Engine can`t start,no power supply to injector relay

There is no relay for the injectors. Fuses 54 & 55 in the IDPM supply power to the injectors with the ignition switch in the on or start position, the ECM - engine computer turns them on by supplying a ground in a pulse width modulation .

SYSTEM DESCRIPTION The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engine operating conditions. These conditions are determined by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air flow sensor.

Definition of Fuel Injector Pulse Width (liveabout.com)

No power to the fuel injectors can be caused by a few things. If the relays, fuses, and computer all check out then I would move on to looking at the engine management and fuel system. ... A no start condition can also be caused by a faulty fuel pump, or any of the associated components.
The injector fuse and relay are usually located in the relay box or power distribution center in the engine compartment. Fuses are used to protect various electrical circuits while supplying power to components. They help the fuel pump, fuel injection and computer systems from suffering a short circuit

A factory or a professional scan tool would be a great help in diagnosing this problem ! The PCM - engine computer supplies a ground to the injectors if all the right inputs to the PCM are there ! Crankshaft position & Camshaft position sensors being the most important . Plus if there was an anti-theft system problem , in most vehicles ,the injectors would be disabled ! Does the check engine light come on when you turn the key on , not to start , just on ? Does your vehicle have a Tachometer ? When cranking the engine does the tachometer move ? Also is there spark ? Did you pull a plug wire an hold near metal on the engine while someone else cranked the engine ? Check for power an grounds at the PCM , no power , check the ASD relay ! The ASD relay powers up the vehicle an they do go bad ! short inside or open circuit etc...

hi job one check the fuse or relay if this is not the problem let me no

Maybe this will help ---

Also check the fuel shut off switch since you do not have power.

If the passkey system were not working the engine should not crank and the fuel injectors would be dead. The security light would also stay on.
The fuel pump relay gets battery voltage and also voltage from the key switch. The computer grounds the relay to power the pump.
The crank sensor does not come into play until the engine is cranking and it supplies a signal for the ignition and injector pulse.
Are you not getting power from the key switch to the relay, or from the battery side to the relay ?

check for injection pulses at the injectors.
Each injector has two wires, one is a supply (12Volt) and the other is grounded by the engine management unit. The switching is very fast so you would not detect it with a test light. Try a multimeter set to frequency. If you check the supply to the injectors, disconnect ALL of them at once. You should have power to only one wire at each injector plug. If no power is present, check the fuel system relays and fuses.

The power supplied to the fuel pump, ignition coil, fuel injectors, and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.

The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, or if the turbo boost pressure reaches and exceeds the over boost cut-off point, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module. This causes the engine to shut down.

Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start.

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If you are getting spark and the engine tries to run on starter fluid, then you have lost fuel. Check that you are getting injection pulses at the injectors and check the fuel pressure at the fuel rail at the injectors. Check for power to the fuel pump when the engine is cranking, If you get no power to the fuel pump when cranking the engine, check fuses and relays. If the pump is running but you have no fuel pressure, check the fuel filter and fuel pressure regulator and replace any that are faulty. If the injection pulses are missing, check the supply relay which supplies power to the injectors first ( the injectors are earthed by the ECU) Disconnect one of the injector plugs and using a test light (buy one from a auto parts store) clip the end to a good earth on the vehicle body, switch the ignition on but dont start the engine, then probe the two connections in the injector plug. One of these connections should be active all the time with the ignition switched on. If it is, you may have a sensor failure (crank sensor etc), if it is not, check fuses and supply relays. A word of warning, the wiring you are dealing with is connected directly to the engine control, if you make a mistake, you can cause irreparable damage so if you have any doubts, take the vehicle to a professional..

It sounds like an air lock or a fuel pump issue. firstly get the filter changed and bled through this might help. if the problem persists check the pump.

Regards

Dan