Using the following test procedure I had a 12V test light on the injector harness of 1 injector it did not flash, maybe a small pulsation but the light was constant on, maybe the computer is sending fuel to all injectors all time? Still waiting on as pressure tester. And this is a returnless system.
Unplug the injector electrical connector.
Using an ohmmeter, test the injector resistance across the injector terminals. The reading should be approximately 12 ohms at 68°F (20°C).
If the resistance falls outside specifications, replace the faulty injector.
If the resistance is within specifications, proceed with the testing.
Place a 12 volt test lamp across the injector's electrical connector terminals. Watch the test lamp while cranking the engine and compare with the following:
If the test lamp does not flash, check the power feed and ground circuits between the PCM and the injector connector. Refer to the wiring diagrams in Chassis Electrical for wire colors. If the circuits are faulty, repair them. If the circuits are OK, test the engine control system using the Chrysler DRB, or equivalent scan tool.
If the test lamp flashes, proceed with the testing.
Check for fuel delivery at the suspect injector by removing the injector from the fuel rail and check for fuel and/or restrictions in the rail or injector fuel inlet. Compare your results with the following:
If there is no fuel present at the injector, replace the plugged injector, or clean the restricted passage, as necessary.
If there is fuel present at the injector, proceed with the testing.
With the injector removed from the fuel rail, connect a 12 volt source to one terminal on the injector connector and a ground wire to the other terminal. The injector should click each time the ground wire is connected and disconnected to and from the terminal.
If the injector clicks, it is OK. If it does not click, it must be replaced.
Sunday, March 18th, 2007 AT 11:15 AM