Question about 1995 Pontiac Bonneville

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1995 pontiac bonneville 3800 v6

Obd1 code reads po321 Ignition/Dist engine speed input CKT range/perf car dies sometimes but will start right back up what should we look for no other codes

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P0321 Spark Reference Circuit. The spark reference signal is used by the PCM to improve ignition timing accuracy during crank and at engine speeds of up to 1,200 RPM. The spark reference circuit allows the use of ignition control mode below 400 RPM, eliminating the need to utilize module mode during start-up, and also allows the PCM to calculate true crankshaft position in 1/6 the time that use of the fuel control reference signal would permit. During normal operation, the PCM uses the spark reference signal to control ignition timing until the engine speed exceeds 1200 RPM, at which time the fuel control reference signal is used. There is no connection to the TCS.
If everything checks ok then the PCM is defective PCM.

Posted on Aug 28, 2008

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