ENCLOSURE GP-ENGINE 4429773 - Caterpillar

Illustration 3 g01151059
Flange of the sensor and mounting bracket
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 one O-ring has been installed on the sensor, and ensure that the O-ring is free of damage. Note: If the flange of the sensor is bent or if an obstruction is preventing the sensor from reading a good pattern, the engine will not start.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. Measure the Sensor Resistance Through the Engine Harness
Turn the ignition key switch to the OFF/RESET position.
Thoroughly inspect ECM vehicle harness 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:
P2-48
P2-49
P2-58
P2-59Refer 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. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
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 abrasions.
If the harness and the connector are OK, disconnect ECM connector J2/P2.
Use the following procedure to measure the sensor resistance (Ohms) for the primary speed/timing sensor: Refer to Illustration 2.
Use a multimeter to measure the resistance from P2-48 (primary engine speed/timing sensor positive) to P2-49 (primary engine 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