826410 30 Mercury SCREW (M8 X 30)160

Illustration 1 g01437366
Schematic for the circuit for the fuel actuator
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM. Set the engine control to the OFF/RESET mode. Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g01392585
Location of the components for the fuel actuator (typical left side engine view)
(1) J1/P1 ECM connectors
(2) Fuel actuator
(3) Interface box
Thoroughly inspect ECM connectors (1), the connectors for actuator (2), and the connectors at the interface box (3).
Check the allen head screw for each of the ECM connectors for the proper torque.
Illustration 3 g01391850
Terminal locations at the P1 ECM connector for the fuel actuator
(34) CAN data link −
(42) Shield
(50) CAN data link +
Illustration 4 g01392686
Terminal locations at the connector for the fuel actuator
(A) CAN Ident
(C) Shield for the CAN data link
(F) Keyswitch
(G) CAN data link−
(M) CAN data link+
(Q) −Battery
(Z) +Battery
Illustration 5 g01392608
Terminal locations at the interface box for the throttle actuator
(7) Keyswitch
(9) −Battery
(F1) Main fuse (15 Amp)
(F2) Fuse for the throttle actuator (10 Amp)
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the fuel actuator.
Check the wiring for abrasion and for pinch points from the fuel actuator to the ECM. Expected Result:All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary. Ensure that all of the seals are properly installed. Ensure that the connectors are properly engaged. Verify that the repair has eliminated the original problem.STOPTest Step 2. Check for Diagnostic Codes
Establish communication between the Caterpillar Electronic Technician (ET) and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Look for the following diagnostic codes:
1442-9 Fuel Actuator #1 abnormal update rate
1442-11 Fuel Actuator #1 other failure mode
1442-12 Fuel Actuator #1 failureExpected Result:There is not an active diagnostic code for the fuel actuator at this time.Results:
OK - There is not an active diagnostic code for the fuel actuator at this time.Repair: There does not seem to be an electrical problem with the fuel actuator. If one of the codes is logged, there may be an intermittent problem in the harness or in a connector. There may be a problem with one of the fuses in the circuit.Check that electrical power is available at the throttle actuator. If an intermittent problem with the harness or a connector is suspected, refer to Troubleshooting, "Inspecting Electrical Connectors" for information that is related to troubleshooting intermittent electrical problems.STOP
Not OK - 1442-9 is active - The ECM has detected a problem with the communication between the ECM and the fuel actuator. Proceed to Test Step 4.
Not OK - 1442-11 or 1442-12 is active - There is a problem with the fuel actuator.Repair: Replace the fuel actuator. Verify that the problem is resolved.STOPTest Step 3. Check for Electrical Power at the Fuel Metering Valve
Refer to Illustration 1. Measure the voltage for the fuel metering valve at the engine interface box. The battery voltage must be between 18 V and 32 V in order for the fuel metering valve to operate correctly. If a problem exists, correct the problem before you continue.
Remove electrical power from the ECM. Set the engine control to the OFF/RESET mode.
Disconnect the harness connector for the fuel metering valve.
Restore electrical power to the ECM. Set the engine control to the STOP mode.
At the harness connector for the valve, measure the voltage between the following terminals:
F and Q (keyswitch power)
Z and Q (battery power)Results:
OK - Both voltages at the harness connector are within 2 V of the voltage at the engine power distribution box. Proceed to Test Step 4
Not OK - At least one of the voltages are not within 2 V of the voltage at the engine power distribution box.Repair: The fuel metering valve is not receiving the proper operating voltage. There is a problem in the harness or in a connector. Determine the cause of the excessive voltage drop. Perform the necessary repairs. Verify that the repair eliminates the original problem.STOPTest Step 4. Check the Connection for the Harness IdentificationNote: In order for the device to be recognized as the fuel actuator terminal A, must be grounded.
Disconnect the harness connector from the fuel actuator.
Measure the resistance between term