ELECTRONIC CONTROL GROUP 1493253 - Caterpillar

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 g01169168
Schematic
Test Step 1. Check for "ACTIVE" Diagnostic Codes
Turn the engine control to the OFF/RESET mode.
Turn the battery disconnect switch to the OFF position.
Connect the Caterpillar Electronic Technician (ET) at the service tool connector J60/P60. Start the Cat ET.
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.
Turn the battery disconnect switch to the ON position.
Turn the engine control to the STOP mode. Expected Result:Only CID-FMI 261-13 is active.Results:
OK - CID-FMI 261-13 is the only active code at this time. Proceed to test step 2.
Not OK - CID-FMI 261-13 is not the only active code at this time.Repair: Repair any active diagnostic codes.STOPTest Step 2. Calibration
Select "Service" from the main menu on the Cat ET. Select "Calibrations" from the drop-down menu. Select "Timing Calibration".
Press the "Continue" button on the Cat ET. Note: Engine speed will be set to 800 rpm by the ECM during the calibration.Note: If the Cat ET screen shows "CALIBRATION UNSUCCESSFUL", the electronic injection timing has not been set.Expected Result:The timing calibration is successful.Results:
OK - The timing calibration was successful. Disconnect the timing calibration probe before you exit the "Timing Calibration" screen on the Cat ET. Reset the system and check for any diagnostic codes.STOP
Not OK - The timing did not calibrate.Repair: Verify that the engine speed was stable during the testing ( 50 rpm). If the engine speed was unstable or the engine speed could not be controlled within 50 rpm because of mechanical factors or of electrical factors, refer to the diagnostic procedure Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".If all of the problems have been corrected but the timing cannot be calibrated, check the cable of the 6V-2197 Timing Calibration Probe and check the 6V-2197 Timing Calibration Probe in order to verify that the probe is not bent. Verify that the probe is installed correctly before restarting this procedure.STOP