Z3 Roadster (E36/7) No crank seems to be EWS issue - Bimmerfest - BMW Forums

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E36/7 Z3 (1996-2002)
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Old 01-01-2013, 06:44 PM
raywith76elsi raywith76elsi is offline
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Location: SC
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Mein Auto: Z3 Roadster
Question No crank seems to be EWS issue

Happy New Year to all. Have a 2000 Z3 with 6 cylinder and manual transmission. It has been running fine until one day when I drove it to work and was unable restart it again when it was time to go home. Had to have it towed back to the house so I could test a few things. Tried locking/unlocking, arming and disarming the alarm, tried multiple keys but nothing works. I can hear something running (fuel pump?) when the key is turned on but no cranking takes place. My diagnostic reader (Peak) indicates codes d0 (EWS Engine Speed) and 80 (EWS signal) from table 15. Only other clue that I remember was the DSC light coming on during my initial ride into work, it had not done this before. Clock, lights, and other electrical accessories seem to power on just fine. Original radio has been locked down for over a year, cannot seem to come up with a code that will work.
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Old 01-02-2013, 04:08 AM
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vintage42 vintage42 is offline
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Location: Louisville, KY
Join Date: Jun 2007
Posts: 3,760
Mein Auto: 1997 BMW Z3 1.9 5MT
One forum post says:
"The EWS controls the signal from the key to the injection system. If the key doesn't match the stored code in the EWS brain the car will not start."

EWS is apparently a German acronym for Electronic Immobilization System or Driveaway Protection System or antitheft system. The Bentley Manual says a primary code is imbedded in the key and the vehicle and a secondary code is changed every time the vehicle is started. If the key code and EWS module do not match, the engine management module and starter are disabled. And it is possible to damage the electronics in the key rendering it unusable.

Here's some stuff on EWS:

Last edited by vintage42; 01-02-2013 at 05:11 AM.
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Old 01-02-2013, 04:11 PM
marty505 marty505 is offline
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Location: New Mexico
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Mein Auto: 99 Z3 M Coupe/99 540i
I'd take a look at the starter immobilization switch near the top left side of the clutch pedal (there's also a switch on the right side of the pedal, it deactivates the cruise control).
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Old 02-24-2013, 06:01 PM
raywith76elsi raywith76elsi is offline
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Location: SC
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Code reader confirms that EWS is keeping the car from starting. Another code indicates there is a problem with engine speed signal. Is there some relation to another issue; the last time it ran, the DSC light came on. Car has been sitting and now the battery is dead, it will have to be put on a charger before more troubleshooting can be done. Has anyone experienced this type of lock down?
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Old 02-25-2013, 07:48 AM
dougmcintyre dougmcintyre is offline
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Location: Chapel Hill, NC
Join Date: Sep 2009
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Mein Auto: 2000 M Coupe, 1997 318ti
Despite the EWS codes, I would not automatically rule out a bad battery or corroded connections. I've read
1 - if the ECU detects a battery voltage that to low to start the engine, the ECU won't supply power to the starter.
2 - sometimes with low voltage, the car will throw false codes.

Also, I'm surprised after only two months of sitting, a formerly in-use "good" battery is now bad. Z3's don't have a lot of fancy, power draining electronics. Just sounds awfully coincidental.

Personally the only battery test I trust is to switch in a known good battery. Sounds like you have other cars. Perhaps you could make a temporary battery swap.

Last edited by dougmcintyre; 02-25-2013 at 07:58 AM.
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