TUBE 4K8621 - Caterpillar

codes is active, there may be a problem with the assembly of the engine:
320-11 Speed/Timing Sensor mechanical failure
342-11 Secondary Engine Speed Sensor mechanical failureExpected Result:The sensors and the bracket are properly installed.Results:
OK - The sensors and the bracket are properly installed. Proceed to Test Step 3.
Not OK - 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.STOPTest Step 3. Inspect Electrical Connectors and Wiring
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 following wires in the P2 ECM connector that are associated with the engine speed/timing sensors:
P2:48 (Primary Engine Speed/Timing +)
P2:49 (Primary Engine Speed/Timing -)
P2:58 (Secondary Engine Speed/Timing +)
P2:59 (Secondary Engine Speed/Timing −)
Ensure that the latch tab on the connector is properly latched and ensure that the latch tab is fully latched.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
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 for abrasions.
Ensure that the wiring harness is correctly routed and secured at the proper locations.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and the wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and the wiring are OK. Proceed to Test Step 4.
Not OK - There is a problem with the connectors and/or the 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.STOPTest Step 4. Measure the Circuit Resistance at the ECM Connector
Disconnect the J2/P2 ECM connector.
Primary engine speed/timing sensor
Measure the resistance between P2:48 (Primary Engine Speed/Timing +) and P2:49 (Primary Engine Speed/Timing -).Note: Check for an intermittent problem (open or short) by moving the harness while you measure the resistance. Pull the wires that are directly behind the sensors and shake the wires that are directly behind the sensors.Resistance ... 75.0 to 230.0 Ohms
Secondary engine speed/timing sensor
Measure the resistance between P2:58 (Secondary Engine Speed/Timing +) and P2:59 (Secondary Engine Speed/Timing −).Note: Check for an intermittent problem (open or short) by moving the harness while you measure the resistance. Pull the wires that are directly behind the sensors and shake the wires that are directly behind the sensors.Resistance ... 600 to 1800 OhmsExpected Result:The readings agree with the values that are listed above.Results:
OK