I'm going through the harness while waiting for DUDMD to return and provide a new DME. All of the grounds for each bank are grounded to the valve cover. Additionally they are connected to a small 1"x 1/2" black device and to a group of green wires. I have thoroughly reviewed the Bentley manual and can't find or identify the small device and connection. I assume it is a diode but I would like to be sure. I have no spark and I'm checking all of the wiring and grounds. Anyone know what this device is and it's function? It is located under the wiring compartments on the engine, one for each side.
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95 M3 LS swapped
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It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
The facelift loom (for the M62TUB) has GREEN wires to the coils which should be permanently at 12V when the ignition is switched ON - supplied by the unloader relay K6326 - that's the place to start. The DME grounds the other side of the coil primary through the BLACK/xxxx wires (BLACK/BLUE, BLACK/YELLOW etc).
The secondaries are grounded through BROWN wires - on the pre-facelift these were joined to a resistor before being grounded, again through a BROWN wire. There is no diode or resistor in the ignition coil wiring on the M62TUB harness
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
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KIMG0002.jpg
Here's a picture of the little bugger. It is grounded on one side and I guess the other side(green) is power. You can see the bundles of green and brown wires. I have checked the wires back to the DME and the grounds. Seeing this little device threw me off. If it failed open or shorted would it not cause the spark system to fail?
01' 750il Chromeline
95 M3 LS swapped
07 M5 Manual
06' M5, Spartan wheels and a 507hp V10
00' 740il Dinan, CAI, Romulus exhaust, Stage 5 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Sold
00' 323i wagon for daughter
03' 525i wagon for the wife, sold
98' 740i for the daughter, wrecked
92' 525i with over 200k, wrecked
02' R1200 CLC, hit by a bus and broken in half. That one made the news!
It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
Never seen that before but it has a BMW number on it. Doesn't pull up on realoem. Have you check the fuse carrier. Fuse 5 goes to the uniloader. If you haven't checked it before, it's the box next to the uniloader with 5 fuses in it.
K6326, X6326
rear RH side of engine compartment in E-Box
K6326 Unloader relay terminal 15 X6326 Component connector (9-pin, Black), Unloader relay terminal 15
Yup, all fuses pulled cleaned and tested. I looked on Realoem and only came up with a harness. Checking the harness wire by wire to cover all of the bases. I don't want to cut anything unless I have to. Then a simple test would confirm what type of device unless it's dead. My only guess is a high value resistor from power to ground. The DME may want to see a fixed current flow to confirm a good system. They do this in automation to tell the system when there is a broken wire.
01' 750il Chromeline
95 M3 LS swapped
07 M5 Manual
06' M5, Spartan wheels and a 507hp V10
00' 740il Dinan, CAI, Romulus exhaust, Stage 5 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Sold
00' 323i wagon for daughter
03' 525i wagon for the wife, sold
98' 740i for the daughter, wrecked
92' 525i with over 200k, wrecked
02' R1200 CLC, hit by a bus and broken in half. That one made the news!
It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
After a bit of research - the strange device is a capacitor which runs between 12V and Ground - as it is probably a ceramic device I would doubt if it has died.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
Of course, odd to see one on a DC system. Unless it was shorted there would be no physical connection. I would guess that BMW was just trying to hold peak voltage. It makes sense that they got rid of it. If I keep having problems with spark I may test them.
01' 750il Chromeline
95 M3 LS swapped
07 M5 Manual
06' M5, Spartan wheels and a 507hp V10
00' 740il Dinan, CAI, Romulus exhaust, Stage 5 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Sold
00' 323i wagon for daughter
03' 525i wagon for the wife, sold
98' 740i for the daughter, wrecked
92' 525i with over 200k, wrecked
02' R1200 CLC, hit by a bus and broken in half. That one made the news!
It's like herpes there is no cure but if treated properly you can live with it for the rest of your life
More likely it is there to reduce radio-frequency interference
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
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