SEAL-O-RING 2774993 - Caterpillar

Illustration 1 g01208740
Left side view
(1) Engine speed/timing sensor
Illustration 2 g01524537
Schematic
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Illustration 3 g01234146
Location of ECM connectors
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01524544
P1 ECM connector
(P1-51) Digital return
(P1-33) Engine speed/timing signal
(P1-40) Engine timing calibration -
(P1-41) Engine timing calibration +
(P1-43) +12 V supply
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for a "Logged" Diagnostic Code
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Check the diagnostic codes on Cat ET. Expected Result:Cat ET indicates that a 190-08 diagnostic code has recently been logged.Results:
OK - The 190-08 diagnostic code is logged. Proceed to Test Step 3.
Not OK - The 190-08 is not logged.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 3. Check the Supply Voltage to the Sensor
Disconnect the connector for the engine speed/timing sensor.
Turn the keyswitch to the ON position.
Measure the voltage between terminal A and terminal B at the sensor connector. Expected Result:The supply voltage is 12 1.0 VDC.Results:
OK - The supply voltage is 12 1.0 VDC. Proceed to Test Step 4.
Not OK - The supply voltage is not 12 1.0 VDC. Proceed to Test Step 6.Test Step 4. Check the Signal Voltage at the Sensor
Turn the keyswitch to the OFF position.
Remove the wire from terminal C of the sensor connector.
Turn the keyswitch to the ON position.
Measure the voltage between the sensor signal wire and terminal B of the sensor connector. Crank the engine and measure the voltage between the sensor signal wire and terminal B.
Turn the keyswitch to the OFF position.
Reconnect the signal wire. Expected Result:The voltage measures less than 3 VDC or more than 9 VDC when the keyswitch is in the ON position and the engine is not cranking. While the engine is cranking, the voltage is between 2.0 VDC and 7.0 VDC.Note: The voltage output is determined by the presence or the absence of a tooth on the timing gear.Results:
OK - The engine speed/timing sensor is producing the correct output signal. Proceed to