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Injector Solenoid Circuit - Test. Use this procedure for the following conditions. Inspect the Electrical Connectors and the Wiring, страница 3

  1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with injector solenoids.
  1. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
  1. Check the harness and the wiring for abrasion and for pinch points from each P300 connector to the ECM.

Expected Result:

All connectors, pins, and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion, or of pinch points.

Results:

  • OK - The harnesses and the wiring appear to be OK. Proceed to Test Step 2.
  • Not OK - There is a problem in the connectors and/or wiring.

Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.

STOP

Test Step 2. Check for Logged Diagnostic Codes for the Injector Solenoids

  1. Connect Cat ET to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
  1. Restore the electrical power to the ECM.
  1. Check Cat ET for logged diagnostic codes related to the injector solenoids.

Expected Result:

There are no logged diagnostic codes for the injector solenoids .

Results:

  • OK - No diagnostic codes for the injector solenoids are logged. The injector solenoids are operating correctly. There may be a mechanical problem with the injector's fuel delivery. Proceed to Test Step 3.
  • Not OK - A diagnostic code is logged for one or more injector solenoid. There is an electrical problem with an injector solenoid or with the circuit. Proceed to Test Step 4.

Test Step 3. Perform the "Cylinder Cutout Test"

  1. Start the engine.
  1. Allow the engine to warm up to normal operating temperature 77 °C (171 °F).
  1. Access the "Cylinder Cutout Test" by accessing the following display screens:
    • "Diagnostics"
    • "Diagnostic Tests"
    • "Cylinder Cutout Test"
  1. Shut off all parasitic loads such as air compressors which could affect the results of the test.
  1. Follow the instructions that are given on the screen.
  1. To start the test, select the start button at the bottom of the screen.
  1. Use Cat ET to manually cut out the cylinders in order to identify injectors that may have a performance problem. Highlight a cylinder and select the "Change" button at the bottom of the screen. The injector for that cylinder will be disabled. Check for a difference in the sound, feel, or power of the engine. Also, look for a change to the operating parameters that are displayed on the "Cylinder Cutout Test" screen.

Expected Result:

The cylinder cutout test indicates that all of the injectors are operating correctly.

Results:

  • OK - The cylinder cutout test indicates that all of the injectors are operating correctly.

Repair: If a problem with the fuel system is suspected and diagnostic codes are not active or logged, refer to Systems Operation/Testing and Adjusting for information that is related to the low pressure fuel system.

STOP

  • Not OK - The cylinder cutout test indicates that at least one of the injectors is not operating correctly. Proceed to Test Step 4.
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