PLATE 4F3286 - Caterpillar

Illustration 2 g03367726
Right-hand side
Illustration 3 g03318080
Color schematic legend
Illustration 4 g02747936
P2 terminals that are associated with the injector solenoids (P2-116) Injector cylinder #1 return (P2-104) Injector cylinder #1 power (P2-111) Injector cylinder #2 return (P2-77) Injector cylinder #2 power (P2-106) Injector cylinder #3 return (P2-115) Injector cylinder #3 power (P2-42) Injector cylinder #4 return (P2-61) Injector cylinder #4 power (P2-50) Injector cylinder #5 return (P2-68) Injector cylinder #5 power (P2-88) Injector cylinder #6 return (P2-109) Injector cylinder #6 power (P2-31) Injector cylinder #7 return (P2-67) Injector cylinder #7 power (P2-75) Injector cylinder #8 return (P2-120) Injector cylinder #8 power (P2-18) Injector cylinder #9 return (P2-67) Injector cylinder #9 power (P2-87) Injector cylinder #10 return (P2-120) Injector cylinder #10 power (P2-22) Injector cylinder #11 return (P2-68) Injector cylinder #11 power (P2-98) Injector cylinder #12 return (P2-109) Injector cylinder #12 power (P2-108) Injector cylinder #13 return (P2-115) Injector cylinder #13 power (P2-103) Injector cylinder #14 return (P2-61) Injector cylinder #14 power (P2-118) Injector cylinder #15 return (P2-104) Injector cylinder #15 power (P2-113) Injector cylinder #16 return (P2-77) Injector cylinder #16 power
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.
A strong electrical shock hazard is present if the keyswitch is not turned off.
B. Disconnect the harness connectors for the affected cylinder at the cylinder head.
C. Fabricate a jumper wire that is long enough to create a test circuit across the harness connector at the cylinder head. Crimp connector pins to each end of the jumper wire.
D. Connect the jumper wire between terminal locations 1 (supply) and 2 (return). This test will effectively create a short circuit for the cylinder.
E. Restore the electrical power to the ECM.
F. Perform the