TANK AS-TOP 7W1481 - Caterpillar

Be sure to extend the sliphead before installing the Engine Speed/Timing Sensor. Also check that the Timing Gear is in a position that will not allow the sliphead of the Engine Speed/Timing Sensor to protrude into one of the slots of the Timing Gear. This is done visually with a flashlight prior to the installation of the Engine Speed/Timing Sensor. Turn the crankshaft to rotate the Timing Gear, if necessary, to position the gear in a place that will not allow the sliphead to protrude into a slot. If the sensor sliphead does protrude into one of the slots, the sliphead will be broken off as the gear begins to rotate.
Remove the suspect Engine Speed/Timing Sensor.
Inspect the plastic sliphead for damage.
Check the tension. Gently extend the sliphead 3.5 mm (0.14 inch). Return the sliphead to the original position.
Extend the sliphead.
Install the Engine Speed/Timing Sensor.Expected Result:The sliphead should take at least 22 N (5 lb) of force to push in the sliphead from the extended position.Results:
OK - The Engine Speed/Timing Sensor and the sliphead are undamaged. The tension on the sliphead is normal. Reinstall the sensor. Proceed to test step 6.
Not OK - The Engine Speed/Timing Sensor or the sliphead is damaged, or the sliphead has insufficient tension.Repair: Replace the Engine Speed/Timing Sensor. Calibrate the sensor. Perform the diagnostic calibration procedure Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".STOPTest Step 6. Check the Engine Speed on the Cat ET Screen.
Start the Cat ET.
Turn the engine control to the ON position.
Start the engine.
Observe the engine speed on the status screen of the Cat ET while you crank the engine.Expected Result:The Cat ET should display a steady engine speed between 100 and 250 rpm while the engine is cranking.Results:
OK - The Engine Speed/Timing Sensor is operating normally at this time. Repair: There may be an intermittent problem. Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" if the problem is intermittent.STOP
Not OK - The Cat ET status screen does not display a steady engine speed between 100 and 250 rpm while the engine is cranking. Proceed to test step 7.
Intermittent Problem - The Cat ET status screen displays an erratic engine rpm.Repair: Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".STOPTest Step 7. Check the Supply Voltage at the Sensor Connector.
Turn the engine control to the OFF position.
Disconnect the Engine Speed/Timing Sensor.
Turn the engine control to the ON position.
Measure the voltage between socket A and socket B at the Engine Speed/Timing Sensor.
Turn the engine control to the OFF position.
Reconnect the sensor connector.Expected Result:The supply voltage should be 13 1.0 VDC.Results:
OK - The supply voltage is 13 1.0 VDC. The sensor is receiving the correct supply voltage. Proceed to test step 8.
Not OK - The supply voltage is not 13 1.0 VDC. Proceed to test step 9.Test Step 8. Check the Isolated Signal Voltage at the Sensor.
Turn the engine control to the OFF position.
Remove the wire at pin-C from either P20 or P44.
Turn the engine control to the ON position.
Measure the