CORE AS-RADIATOR 3347677 - Caterpillar

System Operation Description:The Engine Speed/Timing Sensors provide engine information to the Electronic Control Module. The sensor generates a pulse signal. A loss of the signal causes the ECM to stop sending power to the fuel injectors.If the Primary Engine Speed/Timing Sensor fails, the ECM will use the Secondary Engine Speed/Timing Sensor until electrical power is removed from the ECM. To prevent any unnecessary down time, the primary sensor should be repaired or replaced at the earliest possible convenience.Test Step 1. Check for Engine Diagnostics
Connect an Electronic Service Tool.
Start the engine.
Operate the engine until normal operating temperatures are obtained.Expected Result:There should be one active Diagnostic Code 261-13.Results:
OK - Proceed to test step 2.
Not OK - Proceed to test step 3.Test Step 2. Calibrate the Fuel Injection Timing.
Select the Monitor/Calibrate Timing screen on the Electronic Service Tool.The end of the Timing Error bar should always be within the tolerance lines. If the Timing Error bar is NOT within the two sets of vertical timing error tolerance lines, the timing calibration is incorrectly set.
To calibrate the timing to the correct setting, press the space key on the Electronic Service Tool. Wait until the Electronic Service Tool indicates that the timing is calibrated.Note: Engine rpm will be set to 800 rpm. Verify that the timing has been calibrated. Observe the Timing Error bar on the Electronic Service Tool.Note: If the Electronic Service Tool reads "COULD NOT CALIBRATE" the timing has not been set.Expected Result:Results:
OK - The Timing Calibration procedure was completed successfully. Stop.
Not OK - The Timing could not be calibrated. Proceed to test step 4.Test Step 3. Repair any active Diagnostic Codes.Expected Result:Results:
Repair Complete - Stop.Test Step 4. Check for excessive backlash in the gear train.Expected Result:Results:
Repair Complete - Stop.