ELBOW 6N5503 - Caterpillar

System Operation Description:The Engine Speed/Timing Sensor provides engine information to the Electronic Control Module (ECM). The sensor generates a pulse signal. A loss of the engine speed/timing signal causes the ECM to stop sending power to the fuel injectors.The ECM provides the Engine Speed/Timing Sensor with 12.5 1.0 VDC. A unique tooth on the timing reference gear generates a unique duty cycle. The signal provides the ECM with information on the engine position.
Illustration 1 g00594171
SchematicTest Step 1. Check for CID-FMI
Connect the Electronic Technician at the Service Tool Connector.
Remove the timing calibration plug from the flywheel housing.
Examine the flywheel through the timing calibration hole. Ensure that the probe is not inserted into the timing pin hole. If necessary, turn the engine.
Install the 6V-3093 Transducer Adapter into the hole for the timing calibration at the flywheel.
Insert the 6V-2197 Magnetic Transducer through the 6V-3093 Transducer Adapter. Insert the transducer until contact is made with the surface of the flywheel. Move the transducer 0.9 mm (0.04 inch) away from the flywheel.
DO NOT INSTALL THE TIMING CALIBRATION PROBE OVER THE TIMING PIN HOLE AT THE FLYWHEEL OR DAMAGE WILL RESULT.
Tighten the nut on the 6V-3093 Transducer Adapter .
Connect the 7X-1695 cable from the engine timing calibration probe to the connector P26.
Start the engine. Allow the engine to exit cold mode operation.Expected Result:Only CID-FMI 261-13 should be active.Results:
OK - Proceed to test step 2.
Not OK - Repair: Repair any active diagnostic codes. Stop.Test Step 2. Calibration
Select "Service" from the main menu on the ET. Select "Calibrations" from the drop down menu. Select Timing Calibration.
Press the "Continue" button on the ET. Wait until the ET indicates that the ECM has calculated the timing reference.Note: Engine speed will be set to 800 rpm by the ECM during the calibration.Note: If the Electronic Technician reads "CALIBRATION UNSUCCESSFUL" the electronic injection timing has not been set.Expected Result:The timing should calibrate.Results:
OK - The timing calibration was successful. Stop.
Not OK - The timing did not calibrate.Repair: Excessive backlash in the engine gear train will cause inconsistent timing. Refer to Systems Operation for identifying and repairing a gear train problem. Stop.