Question about 1998 Buick Century
Hello i have a 98 century 3.1 i am working on, the problem is the computer cannot activate the evap purge solenoid on the intake, it has constant power with the Key on to the solenoid, if i try to command the solenoid open with my scanner it will not activate and usually after 2 or three attempts the computer will time out and i have to reenter, i am Not getting the ecm ground to activate the solenoid if i apply a ground with my power probe to the green/white wire it will activate, The pink wire has 12volts key on and when i plug the sensor in i get 12volts over to the green/white wire is this normal? the green white wire has continuity back to the ecm and looks ok? i think i have a bad computer driver but i am not positive , i have already replaced the evap purge solenoid thinking it was stuck it seems i have some sort of ground issue on the green/white wire because if i measure across the plug with the solenoid unplugged my meter reads 11.5 volts? battery voltage is 12.5 but the solenoid will not open unless i ground the green/white wire manually? if someone can provide a diagram of this circuit that would be very helpful otherwise i am thinking i have a bad computer driver -jeff Jjust so you know i can control the VENT solenoid with my scanner so i know that works ok
You ever fix this? think you have a bad pcm also
Posted on Sep 05, 2008
The computer in a buick is vary difficalt to figure out i would recomand on taking it in to the nearist GMC Pontiac buick dealer near u so they can do it for u
Posted on Sep 04, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.
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