SPRING 5I7740 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect problems with the injector solenoids.Use this procedure for the following diagnostic codes:
1-05 Cylinder #1 Injector current low
1-06 Cylinder #1 Injector current high
2-05 Cylinder #2 Injector current low
2-06 Cylinder #2 Injector current high
3-05 Cylinder #3 Injector current low
3-06 Cylinder #3 Injector current high
4-05 Cylinder #4 Injector current low
4-06 Cylinder #4 Injector current high
5-05 Cylinder #5 Injector current low
5-06 Cylinder #5 Injector current high
6-05 Cylinder #6 Injector current low
6-06 Cylinder #6 Injector current high
You have been directed to this procedure from Troubleshooting, "Troubleshooting without a Diagnostic Code".Perform this procedure under conditions that are identical to the conditions that exist when the problem occurs. Typically, problems with the injector solenoid occur when the engine is warmed up and/or when the engine is under vibration (heavy loads).These engines have Electronic Unit Injectors (EUI) that are mechanically actuated and electronically controlled. The Engine Control Module (ECM) sends a 105 volt pulse to each injector solenoid. The pulse is sent at the proper time and at the correct duration for a given engine load and speed. The solenoid is mounted on top of the fuel injector body. The 105 volt pulse can be individually cut out to aid in troubleshooting misfire problems.If an open is detected in the solenoid circuit, a diagnostic code is generated. The ECM continues to try to fire the injector. If a short is detected, a diagnostic code is generated. The ECM will disable the solenoid circuit. The ECM will periodically try to fire the injector. If the short circuit remains this sequence of events will be repeated until the problem is corrected.The injector codes must be programmed into the ECM. Injector codes allow each individual injector to be fine tuned for optimum performance. The ECM will generate the following diagnostic code if the injector codes are not programmed:
253-02 Check Customer or System Parameters When an injector is replaced, program the injector code into the ECM. If the ECM is replaced, all six injector codes must be programmed into the new ECM. Refer to Troubleshooting, "Injector Code - Calibrate" for more information."Cylinder Cutout Test"Use the "Cylinder Cutout Test" on the Caterpillar Electronic Technician (ET) to diagnose a malfunctioning injector while the engine is running. All active diagnostic codes must be repaired before running the "Cylinder Cutout Test". When a good injector is cut out, the "Fuel Position" should change. The change in the fuel position is caused by the other injectors that are compensating for the cut out injector. If a malfunctioning injector is cut out, the "Fuel Position" will not change. The "Cylinder Cutout Test" is used to isolate the malfunctioning injector in order to avoid replacement of good injectors."Injector Solenoid Test"Use the "Injector Solenoid Test" on Cat ET to aid in diagnosing an open circuit or a short circuit diagnostic code while the engine is not running. The "Injector Solenoid Test" will send a signal to each solenoid. Cat ET will indicate the status of the solenoid as "OK",