Hello .. I have a 96 olds acheiva sl 2.4 and some time you will go to
start and it will do a bulb check and start and others there will be no
bulb check and it will not start. I have checked the ignition b+ and
12volt constant to the cluster and it is always there, check serial
data voltage from pcm and always there. The only codes were history
codes of P1601 and P1629.
When the car starts it runs fine, no theft light, no check engine
light. The dealer has replaced the ignition switch twice and no one can
figure this out.
I do not see the existence of a P1629 code, did you miss type? The only one
in the 1600s is P1601, which should give them a good place to start. The
P1601 sets when the PCM does not receive 25 valid responses from the
Anyway, if it's intermittent and there is no precedent, it'll be hard to
find the cause. You could check the connectors and grounds to the cluster
and the PCM, but I'm sure the dealer did this.
Hey steve... a P1629 is Theft Deterrent Fuel Enable Signal Not Received
(Passkey Frequency Invalid)
However they were both history codes. So far it has started every time
today and no problems.. all the wiring looks to be good and i checked
the cluster grounds and they were good. What do you mean by no
precedent? The only starge thing i found was someone hacked in a power
lock module which i removed and repaired the three wires it was
contacting. I tryed to test for voltage from the pass lock at the
cluster connector and there was no reference and no voltage but the
cluster was unplugged.
Thanks for your help..
ALLData makes no mention of it, I'll make a mental note of that.
Hrm, someone hacked the wiring eh? That sounds like a good lead. How long
ago was this repaired? Was the repair done 'professionally?' (soldered and
sealed) Was there any evidence under/behind the dash of other things that
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