COIL AS 3E8588 - Caterpillar

Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector, the J20/P20 primary engine speed/timing sensor connector, and the J44/P44 secondary engine speed/timing sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and pinch points from the engine speed/timing sensors to the ECM.Expected Result:All connectors, pins, and sockets should be completely inserted and coupled. The harness and wiring should be free of corrosion, abrasion, and pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit. Verify that the repair eliminates the problem. Stop.Test Step 2. Check for Diagnostic Codes
Connect the electronic service tool to the service tool connector.
Turn the keyswitch to the ON position.
Observe logged diagnostic codes on the electronic service tool.Expected Result:The electronic service tool should indicate one of the following diagnostic codes as being active or recently logged:
190-02 Loss of Engine RPM Signal
190-08 Engine Speed Signal abnormal
342-02 Loss of Backup Engine RPM Signal
342-08 Backup Engine Speed Signal abnormalResults:
OK - One of the above diagnostic codes is active or recently logged.Repair: If 190-02 Loss of Engine RPM Signal and/or 190-08 Engine Speed Signal abnormal is present, disconnect the secondary engine speed/timing sensor (bottom).If 342-02 Loss of Backup Engine RPM Signal and/or 342-08 Backup Engine Speed Signal abnormal is present, disconnect the primary engine speed/timing sensor (top). Proceed to Test Step 3.
Not OK - None of the above diagnostic codes is active or recently logged. Proceed to Test Step 3.Test Step 3. Check the Engine Speed/Timing Sensor
Turn the keyswitch to the OFF/RESET position.
The flange of the sensor should be flush against the engine in order to ensure proper operation.
Inspect the bracket in order to ensure that the installation allows the flange of the sensor to be flush against the engine.Verify that the bracket is not bent.Note: The bracket cannot be replaced separately.
Ensure that the O-ring has been installed on the sensor, and ensure that the O-ring is free of damage.Expected Result:The flange of the sensor should be flush against the engine in order to ensure proper orientation. The sensor mounting bracket should not be bent.Results:
OK - The engine speed/timing sensor is seated properly and the bracket is not bent. Proceed to Test Step 4.
Not OK - The engine speed/timing sensor is not seated properly or the bracket is bent.Repair: Perform the following procedure in order to properly install the sensors and the bracket:
Loosen the bolt that holds the sensor mounting bracket to the engine.
Seat the sensor and tighten the bolt.If the sensor will not seat, repair the sensor or replace the sensor, as required.Note: The sensor must not be removed from the bracket.
Ensure that the sensor is properly oriented and that the harness is secured in the proper location.
Verify that the repair eliminates the problem. Stop.Test Step 4. Check Engine Speed on the Electronic Service Tool
Turn the keyswitch to the ON position and crank the engine.
Observe the engine speed on the electronic service tool while you crank