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Question

hello, i just bought a 2002 330i and the owners manual is missing. i cannot find the fuse box.please help , also my check engine light is on. the code is po741 torque converter ckt performance or stuck off. what the hell is that. please advise. thanks mark

Submitted: 458 days and 16 hours ago.

Category: BMW

Value: $20

Status: AWAITING CUSTOMER ACTION

2002 BMW 330i

Already Tried:
i have erased the code with my handheld computer but it comes back on after several miles.the car runs and drives fine.the cigarette lighter does not work so i am searching for the fuse.

Accepted Answer

Hi Mark-

   The fuses for your vehicle are hidden behind the glovebox. Open the glovebox and there is a cover which needs moved to access the fuses. Sometimes the covers are on the "roof" of the glovebox with two small quarter turn fasteners, other times it is more forward with two little push in tabs to release.

   There should be a pictogram in the box as to what fuse is which, but it is fuse 47, a 20amp for the lighter. The numbers are VERY hard to read on the fuse box, so grab a flash light and a pair of glasses.

   The code which you are getting is for your torque converter clutch. A torque convertor is how an automatic car transfers power from the engine to the transmission. It has a clutch on it to allow the two to lock together when cruising a steady speed. This helps fuel economy. Your clutch is stuck off, so you are never making this connection to help economy. Nothing to leave you broke down, but will cost several MPG on the highway.

-Jared

Accepts:
Expert:	Jared
Pos. Feedback:	100.0 %
Answered:	8/19/2008

Service Advisor

Level 3 Certified BMW Service Advisor

458 days and 5 hours ago.

Reply

hello, how do i fix the torque converter problem? thanks mark

Posted by Jared 458 days and 2 hours ago.

Answer

The torque converter clutch (TCC) is activated when several parameters are met, including drive gear, engine rpm, torque into converter, and TCC activation pressure. When the computer senses there is slippage, it sets the SES light.

Likely causes include a faulty pressure control solenoid to the converter or converter clutch itself. The solenoid is located in the valvebody of the transmission (requires pan removal). The converter clutch itself could also be worn and no longer holding. This would require complete R&R of the transmission to repair.

Without a GT1 diagnostic tool to do some more in depth testing, I cannot say answer "XYZ" will fix your issue. Unfortunately, getting into transmission repair is really a shop project, more so than a do it yourself project.

-Jared

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