Been reading for three days with no luck so I?ll ask. Me and my newbie tuner buddy trying to get the p59 ff sensor reading content. We are doing this on a bench not in the vehicle. Pinned blue 56 and have the sensor wired up with e70 test fuel running through it. I have two p59 ecm with same service and hardware numbers. 03 express van and a 03 L59 Tahoe. Credits bought for the van ecm but not for the L59 Tahoe. My question is should we be checking more of the swap boxes? We are only checking the fuel box. Please explain as simply as possible what needs checked before write entire. Also I want to keep the 4L80e. Thanks
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