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model year? (SBEC or NGC)
You should put that info in your signature, so no one has to search your other posts for what kind of van you have
Assuming this is on 2002, Check the voltage on PCM Connector 1 (black) pin 37 (DB/LG) - start with unplugged sensor.
If you find low voltage, shut the van off and pull the pcm connector off - check resistance between this wire (sensor supply) and ground (it should be infinitely high = open circuit with sensor unplugged)
If everything is good in the wiring and pcm output is low, the problem is internal to pcm
Last edited by atoman; 01-06-2013 at 12:27 PM.
relevant vehicle: '05 -=C=- T&C Ltd @~135K