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Error Code 12231

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  1. The check engine light is off. There is no RPM signal. This code will always be present if the test is run with the engine off. Crank engine for 5 seconds. If code disappears, the RPM signal is OK. If code does not disappear, go to step 2.
  2. Check fuse no. 3. Check the ignition system input at pin 1 of the LH control unit.
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