P1603 is a communication fault between the ECM and TCM and the most common cause is a blown fuse or bad wiring connections. Worst case scenario is a faulty Control Unit.
You mentioned the MIL indicating for a 2 seconds and engine will fire after which it would cut off. Did you test the fuel injector wire connector for battery voltage at one of the wires. Sorry I do not have the wiring color nor pin location to be sure which is the exact one. When engine stalled or could not be started, there must be battery voltage. The other is for the Engine Control Unit to ground the circuit to operate the injector.
Possible causes for this are :
1. Faulty relay, engine control and/or fuel pump
2. Faulty Engine Control Unit.
3. Fault with Immobilizer ( if equipped)
4. A bad ignition switch.
5. Bad ground or wiring connections.
6. A bad camshaft sensor.
Check all ground connections. Disconnect the ECM and check for clean and tight connections. Are there any more trouble codes present? Check the live data of the crank and cam sensors to see if they are working.
Sunday, November 5th, 2017 AT 10:41 PM