So, I've been troubleshooting a no start/no crank issue all this weekend on my manual 1987 325i and I'm stumped. The last thing I can think to check is the ECU. Anyone in the Portland area got a known good Motronic 1.3 ECU I could borrow? I live in Aloha, so the closer the better.
The car currently has a Bosch 0 261 200 525, but I understand any 1.3 will work, is this correct?
I've read novels worth of forum post looking for things to test, but as I said, I've run out of ideas. In case anyone has any pointers I'll throw up a list of everything I've tested:
Also, every electronic in the car appears to function properly when the key is in the ON position: windows, radio, lights, etc. There is not dimming of the lights when I turn the ignition to the START position.
One question about the Ignition Switch test that I've been unable to get an answer to, is... When I performed the "Start only" test between C1 & C there was continuity when I first begin turning the key, but once I reach the full START position there is no longer continuity. Is this how it normally functions or should it maintain continuity? I've been looking at my cars wiring diagram and I can't figure out what C1 and C are for. The wires are BROWN and BROWN w/ LIGHT BLUE STRIPE.
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From Bentley Service Manual, pg. 520.
The car currently has a Bosch 0 261 200 525, but I understand any 1.3 will work, is this correct?
I've read novels worth of forum post looking for things to test, but as I said, I've run out of ideas. In case anyone has any pointers I'll throw up a list of everything I've tested:
- Battery
- Original Starter and known working starter (tested both starters out of the car and they both function properly.
- Ignition ON/START wire (12v)
- Ignition Switch - passed all continuity test (see comments below)
- Crankshaft Position Sensor
- Fuel Pump
- Relays
- Fuses
- ECU connector - passed all continuity and voltage test
- Ground Tests
Also, every electronic in the car appears to function properly when the key is in the ON position: windows, radio, lights, etc. There is not dimming of the lights when I turn the ignition to the START position.
One question about the Ignition Switch test that I've been unable to get an answer to, is... When I performed the "Start only" test between C1 & C there was continuity when I first begin turning the key, but once I reach the full START position there is no longer continuity. Is this how it normally functions or should it maintain continuity? I've been looking at my cars wiring diagram and I can't figure out what C1 and C are for. The wires are BROWN and BROWN w/ LIGHT BLUE STRIPE.
From Bentley Service Manual, pg. 520.
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