Honda Blackbird 02 Machine will not start it is not giving a fault code,I have checked all plugs and connectors for corrosion and cleaned all switches,and relays are OK.fuel systems seems to pressurize when trying to start.

code p 0603 refers to engine control module (ECM)--Kam error==causes --ECM
it also refers to system voltage ---malfunction===causes ---wiring,-- poor connections-- battery---alternator
before you race out to get an ECM unit have the following done
have a load test done on the battery
have an accredited auto electrician check out the alternator and regulator
check the drive belt for condition and tension
check the plugs connected to the ECM have no moisture or corrosion present
check the battery terminals and battery posts are shiny clean and tight
What the code is referring to is insufficient voltage to work the ECM properly then a possible ECM fault

normally is a faulty PCA, RAM memory, or eeprom faulty. Reset the machine, and if the problem persist adjust the REED switch, see the diagram, clean it, test for open or faulty, clean the connector and tight very well.
Open the display board, and clean the ribbon cable with pencil eraser the contacts from dirty and corrosion. You can use the contacts cleaner for the rest of connector, clean it very well from dirty, corrosion. and try it. see the diagram attached.
God bless you

Hi, Deon and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Improper valve clearance (too tight)
17. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
18. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
19. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
20. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
21. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
22. Faulty neutral, clutch, kickstand safety switch.
23. Faulty fuel pump or fuse or relay.
24. Faulty or corroded run/stop switch.
25. Tilt sensor needs a reset.
26. Security system not disarming alarm needs a reset.
27. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.cbrxx.com/threads/blackbird-wont-start.22820/
http://www.cbr1100xx.org/forums/index.php?/topic/88306-2002-xx-cranks-but-wont-start-correction-2001/
http://www.bikerchris.co.uk/bike_manuals/CBR1100XX_Service_Manual-97-98.pdf
https://www.partsfish.com/page/oem-parts-for-honda
https://www.manualslib.com/manual/677765/Honda-Cbr1100xx.html

Disconnect the alarm, give the battery a full charge and see if it manages to hold the charge. If not, measure the current flow through one of the battery terminals. Should only be one or two milliamps..!