1.3 Motronic Up-Grade & 2.7i How To

[ASEHugo]

There's a 6mm threaded hole in the battery tray, worked for me.

I ended up settling on this, using the underside of the rear coolant overflow tank mount. I wire wheeled and cleaned the bottom surface down to bare metal, mounted the cable to the bracket as usual, and flipped it over to mount it.

Not sure why one of the pics is upside down, they were meh anyways but I hope they convey what my idea was. Thoughts?

[ForcedFirebird]

Should work fine as long as you have good contact. The one I use is in the last pic in your post.

[herschelcv]

Hi, I'm hoping someone can help me with the below C101 pin#14 and pin#15 questions. I just finished replacing 87' 325e auto with 88' 325i manual and Motronic 1.3. The car came with 89' 325i cluster. So far, I finished connecting two wires (econometer and tachometer) from C104 connector to the 88 325i ECU (Motronic 1.3), disconnected pin#20 at C101, and wired the auto to manual reverse.

1) C101 pin#14 (speed signal out to ECU) - How do I wire the vehicle speed input from the cluster to the ECU? My car, although it has an 89' 325i cluster, there is no wire coming out of C2 pin#10(white plug) and to the C101 chassis side pin#14. Because of the 325e chassis, C101 chassis side pin#14 is not used so no signal going to the ECU. Currently, the vehicle speed output wire (C3 pin#26, BR/RD) from the cluster goes to the OBC/multifunction clock. I am wondering if I can simply splice C3 pin#26 wire from the cluster to the ECU pin#29 directly. I read from this forum that you have to get econometer and tachometer wired to the ECU, which I have done, but there is no clear write-up regarding vehicle speed input from cluster to the ECU. I have reviewed ETM for 87, 88, and 89. For 88/89 325i, C2 Pin#10 (89' ETM 1360-8) goes to the C101 chassis side and then from C101 pin#14 to ECU pin#29. Does that mean I need to add a new wire at C2 pin#10 and bring it to the fuse box and then to the C101 Chassis side?


2) C101 pin#15 (unloader relay) - Do I need to bring the C1 pin#1 (blug plug) wire from the cluster to the C101 chassis side? Is this critical? 325e C101 chassis side pin#15 is not used so there is no signal currently going to the ECU.

Thank you for your time.






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[ForcedFirebird]

Hi, I'm hoping someone can help me with the below C101 pin#14 and pin#15 questions. I just finished replacing 87' 325e auto with 88' 325i manual and Motronic 1.3. The car came with 89' 325i cluster. So far, I finished connecting two wires (econometer and tachometer) from C104 connector to the 88 325i ECU (Motronic 1.3), disconnected pin#20 at C101, and wired the auto to manual reverse.

1) C101 pin#14 (speed signal out to ECU) - How do I wire the vehicle speed input from the cluster to the ECU? My car, although it has an 89' 325i cluster, there is no wire coming out of C2 pin#10(white plug) and to the C101 chassis side pin#14. Because of the 325e chassis, C101 chassis side pin#14 is not used so no signal going to the ECU. Currently, the vehicle speed output wire (C3 pin#26, BR/RD) from the cluster goes to the OBC/multifunction clock. I am wondering if I can simply splice C3 pin#26 wire from the cluster to the ECU pin#29 directly. I read from this forum that you have to get econometer and tachometer wired to the ECU, which I have done, but there is no clear write-up regarding vehicle speed input from cluster to the ECU. I have reviewed ETM for 87, 88, and 89. For 88/89 325i, C2 Pin#10 (89' ETM 1360-8) goes to the C101 chassis side and then from C101 pin#14 to ECU pin#29. Does that mean I need to add a new wire at C2 pin#10 and bring it to the fuse box and then to the C101 Chassis side?


2) C101 pin#15 (unloader relay) - Do I need to bring the C1 pin#1 (blug plug) wire from the cluster to the C101 chassis side? Is this critical? 325e C101 chassis side pin#15 is not used so there is no signal currently going to the ECU.

Thank you for your time.






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I feel you are over-complicating things. If you have a round plug on your car and round plug on your harness, the only wires you need to worry about are the c104 and pin 20 in c101. Everything else is plug and play.
Here's a block diagrams:

http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf

http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf

[herschelcv]

Hi ForcedFirebird, thank you for your reply. I just wanted a second opinion before I button up my dashboard. Thank you!