u1000 class 2 serial communication problem

Use some CRC Electric Circuit Solvent NOT Brake Solvent or WD-40 to thoroughly spray out both the Male and Female sides of each and every Module and Sensor Connector. that some of the Harness Wires either got Cut or Stretched or the Connectors picked up some Oil and Dirt Contamination that is preventing the 0-5 Databus Signaling from getting through. It is entirely possibly that if there was any haste involved to get this job done quickly just after struggling with the Donor Engine Installation. and COMPLETELY REMOVE AND REPLACE EACH CONNECTOR. Start by systematically re-visiting each and every Harness Connector. Because you have only recently performed this Engine Swap. you'll have to locate the Break or Short and affect repairs. If the normal 0-7 Volts DC used by the Databus has been shorted either to Ground or to 12 Volts DC Power. The U1000 is a serious problem because All Databus Communications become affected. We get the following 4 codes during crank:Ģ) U1000 XFER $1A, Class 2 Data Link MalfunctionĤ) P0335 ENG $10, Crankshaft Position Sensor A Circuit Malfunction INTERMITTENT We transferred the oil pan, valve cover and accessories from the original block to the new one. I haven't researched where these sensors would be to even know if they are installed. In fact, I'm only assuming the engine rebuild included the crank, cam and/or other sensors. We are brand new to working on computer controlled cars so the most basic things we might know should not be assumed. My main question is if I need to do something for the PCM to learn the various engine sensors, or some other initial process.

We cleared codes and with no battery, shorted the battery cables together for about 5 minutes to reset/bleed down electronics in PCM. Vehicle ran fine before engine replacement (rod through engine block). My son mostly, and I replaced the original engine with a freshly rebuilt one, same year (4.2) - assembled block and head only.

U1000 class 2 serial communication problem