CARBURETOR GP 9Y0830 - Caterpillar

Illustration 1 g01241934
Typical schematic
Illustration 2 g01216172
P1 ECM connector
(P1-5) Digital return
(P1-33) Engine speed/timing signal
(P1-40) Engine timing calibration -
(P1-41) Engine timing calibration +
(P1-43) +12.5 V supply
Illustration 3 g01218411
Typical left side view
(1) Engine speed/timing sensor
Illustration 4 g01234146
Location of ECM connectors
Test Step 1. Inspect Electrical Connectors and Wiring
Remove electrical power from the ECM.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
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, "Inspecting Electrical Connectors" 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 an "ACTIVE" or "LOGGED"Diagnostic Code
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Check the diagnostic codes on Cat ET. Expected Result:No diagnostic codes are active or logged repeatedly.Results:
OK - A diagnostic code for the engine speed/timing sensor is not active or logged repeatedly.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - A diagnostic code for the engine speed/timing sensor is active or logged repeatedly. Proceed to Test Step 3.Test Step 3. Check the Supply Voltage to the Sensor
Disconnect the connector for the engine speed/timing sensor.
Restore electrical power to the ECM.
Measure the voltage between terminal A and terminal B at the sensor connector. Expected Result:The supply voltage is 12.5 1 VDC.Results:
OK - The supply voltage is 12.5 1 VDC. Proceed to Test Step 4.
Not OK - The supply voltage is not 12.5 1 VDC. Proceed to Test Step 6.Test Step 4. Check the Signal Voltage at the Sensor
Remove electrical power from the ECM.
Remove the wire from terminal C of the sensor connector.
Restore electrical power to the ECM.
Measure the voltage between the sensor's signal wire and terminal B of the sensor connector. Crank the engine and measure the voltage between the sensor signal wire and terminal B.
Remove electrical power from the ECM.
Reconnect the signal wire. Expected Result:The voltage measures less than 3 VDC or more than 9 VDC when the ECM is powered and the engine is not cranking. While the engine is cranking, the voltage is between 2 VDC and 7 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