Seems like your on the right track. This is what I found. (Sorry 'bout the cut & paste)
p1202
Description :
Oil tank pressure switch implausible or blow-by valve still closed.
Possible cause:
Damaged oil pressure switch, blow-by valve failure, damaged circuit wires, damaged connector or damaged ecm pins.
Service Action:
Check for 1.27 to 2.47 ohms between terminals.
Check if TOPS is connected to wiring harness.
Check resistance at 0 RPM and above 3500 RPM. At high RPM the resistance should be clost to 0 ohm.
Check for 12 volts on pin 1 of blow-by valve.
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