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BMW 3-Series (E90 E92) Forum
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Weak starts, voltage issues?
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05-20-2024, 07:49 PM | #23 | |
Brigadier General
2991
Rep 4,345
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Quote:
1) Lack or Power Supply/Ground to FRM. Your tests have ruled that OUT. 2) Lack of Bus Communication, in this case, K-CAN bus communication; see Below. 3) Internal Fault in FRM. Since you have TWO FRM's with SAME symptoms, vehicle wiring issue Statistically MORE Likely. See First wiring diagram at Post #21. So at this point, we're down to: A) Examine K-CAN Pins/Sockets/Wires at X14260/45 (Green wire) & X14260/46 (Orange/Green wire); B) Test Voltage at each of those two sockets of X14260 with that Connector disconnected & Ignition ON. Report Voltage Readings. C) If everything OK in those tests, then BOTH FRM's must be faulty. Send original to Module Repair Shop. Get Money BACK on replacement if repaired original works. George |
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hi rpm12.00 |
05-24-2024, 08:21 PM | #24 | |
Private
12
Rep 54
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Quote:
45: 4.5v 46: 0.5v (I also took them with ignition switch off just in case that's relevant. 45off: 11.23v 46off: 0.217v) Original module currently on the way back, and I know the best ways around town without turn signals. |
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