General Category > Engine related issues
Motronic 2.4, 2004 R1100S comms trouble
schuppi:
--- Quote from: HECOJohn on December 31, 2013, 06:21:27 PM ---Aloha,
Correction, Autoscan show no communication with controller.
--- End quote ---
Hi John
did you ever controlled the motronic relay and the incoming cables , connectors. maybe the ECU is not under any voltage?
Just a wiring diagram will help you.
HECOJohn:
Aloha,
The GS911 is reporting incorrect VBAT OR it takes voltage from a different source than shown on the diagram. Termination 6 on the Diagnostic Plug shows battery voltage using a volt meter. GS911 still showing ~5 volts. It does change slightly between key on and key off 9 (most likely headlight dropping battery voltage), never the less, it's not what the volt meter is showing. When I jump the fuel pump relay to power up the ignition circuit, I get correct reporting from the GS911 on VIGN.
I've narrowed it down to the fuel relay control circuit. The ECU is not grounding the fuel pump relay coil. Jumping the fuel pump side fires up the ignition and GS911 reports battery voltage at VIGN, so, that part works nominally. Now, getting the relay coil to pull in. The relay works when swapped with the Motronic relay. All grounds checked okay for continuity to the ECU plug. Don't know what's going on inside the ECU.
Question:
1. Does the GS 911 get VBAT from terminal 6 on the diagnostic plug?
2. My ECU got very warm (~100+ degrees F) within a minute or two of powering up the bike. The heat was from the upper right hand corner viewing it from the side marked MOTRONIC.
Still working on it. Game on now. Will report when I find something.
John
schuppi:
Hello
1. Does the GS 911 get VBAT from terminal 6 on the diagnostic plug? YES, so it is. Down from fuse F5, with a connector in the cable
harness.
Try to connect a new cable to the motronic relay.
2. My ECU got very warm. That are 38° C, think that is ok.
HECOJohn:
Thanks Shuppi,
I'm glad to hear that heat is not a particular issue however after further testing, the temperature went up to where I can't touch it. Whew!
F5? It's F4 on my drawing and testing proves that out. Anyway, I get battery voltage with my tester on ter;minal 6 on the diagnostic port. VBAT on the GS911 returns 5 or so volts. Still 0 VIGN. Autoscan is still a no comms with the ECU.
Without a diagram of the ECU, it's a painstaking process to try to map this circuit. There must be a short somewhere in the external wiring causing this but, without the diagram, it's a search and destroy mission.
I'll keep on it.
John
schuppi:
Hi John
Sorry, that was my fault. Just took a diagram from R1150.
But here it is. http://www.s-boxer.de/vbglossar.php?do=showentry&id=56
please look for the cable connector down under fuse F4, marked with 30A4. Maybe you have to disconnect all the red/yellow cables and install new cables for the relays, ECU and diagnostic plug.
Good luck
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