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Illustration 1 g01267248
Schematic for the engine speed/timing sensors
Test Step 1. Check for Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to electronic troubleshooting Troubleshooting, "Electronic Service Tools".
Restore the electrical power to the ECM.
Start the engine and run the engine until the engine is at normal operating temperature. Note: If the engine will not start, monitor the engine rpm on Cat ET while the engine is being cranked. Cat ET may need to be powered from another battery while the engine is being cranked.
Look for these codes on Cat ET: Note: Wait at least 30 seconds in order for any codes to become active.
190-08
342-08Expected Result:One or both of the diagnostic codes that are listed above are logged or active.Note: If the engine will not start and Cat ET displayed 0 rpm during cranking, select "No Engine rpm".Results:
No Engine rpm - Engine rpm is not indicated on Cat ET. Proceed to Test Step 2.
-08 code - There is an active diagnostic code or a logged diagnostic code for the engine speed/timing sensor. Proceed to Test Step 4.Test Step 2. Check the Installation of the Sensor Assembly
Remove the electrical power from the ECM.
Illustration 2 g01120250
Typical left side view
(1) Engine
(2) Flanges
(3) Bracket
Visually inspect the sensor assembly without removing the sensor assembly from the engine. Flanges (2) must be flush against engine (1) in order to ensure proper operation. Inspect bracket (3). Verify that the bracket allows the flanges to be flush against the engine.Verify that the bracket is not bent. If the bracket is bent or if an obstruction is preventing the sensor assembly from being installed correctly, the engine will not start.Note: The bracket cannot be replaced separately.
Remove the sensor assembly from the engine.
Illustration 3 g01223456
Sensor assembly
(4) O-ring
Ensure that one O-ring (4) is installed on each sensor. Check the O-rings for damage. Replace the O-rings, if necessary. Results:
OK - The sensor assembly's components are OK.Repair: Perform the following procedure in order to properly install the sensor assembly:
Lubricate each O-ring with engine oil.
Fully seat the sensor assembly in the engine. Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
Tighten the bracket bolt.
Connect the sensor's electrical connectors. Verify that the connectors are latched on both sides.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location. Proceed to Test Step 3.
Not OK - At least one of the sensor assembly's components is not OK.Repair: Obtain a new sensor assembly. Perform the following procedure in order to properly install the sensor assembly:
Lubricate each O-ring with engine oil.
Fully seat the sensor assembly in the engine. Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
Tighten the bracket bolt.
Connect the sensor's electrical connectors. Verify that the connectors are latched on both sides.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location. Verify that the problem is resolved.STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Illustration 4 g01235550
Typical left side view
(5) P400 connector for engine timing calibration
(6) J2/P2 ECM connector
(7) J401/P401 connectors for the primary engine speed/timing sensor
(8) J402/P402 connectors for the secondary engine speed/timing sensor
Thoroughly inspect connectors (5), (6), (7), and (8). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Illustration 5 g01144149
P2 terminations for the engine speed/timing sensors
(P2-25) Primary engine speed/timing −
(P2-35) Primary engine speed/timing +
(P2-46) Secondary engine speed/timing +
(P2-47) Secondary engine speed/timing −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the engine speed/timing sensors.
Check the torque of the allen head screws for the ECM connectors. Refer to the diagnostic functional test Troubleshooting, "Electrica