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Old 01-18-2003, 05:22 PM
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Error code on Federal '88 300E

Today my Check Engine light came on twice. When I got home this afternoon, I turned on the ignition without the engine running and read 30% at pin 3. After starting the engine it gave a nice 49%.

A year or two ago MBDoc was kind enough to send me a sheet of paper with the trouble codes. I can't find that sheet of paper anywhere now. It seems like I remember that 30% meant that all was well.

If 30% is a trouble code and someone has the information to tell me what it indicates I would appreciate the help.

Thanks in advance,
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Old 01-20-2003, 10:10 PM
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The Check Engine light only comes on when engine started when warm.

Thanks for any help you can offer about error code question above.

Have a great day,
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Old 01-21-2003, 11:09 AM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
30% Duty cycle code is :

1- Fault ECT
2- Open/short between ECU/ECT

As it happen when warm, I would try an ECT or Check the connector/sensor w/ohm meter...
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