LINES GP-FUEL INJECTION 7N1646 - Caterpillar

Operation Description:The engine speed/timing sensor provides engine information to the engine's 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
Typical exampleTest Step 1. Check for Active Diagnostic Codes.
Start the Caterpillar Electronic Technician (ET).
Start the engine.
Operate the engine until normal operating temperatures are obtained.Expected Result:There is one active diagnostic code 261-13.Results:
OK - The active diagnostic code is 261-13. Proceed to Test Step 2.
Not OK - There is more than one active diagnostic code.Repair: Repair any active diagnostic codes.STOPTest Step 2. Calibrate the Fuel Injection Timing.
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.
Select "Calibrations" from the "Service" menu on the Cat ET. Select the "Timing Calibration" from the "Calibrations" menu.
Follow the instructions on the Cat ET screen.Note: If the Cat ET screen reads "COULD NOT CALIBRATE", the timing has not been set.Expected Result:The timing calibration procedure was successful.Results:
OK - The timing calibration procedure was completed successfully.Repair: 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 could not be calibrated. 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 electrical factors, refer to the diagnostic procedure Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".Excessive backlash in the engine gear train will cause inconsistent timing. Refer to Systems Operation for identifying and repairing a gear train problem.If all of the problems have been corrected but the timing can not 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