Did you try to relearn the keys?

 

No I have not tried / how do i do that ? - Any help greatly appreciated

 

Verify that you have good voltage. P1604 can indicate low voltage.
Monitor bat voltage when cranking should stay above 10.5v.

 

Yes i have a charger connected to it and its over 11.8V

 

Ok,when battery charge up check voltage when cranking.

 

You need tech stream to program a key.

https://www.toyotanation.com/threads/transponder-key-programming.1640366/?post_id=13901260#post-13901260

 

Thank you
I have a very old techstream software and the VCS(sp?) cable - i prefer not to toy with that as i dont want to brick or change anything - i rather pay a key mobile key guy to comeover and handle it.
I did not replace any keys nor the main ecu/immobilizer. Only replaced the ring antenna by the key hole - does this warrant a key programming ???
Thanks in advance

 

Not sure if a reprogram will work.
If you have the software and are careful what you do it will not cost you anything to try.
If it does not, you do not have other suggestions besides bringing it into a dealer or locksmith.

Did you try a different key?

Do you have an aftermarket alarm or remote start installed?

 

i tried both keys with fob and the valet key
no alarm system / no remote start.

 

Goixiz-does it start using starting fluid?
If so then fuel related problem.
Verify fuel pump energized when cranking.

 

i will try adding some a drops of gasoline in cylinder and see if it cranks
If it does then i would look for fuel related issue - how do i check fuel pump energized - no check engine light / codes

 

Best spray stating fluid( maybe brake clean would do) into intake.
No codes available specifically for fuel pump not being energized.
Need to measure for voltage at the appropriate test point.
ALLdata or Mitchell have wiring diagrams/voltage specs.

In addition verify that you have RPM( around 200) on scan tool when cranking.
This indicated the crank sensor signal getting to ECM.
Crank signal allows ECM to power up fuel pump thru circuit relays.

 

Crank with no start the tachometer does go to about 200-400