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95 Civic EX check engine light on Code 9

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  #11  
Old 08-26-2009, 04:23 AM
mk378's Avatar
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Check that the sensor wires are not shorted to ground or to any other wiring (measure at the ECU plug with the ECU unplugged but the distributor plugged in). I think they run on shielded cable through the harness. Make sure the shield ground wire is intact.
 
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  #12  
Old 08-26-2009, 07:54 AM
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Originally Posted by mk378
Check that the sensor wires are not shorted to ground or to any other wiring (measure at the ECU plug with the ECU unplugged but the distributor plugged in). I think they run on shielded cable through the harness. Make sure the shield ground wire is intact.
OP -- This is done by measuring resistance (Ohms) to ground from either B11 or B12 in the ECU connector. There should be extremely high resistance.
 
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