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Re: My 1990 900 turbo needs a new computer
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Posted by 85spgwt [Email] (#669) [Profile/Gallery] (more from 85spgwt) on Sun, 2 May 2021 04:35:49 Share Post by Email
In Reply to: My 1990 900 turbo needs a new computer, AzSaabguy [Profile/Gallery] , Wed, 28 Apr 2021 14:35:55
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According to the Bentley you can pull fault codes using a home made jumper wire and a switch.
"•As a general rule, a steady-on Check Engine light means the
LH control unit has detected a fault. A flashing Check Engine
light means that the EZK Ignition system has detected a fault.
As an exception to the rule, the check engine light on 1992
models does not flash. Therefore, a steady-on Check Engine
light on these models could be either an EZK system or an LH
system fault." (source is Bentley Manual pg. 151 Section 240-4) after this section it starts on how to use the switch and jumper wire, gives the test procedure and the fault codes.

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