31583109 Mercury FUEL LINE, FUEL PUMP TO CARBURETOR

Illustration 1 g01150575
Schematic for the indicator lamps
Test Step 1. INSPECT THE ELECTRICAL CONNECTORS AND THE WIRING
Remove the electrical power from the ECM.
Illustration 2 g01146374
Engine view (typical example)
(1) J1/P1 ECM connector
Illustration 3 g01146383
Engine view (typical example)
(2) J61/P61 customer connectors
Thoroughly inspect connectors (1) and (2). Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01130328
P1 terminals that are associated with the indicator lamps
(P1-19) Diagnostic lamp
(P1-20) Warning lamp
(P1-21) Maintenance indicator lamp
(P1-28) Low oil pressure lamp
(P1-29) High coolant temperature lamp
(P1-30) Engine coolant level indicator lamp
(P1-53) +Battery
(P1-63) −Battery
(P1-70) Keyswitch
Illustration 5 g01150664
J61/P61 terminals that are associated with the indicator lamps
(3) −Battery
(8) +Battery
(20) Engine coolant level indicator lamp
(21) High coolant temperature lamp
(22) Maintenance indicator lamp
(23) Low oil pressure lamp
(24) Diagnostic lamp
(25) Warning lamp
(30) Keyswitch
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the indicator lamps.
Check the allen head screw on each ECM connector for the proper torque. Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasions and for pinch points from the indicator lamps to the ECM. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in 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 NORMAL OPERATION OF THE LAMP
Restore the electrical power to the ECM and monitor the indicator lamps. Expected Result:The indicator lamps illuminate for five seconds. Then, the indicator lamps do not illuminate.Results:
OK - The indicator lamps illuminate for five seconds. Then, the indicator lamps do not illuminate.Repair: The problem appears to be resolved. The original problem was probably caused by a poor electrical connection. If an intermittent problem is suspected, refer to diagnostic functional tests Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - An indicator lamp does not illuminate. Proceed to Test Step 3.Test Step 3. MEASURE THE VOLTAGE AT THE LAMP SOCKET
Use a test lamp to check for voltage at the suspect lamp socket within the first five seconds after the electrical power is restored to the ECM. Expected Result:The test lamp should illuminate during the first five seconds after the electrical power is restored to the ECM.Results:
OK - The test lamp illuminates during the first five seconds after the electrical power is restored to the ECM.Repair: Replace the bulb.Verify that the repair eliminates the problem.STOP
Not OK - The test lamp did not illuminate during the first five seconds after the electrical power was restored to the ECM. Proceed to Test Step 4.Test Step 4. BYPASS THE ECM IN ORDER TO TEST THE LAMP CIRCUIT
Fabricate a jumper wire that can be used to connect two terminals at the P1 ECM connector. Crimp connector pins to both ends of the wire.
Disconnect the J1/P1 connectors.
Use the jumper wire to short one leg of the indicator lamp to the appropriate circuit connection. Refer to Table 1 for the appropriate terminals.
Table 1
P1 Terminals for the Connection of the Jumper Wire
Indicator Lamp Terminals
Low coolant level P1-30 P1-63
Low oil pressure P1-28 P1-63
High coolant temperature P1-29 P1-63
Maintenance indicator P1-21 P1-70
Diagnostic lamp P1-19 P1-70
Warning lamp P1-20 P1-70
Restore the electrical power to the ECM and observe the indicator lamp.
Remove the jumper wire and observe the indicator lamp. Expected Result:The indicator lamp illuminates while the jumper wire is connected to both terminals. The indicator lamp does not illuminate when the jumper wire is removed.Results:
OK - The indicator lamp illuminates while the jumper wire is connected to both terminals. The indicator lamp does not illuminate when the jumper wire is removed. The circuit for the indicator lamp is functioning properly.Repair: Perform the following procedure:
Connect the J1/P1 connectors.
Restore the electrical power to the ECM and monitor the indicator lamps. The indicator lamps should illuminate for five seconds. Then, the indicator lamps should not illuminate.If the indicator lamps illuminate for five seconds, the problem is resolved. Return the engine to service.STOP.
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