Does it run? wow no symptoms, why make this so hard?????
did you read the FSM yet,, no.
did you see it free here.
P1391
loose of CMP/CKP
English, the cam or crank sensors are not firing right.
1 in 10 pulses will trip this (bad) or dead.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
SOURCE: 2001 Jeep Grand Cherokee showing code P0740
first I want you disconnect the battery and Change filters and good oil transmission .and let me know .
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