CASE AS-TRANSMISSION 2750467 - Caterpillar

Sensor mechanical failure
342-11 Secondary Engine Speed Sensor mechanical failureExpected Result:The sensors and the bracket are installed properly.Results:
OK - The sensors and the bracket are installed properly. Proceed to Test Step 4.
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 4. Measure the Sensor Resistance Through the Engine Harness
Turn the ECS to the OFF/RESET position.
Thoroughly inspect the ECM connector J2/P2. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on the following wires in the ECM engine harness connector P2 that are associated with the engine speed/timing sensors:
P2-58 (secondary camshaft speed/timing sensor positive)
P2-59 (secondary camshaft speed/timing sensor negative)
P2-48 (primary crankshaft speed/timing sensor positive)
P2-49 (primary crankshaft speed/timing sensor negative)Refer to Illustration 2.
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).
Repair the harness or repair the connector if a problem is found.
Ensure that the wiring harness is correctly routed and secured at the proper 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 for abrasions.
If the harness and the connector are okay, disconnect ECM connector J2/P2.
Use the following procedure to measure the sensor resistance (Ohms) for the secondary engine speed/timing sensor: Refer to Illustration 2.
Use a multimeter to measure the resistance from P2-58 (secondary camshaft speed/timing sensor positive) to P2-59 (secondary camshaft speed/timing sensor negative).
Check for an intermittent open circuit or short circuit by moving the harness while the measurement for resistance is being taken. Pull the wires that are directly behind the sensors or shake the wires that are directly behind the sensors. Resistance ... 1000 to 1200 Ohms
Use the following procedure to measure the sensor resistance (Ohms) for the primary engine speed/timing sensor: Refer to Illustration 2.
Use a multimeter to measure the sensor resistance (Ohms) from P2-48 (primary crankshaft speed/timing positive) to P2-49 (primary crankshaft speed/timing negative).
Check for an intermittent open circuit or short circuit by moving the harness while the measurement for resistance is being taken. Pull the wires that are directly behind the sensors or shake the wires that are directly behind the sensors. Resistance ... 110 to 200 OhmsExpected Result:The readings agree with the values that are listed above.Results:
OK - Neither a short circuit nor an open circuit is indicated. Proceed to Test Step 8.
Not OK - The sensor resistance is not within