FLANGE 2941839 - Caterpillar

Visually inspect the sensor without removing the sensor from the engine. Flange (2) must be flush against the engine in order to ensure proper operation. Inspect bracket (1) 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.
Remove the sensor. Ensure that one O-ring (3) is installed on the sensor. Check the O-ring for damage. Replace the O-ring, if necessary.Expected Result:The sensor's components are OK.Results:
OK - The sensor's components are OK.Repair: Perform the following procedure in order to properly install the sensor:
Lubricate the O-ring with engine oil.
Fully seat the sensor in the engine.Note: If the sensor will not fully seat into the engine, replace the sensor.
Tighten the bracket bolt.
Connect the sensor's electrical connector. Verify that the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the tie-wraps are placed in the correct location. Proceed to Test Step 3.
Not OK - At least one of the sensor's components is not OK.Repair: Obtain a new sensor. Perform the following procedure in order to properly install the new sensor:
Lubricate the O-ring with engine oil.
Fully seat the sensor in the engine.Note: If the sensor will not fully seat into the engine, replace the sensor.
Tighten the bracket bolt.
Connect the sensor's electrical connector. Verify that the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the tie-wraps are placed in the correct location.Verify that the repair eliminates the problem.STOPTest Step 3. Measure the Sensor Resistance through the Engine Harness
Turn the keyswitch to the OFF position.
Thoroughly inspect the J2/P2 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on the wires that are associated with the engine speed/timing sensors.
Ensure that the latch tab on each sensor connector is properly latched.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Repair the harness or repair the connector if a problem is found.
Ensure that the wiring harness is correctly routed and secured at the correct locations.
Ensure that the harness wiring is not pulled too tightly. When the harness wiring is pulled too tightly, vibrations or movement can cause intermittent connections.
Inspect the harness wiring for nicks and abrasions.
If the harness and the connector are OK, disconnect the J2/P2 ECM connector.
If you are troubleshooting a problem with the primary engine speed/timing sensor, perform the following procedure:
Measure the sensor's resistance between P2-35 (Primary engine speed/timing positive) and P2-25 (Primary engine speed/timing negative).
Check for an intermittent open circuit or for a short circuit by moving the harness while you take the resistance measurement. Pull the wires that are directly behind the sensor or shake the wires that are directly behind the sensor.Resistance ... 75 to 230 Ohms
If you are troubleshooting a problem with the secondary engine speed/timing sensor, perform the following procedure:
Measure the sensor's