GAUGE AS-PRESSURE 4W0509 - 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.Note: The Generator Set has a jumper wire between terminals 6 and 9 on the Engine Control Switch (ECS). This jumper wire provides power to the Generator Set Control (GSC+) when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. Unless a timer is installed in the circuit, this jumper wire also provides power to the key switch input of the engine ECM when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. The timer interrupts power to the key switch input of the engine ECM when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. Cycling power to the key switch input of the ECM will reset the ECM and all active diagnostic codes. The bottom dial on the timer should be set to 0.7. The middle dial on the timer should be set to 3 seconds. The top dial on the timer should be set to E.
Illustration 1 g00594171
SchematicTest Step 1. Check for "ACTIVE" Diagnostic Codes.
Turn the ECS to the OFF/RESET position.
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 ECS to the START position.
Allow the engine to exit cold mode operation.Expected Result:Only CID-FMI 261-13 should be 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