10254080 Mercury OPERATION MANUAL, 75/90/115 EFI L4NA, English

Illustration 1 g01261783
Schematic
Illustration 2 g01204484
P2 ECM connector
(P2-15) Intake manifold (boost) pressure sensor
(P2-17) Sensor return
(P2-28) Engine oil pressure sensor
(P2-40) Fuel pressure sensor
(P2-57) Atmospheric pressure sensor
(P2-72) Sensor supply
Illustration 3 g01259757
Terminal locations at the P1 ECM connector
(P1-15) Turbocharger inlet pressure sensor
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Locations of the pressure sensors (typical left side engine view)
(1) Intake manifold (boost) pressure sensor
(2) Atmospheric pressure sensor
(3) Engine oil pressure sensor
(4) Fuel pressure sensor
(5) J2/P2 ECM connectors
(6) J1/P1 ECM connectors
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Typical air filter assembly
(7) Turbocharger inlet pressure sensor
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Terminal locations at the sensor connector
(A) Sensor supply
(B) Sensor return
(C) Sensor signal Test Step 1. Inspect Electrical Connectors and Wiring
Remove the electrical power from the ECM.
Thoroughly inspect connectors (5) and (6). Also, thoroughly inspect the connectors for sensors (1), (2), (3), (4), and (7). Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and on each of the wires in the pressure sensor connectors.
Check the allen head screw for each of the ECM connectors and the machine connectors for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Check the harness and wiring for abrasions and for pinch points from each of the pressure sensors back to the ECM. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and 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 for each of the connectors are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the ECM. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Monitor Cat ET for an active 262-03 code, an active 262-04 code, or an active 100-10 code.
Remove the electrical power from the ECM. Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: If the problem is intermittent refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - There is an active -03 code, an active -04 code, or an active -10 code at this time: Proceed to Test Step 3.Test Step 3. Disconnect the Pressure Sensors and Check for Active Diagnostic Codes
Restore the electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET while you disconnect each pressure sensor connector. Check for an active diagnostic code. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the following sensors one at a time:
Engine oil pressure sensor
Intake manifold (boost) pressure sensor
Fuel pressure sensor
Atmospheric pressure sensor
Turbocharger Inlet pressure sensor
Remove the electrical power from the ECM. Expected Result:The diagnostic code deactivates when a particular sensor is disconnected.Results:
OK - The -03 code, the -04 code, or the -10 diagnostic code deactivates when a particular sensor is disconnected.Repair: Connect the suspect sensor. If the code returns, replace the sensor. Connect all of the connectors. Verify that the problem is resolved.STOP
Not OK - The -03 code, the -04 code, or the -10 diagnostic code remains active after all of the sensors are disconnected. Leave the sensors disconnected. The sensors are not the cause of the diagnostic code. Proceed to Test Step 4.Test Step 4. Check the Supply Voltages at the ECM
Disconnect the J2/P2 ECM connector.
Fabricate four jumper wires that are long enough to be used to measure the supply voltage at the ECM connectors. Crimp connector sockets to one end of each jumper wire.
Remove the wires from terminal locations P2-72 (sensor supply) and P2-17 (sensor return). Install a jumper wire into each of these terminal locations.
Connect the J2/P2 ECM connector.
Restore the electrical power to the ECM.
Measure the voltage between the jumper wire in P2-72 (sensor supply) and the jumper wire in P2-17 (sensor return).
Remove the electrical power from the ECM. Expected Result:The voltage measurement is 5.0 0.2 VDC.Results:
OK -