FOAM 4784207 - Caterpillar

Illustration 3 g03317985
Terminal locations of the injector solenoids at the P2/J2 connector.
(P2-1) Injector 1 supply
(P2-2) Injector 1 return
(P2-3) Injector 2 supply
(P2-4) Injector 2 return
(P2-14) Injector 5 supply
(P2-15) Injector 5 return
(P2-16) Injector 6 supply
(P2-17) Injector 6 return
(P2-24) Injector 9 supply
(P2-25) Injector 9 return
(P2-34) Injector 10 supply
(P2-35) Injector 10 return
(P2-40) Injector 3 supply
(P2-41) Injector 3 return
(P2-42) Injector 4 supply
(P2-43) Injector 4 return
(P2-48) Injector 7 supply
(P2-49) Injector 7 return
(P2-50) Injector 8 supply
(P2-51) Injector 8 return
(P2-52) Injector 12 supply
(P2-58) Injector 11 supply
(P2-59) Injector 11 return
(P2-62) Injector 12 return
Electrical Shock Hazard. The unit injector system uses 90 - 120 volts. The ECM sends this signal to the unit injectors. Do not come in contact with the unit injector harness connector while the engine is operating. Failure to follow this instruction could resulting in personal injury or death.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Logged Codes or Active Codes
A. Establish communication between Cat ET and the engine ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine if the -5 or -6 code is active or logged.
Codes
Results: A -5 code or a -6 code is logged or active.
Proceed to Test Step 3.
Result: A code is not logged or active.
Proceed to Test Step 2.
2. Perform the "Cylinder Cutout Test"
A. Start the engine. Allow the engine to warm up to normal operating temperature .
B. Perform the "Cylinder Cutout Test". Check for a noticeable change in fuel usage.
Fuel usage
Results: There is a noticeable change in fuel usage. The injectors are firing on all cylinders at this time.
Proceed to Test Step 3.
Results: There is not a noticeable change in fuel usage.
Verify that the valve lash for the suspect cylinder is OK then replace the suspect injector.
Verify that the repair eliminated the problem.
3. Check the Harness between the ECM and the Injector Connectors for an Open Circuit
A. A. Turn the main disconnect switch to the OFF position.