NO Start issue after Engine swap, HELP!

[Meir]

the security system consists of 3 parts that needs to match each other.
the emobilizer. located next to the ignition switch.
the alarm system located under the driver seat.
and the ECU located in the trunk.
all 3 of them need to talk with each other. if you replaced the ECU, you need to program it to accept the other 2 units.
with that said, i do not think that an issue with the security system will cause the engine not to crank. i will let more experience forum member make their comments, but meanwhile start with the simple stuff.
override the clutch switch, just to take it out of the equeison.

[xr_guys]

Hi Meir,

Thanks for your quick response, I will override the clutch switch just to make sure.

Ohhh additional information, so after we found we have no crank start and thinking the new computer not talking to the existing system we went to install the old computer and the same behavior from the car, also no OBD2 communication, crap!

I’m still puzzle why my OBD2 not connecting, this is some what unexpected. I was hoping that port will provide me with the error code I can start addressing issues.

I need OBD2 get sorted out first.

Thanks,
XR

[xr_guys]

Hi JFP,

My key is currently battery dead, I’m not getting the flashing red light during the locking and unlocking.

I will buy a new key battery today and try it on my old ECU, I’m thinking I should be able to start my car using the old ECU. The car may not run right but it should start.

Thanks,
XR

[xr_guys]

New Key battery did not help, still flashing red light on my key.

[78F350]

Originally Posted by xr_guys

New Key battery did not help, still flashing red light on my key.

Just a note: The battery in the key has NOTHING to do with starting the car. The parts of the key that effect starting the car are the blade (to turn the lock for the ignition switch) and the transponder (to send the correct code to the immobilizer)
Here's a pic of the transponder:

That's the only thing needed inside the key to have the car start. No battery, or electronics.

[78F350]

Originally Posted by xr_guys

...
we went to install the old computer and the same behavior from the car, also no OBD2 communication ...

Make sure that all of the original 2002 elements are in place: Key with transponder, immobilizer box, and DME (ECU).

Ground not correct? Big ground wire in the engine compartment. Bundle of brown wires in the trunk by the DME (ECU), brown wire that bolts to the floor by the immobilizer box under the seat.

Is the starter known good?

Is there more to the story? Could the car crank before you started on the engine swap...?