19064 Mercruiser BUSHING

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The ECM provides a path to ground for the warning lamp. When the ECM connects the warning lamp to ground the warning lamp will turn on.
The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.
Test Step 1. Check for Normal Operation of the Warning Lamp
Monitor the warning lamp.
Turn the keyswitch to the ON position. The warning lamp should turn on for five seconds. Then, the lamp should turn off.Note: The lamp will remain on or flash if a warning or a derate is active.Expected Result:The warning lamp turns on and the warning lamp turns off per the above description.Results:
OK - The warning lamp appears to be operating correctly at this time.STOP
Not OK - The warning lamp is not functioning correctly. Proceed to Test Step 2.Test Step 2. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
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Left side engine view (typical example) (1) J1/P1 ECM connector
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Left side engine view (typical example) (2) P61 Customer connector
Thoroughly inspect connectors (1) and (2). Inspect the connections on the warning lamp. Refer to Troubleshooting, "Electrical Connectors - Inspect".
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P1 terminals that are associated with the warning lamp (P1-29) Warning lamp
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J61 and P61 terminals that are associated with the warning lamp (25) Warning lamp
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the warning lamp.
Check the allen head screw on each ECM connector and the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasions and for pinch points from the warning lamp to the ECM.Expected Result:All of the connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and the wiring are OK. Proceed to Test Step 3.
Not OK - There is a problem with a connector and/or the wiring.Repair: Repair the connector and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved.STOPTest Step 3. Test the Warning Lamp Circuit at the ECM Connector
Disconnect the J1/P1 connectors.
Connect a jumper wire between terminal P1-30 and engine ground.
Turn the keyswitch to the ON position. Observe the warning lamp.
Remove the jumper wire and observe the warning lamp.Expected Result:The warning lamp turned on while the jumper was connected. The warning lamp turned off when the jumper was removed.Results:
OK - The warning lamp turned on while the jumper was connected. The warning lamp turned off when the jumper was removed. The warning lamp circuit is functioning properly. Proceed to Test Step 6.
Not OK - The warning lamp did not turn on. There is a problem with the circuit for the warning lamp. Proceed to Test Step 4.Test Step 4. Test the Circuit at the Warning Lamp
Disconnect wire F420-GN from the warning lamp.
Connect a jumper wire between the lamp's open terminal and engine ground.
Turn the keyswitch to the ON position. Observe the warning lamp.
Disconnect the jumper wire and observe the warning lamp.Expected Result:The warning lamp turns on while the jumper is connected. The warning lamp turns off when the jumper is disconnected.Results:
OK - The warning lamp turned on while the jumper wire was connected. The warning lamp turned off when the jumper wire was removed. The +Battery side of the circuit for the warning lamp is functioning properly. There is a problem with the return wire between the warning lamp and the P1 connector.Repair: Repair wire F420-GN between the warning lamp and terminal P1-29. Verify that the problem is resolved.STOP
Not OK - The warning lamp did not turn on when the jumper wire was connected. There is a problem with the +Battery side of the circuit for the warning lamp. Proceed to Test Step 5.Test Step 5. Check the Voltage from the Keyswitch to the Warning Lamp
Turn the keyswitch to the OFF position.
Remove the wire from the terminal R of the keyswitch.
Turn the keyswitch to the ON position.
Measure the voltage on terminal B of the keyswitch to engine ground.
Measure the voltage on terminal R of the keyswitch to engine ground.
Turn the keyswitch to the OFF position.Expected Result:Voltage is present on terminal B and terminal R at the keyswitch.Results:
OK - Voltage is present on terminal B and terminal R at the keyswitch.Repair: If voltage is present on terminal R, repair the wire between the keyswitch and the warning lamp. Verify that the breaker is not tripped. Return all wiring to the original configuration. Verify that the problem is resolved.STOP
Not OK - Voltage is not present on terminal B at the keyswitch.Repair: If voltage is not present on terminal B, repair the wire between the +Battery and the keyswitch. Check the battery's no-load voltage. Return all wiring to the original configuration. Verify that the problem is resolved.STOP
Not OK - Voltage is not present on terminal R at the keyswitch.Repair: If voltage is present on terminal B of the keyswitch but not present on terminal R, replace the keyswitch. Return all wiring to the original configuration. Verify that the problem is resolved.STOPTest Step 6. Check the Operation of the ECM
Remove terminal P1-29.