LOCKWASHER 9B1117 - Caterpillar

System Operation Description:Use this procedure for any of the following diagnostic codes:
1-2 Cylinder #1 Injector erratic, intermittent, or incorrect
2-2 Cylinder #2 Injector erratic, intermittent, or incorrect
3-2 Cylinder #3 Injector erratic, intermittent, or incorrect
4-2 Cylinder #4 Injector erratic, intermittent, or incorrect
5-2 Cylinder #5 Injector erratic, intermittent, or incorrect
6-2 Cylinder #6 Injector erratic, intermittent, or incorrect The following background information is related to this procedure:The engine has electronic unit injectors that are controlled by the Electronic Control Module (ECM) for the engine. The ECM sends a pulse to each injector solenoid. The pulse is sent at the correct time and for the correct duration for a given engine load and engine speed. Use this procedure to identify the cause of the diagnostic code. Use this procedure to repair the system.If an injector is replaced, then the correct trim file for the new injector must be programmed into the ECM. The trim files for the injectors 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:
268-2 Programmed Parameter Fault erratic, intermittent, or incorrectRefer to Troubleshooting, "Injector Trim File" for further information.If the ECM is replaced then the replacement ECM must be correctly programmed. Refer to Troubleshooting, "Replacing the ECM" for further information.Use the electronic service tool in order to perform the "Fuel System Verification Test". The "Fuel System Verification Test" is used to check that the system operates correctly after a repair has been made.
Illustration 1 g01423833
Typical example of the electronic unit injectorTest Step 1. Check for Diagnostic Codes that are Related to this Procedure
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Check for logged diagnostic codes that are related to this procedure.
Make a note of the logged diagnostic codes.Expected Result:Expected Result 1One or more of the following diagnostic codes are logged:
1-2 Cylinder #1 Injector erratic, intermittent, or incorrect
2-2 Cylinder #2 Injector erratic, intermittent, or incorrect
3-2 Cylinder #3 Injector erratic, intermittent, or incorrect
4-2 Cylinder #4 Injector erratic, intermittent, or incorrect
5-2 Cylinder #5 Injector erratic, intermittent, or incorrect
6-2 Cylinder #6 Injector erratic, intermittent, or incorrect Expected Result 2Three injectors that share a common supply indicate a diagnostic code.Note: Injectors 1, 2 and 3 share a common injector driver circuit in the ECM. Injectors 4, 5 and 6 share a common driver circuit in the ECM. If three injectors that share a common supply indicate a diagnostic code then this is probably caused by a faulty ECM.Results:
OK - Result 1 One or more diagnostic codes are logged. Proceed to Test Step 2.
OK - Result 2 Three injectors that share a common supply indicate a diagnostic code. Proceed to Test Step 3.
Not OK - No related diagnostic codes are logged.
STOPTest Step 2. Check the Faulty Cylinder Numbers
Use the electronic service tool in order to make a note of the logged diagnostic codes.
Use the noted diagnostic codes in order to check the cylinders for faulty injectors.Expected Result:The diagnostic codes indicate the cylinder numbers that