof Posted a lot Posts: 1,108	1997 MERC W202 C250 - diagnostics / gearbox help Woofwoof @woofwoof
	May 18, 2023 21:35:05 GMT
	In a nutshell you need to use an OBD scanner with a 38 pin adapter that's capable to diagnose transmission fault codes. A genuine Carsoft 7.4 will but there's others like Autotel etc. Stuck in 2nd is not an uncommon fault, can't remember the causes but a search on web should help.
	Still learning...still spending...still breaking things!

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automax Part of things Posts: 19	1997 MERC W202 C250 - diagnostics / gearbox help automax @automax
	May 26, 2023 12:22:14 GMT
	Start by looking at the gearbox wiring where it plugs in to the gearbox. When the internal seals fail on these and the connector and its adaptor get oil in them it can cause all sorts of issues. Replacement connector adaptor is only 20-30 quid if so, but be careful undoing the 7/8mm bolt down the middle as they can break and then you need to taker the valve body pack out to get them remaining part of the bolt out.


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