HEAD GP-CYL -UTN 20R2645 - Caterpillar

Use this procedure to troubleshoot the engine electrical system if a problem is suspected with the injectors. Also, use this procedure if any of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
1-5 Cylinder #1 Injector : Current Below Normal The ECM detects a low current in the circuit for the injector solenoid. The code is logged.
The ECM continues the attempt to energize the solenoid circuit until the circuit is repaired.
2-5 Cylinder #2 Injector : Current Below Normal
3-5 Cylinder #3 Injector : Current Below Normal
4-5 Cylinder #4 Injector : Current Below Normal
5-5 Cylinder #5 Injector : Current Below Normal
6-5 Cylinder #6 Injector : Current Below Normal
7-5 Cylinder #7 Injector : Current Below Normal
8-5 Cylinder #8 Injector : Current Below Normal
9-5 Cylinder #9 Injector : Current Below Normal
10-5 Cylinder #10 Injector : Current Below Normal
11-5 Cylinder #11 Injector : Current Below Normal
12-5 Cylinder #12 Injector : Current Below Normal
13-5 Cylinder #13 Injector : Current Below Normal
14-5 Cylinder #14 Injector : Current Below Normal
15-5 Cylinder #15 Injector : Current Below Normal
16-5 Cylinder #16 Injector : Current Below Normal
1-6 Cylinder #1 Injector : Current Above Normal The ECM detects a high current in the circuit for the injector solenoid. The code is logged.
The ECM disables this solenoid circuit. The ECM will periodically attempt to energize the solenoid circuit until the circuit is repaired.
2-6 Cylinder #2 Injector : Current Above Normal
3-6 Cylinder #3 Injector : Current Above Normal
4-6 Cylinder #4 Injector : Current Above Normal
5-6 Cylinder #5 Injector : Current Above Normal
6-6 Cylinder #6 Injector : Current Above Normal
7-6 Cylinder #7 Injector : Current Above Normal
8-6 Cylinder #8 Injector : Current Above Normal
9-6 Cylinder #9 Injector : Current Above Normal
10-6 Cylinder #10 Injector : Current Above Normal
11-6Cylinder #11 Injector : Current Above Normal
12-6 Cylinder #12 Injector : Current Above Normal
13-6 Cylinder #13 Injector : Current Above Normal
14-6 Cylinder #14 Injector : Current Above Normal
15-6 Cylinder #15 Injector : Current Above Normal
16-6 Cylinder #16 Injector : Current Above Normal Background InformationPerform this procedure during operating conditions that are identical to the operating 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). The wiring and/or the connectors may have problems that only occur during vibration.These engines have fuel injectors that are electronically controlled. A solenoid is used to actuate the injector. The solenoid is mounted on top of the fuel injector body. The ECM sends a 105 V pulse to the injector solenoid. The pulse is sent at the proper time and for the correct duration for any given engine load and speed.Trim Files When an injector is replaced, program the new injector code into the ECM.