SEAL AS 1140710 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect faults with the injector solenoids.Use this procedure for the following diagnostic codes:
0001-05 Cylinder #1 Injector current below normal
0001-06 Cylinder #1 Injector current above normal
0002-05 Cylinder #2 Injector current below normal
0002-06 Cylinder #2 Injector current above normal
0003-05 Cylinder #3 Injector current below normal
0003-06 Cylinder #3 Injector current above normal
0004-05 Cylinder #4 Injector current below normal
0004-06 Cylinder #4 Injector current above normal
0005-05 Cylinder #5 Injector current below normal (C6.6 engine only)
0005-06 Cylinder #5 Injector current above normal (C6.6 engine only)
0006-05 Cylinder #6 Injector current below normal (C6.6 engine only)
0006-06 Cylinder #6 Injector current above normal (C6.6 engine only)Perform this procedure under conditions that are identical to the conditions that exist when the fault occurs. Typically, faults 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 pulse to each injector solenoid. The pulse is sent at the correct time and at the correct duration for a given engine load and speed. The solenoid is mounted on top of the fuel injector body.If an open circuit is detected in the solenoid circuit, a diagnostic code is generated. The ECM continues to try to fire the injector. If a short circuit 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 fault is corrected."Injector Solenoid Test"Use the "Injector Solenoid Test" in the electronic service tool 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. The electronic service tool will indicate the status of the solenoid as "OK", "Open", or "Short".
Illustration 1 g01336666
Typical example of the fuel injector
Illustration 2 g01805273
Schematic of the circuit for the injector solenoids in the C4.4 engine
Illustration 3 g01805296
View of the pin locations on the P2 connector for the injector solenoids in the C4.4 engine
(57) Injector Cylinder (No. 1)
(35) Injector (No. 1 Cylinder Return)
(63) Injector Cylinder (No. 2)
(7) Injector (No. 2 Cylinder Return)
(64) Injector Cylinder (No. 3)
(8) Injector (No. 3 Cylinder Return)
(58) Injector Cylinder (No. 4)
(34) Injector (No. 4 Cylinder Return)
Illustration 4 g01805313
Schematic of the circuit for the injector solenoids in the C6.6 engine
Illustration 5 g01171366
View of the pin locations on the P2 connector for the injector solenoids in the C6.6 engine
(57) Injector Cylinder (No. 1)
(35) Injector (No. 1 Cylinder Return)
(58) Injector Cylinder (No. 2)
(34) Injector (No. 2 Cylinder Return)
(59) Injector Cylinder (No. 3)
(33) Injector (No. 3 Cylinder Return)
(64) Injector Cylinder (No. 4)
(8) Injector (No. 4 Cylinder Return)
(63) Injector Cylinder (No. 5)
(7) Injector (No. 5 Cylinder Return)
(62) Injector Cylinder (No. 6)
(6) Injector (No. 6 Cylinder Return)
Illustration 6 g01237524
Typical example of the harness connector for the fuel injector
Illustration 7 g01237558
Typical example of the connector in the valve mechanism cover
Test Step