3579073 Volvo.Penta O-ring

Table 1
Diagnostic Trouble Codes for the Circuit for the EFLP Relay    
CDL Code    Description    Notes    
3666-5     Engine Fuel Supply Lift Pump Relay : Current Below Normal     The Electronic Control Module (ECM) detects the following conditions:
There are no active 168 diagnostic codes.
The ECM is not attempting to power the relay.
The ECM has been powered for at least 2 seconds.
There is a low current condition in the fuel lift pump relay circuit for more than 2 seconds.
The Engine System Indicator lamp will come on. The diagnostic code will be logged.
The ECM is unable to activate the relay for the fuel lift pump. The fuel lift pump will not operate or the fuel lift pump will operate all the time. The engine will not operate.    
3666-6     Engine Fuel Supply Lift Pump Relay : Current Above Normal     The ECM detects the following conditions:
There are no active 168 diagnostic codes.
The ECM is attempting to power the relay.
The ECM has been powered for at least 2 seconds.
There is a high current condition in the fuel lift pump relay circuit for more than 2 seconds.
The Engine System Indicator lamp will come on. The diagnostic code will be logged.
The ECM is unable to activate the relay for the fuel lift pump. The fuel lift pump will not operate or the fuel lift pump will operate all the time. The engine will not operate.
The ECM will continue to attempt to activate the relay. If the current is OK for 6 seconds, then the diagnostic code will be cleared.    The following background information is related to this procedure:The EFLP is used in order to provide positive fuel pressure to the high-pressure fuel pump. When the keyswitch is turned to the ON position, the ECM will activate the relay for the EFLP. If the engine is not running, the ECM will deactivate the relay for the EFLP after 2 minutes.
Illustration 1 g02597297
Schematic for the Electric Fuel Lift Pump (EFLP)
Illustration 2 g02454536
View of the pin location on the P1 connector for the EFLP (36) Relay for the EFLPTest Step 1. Inspect Electrical Connectors and Wiring
Check that the fuses are not blown.
Check the harness for abrasion and pinch points from the Electric Fuel Lift Pump (EFLP) back to the ECM. Check the harness for abrasion and pinch points from the EFLP back to the battery.
Inspect the terminals on the EFLP relay and then inspect the harness connector for the relay. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Inspect the connector for the EFLP. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the EFLP.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).Results:
All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points. The fuses are not blown - Proceed to Test Step 2.
There is a fault with the harness and connectors - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly connected. Replace blown fuses.
Turn the keyswitch to the ON position. Do not start the engine. Check for active diagnostic codes.
Wait for at least 2 minutes for the EFLP to deactivate. Check for active diagnostic codes.
Confirm that the fault has been eliminated.Note: If a fuse is replaced and the fault reoccurs, continue with this procedure.STOPTest Step 2. Check for Active Diagnostic Codes
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.Note: Do not start the engine.
Make a note of any active diagnostic codes.
Wait for at least 2 minutes for the Electric Fuel Lift Pump (EFLP) to deactivate.
Make a note of any active diagnostic codes.Results:
Diagnostic code 3666-5 is active when the EFLP is switched off. - Proceed to Test step 3.
Diagnostic code 3666-6 is active when the EFLP is switched on. - Proceed to Test Step 5.
An active diagnostic code or a recently logged diagnostic code was not displayed. - There may be a fault with the switched power circuit for the EFLP. The ECM does not monitor the status of this condition. Proceed to Test Step 9.Test Step 3. Create a Short Circuit at the Fuel Lift Pump Relay
Turn the keyswitch to the OFF position.
Disconnect the connector for the Electric Fuel Lift Pump (EFLP) relay.
Fabricate a jumper wire that is 150 mm (6 inch) long.
Use the jumper wire to connect Test Point 1 to Test point 2 on the harness connector for the EFLP relay. Refer to Illustration 1.
Turn the keyswitch to the ON position. Do not start the engine.
Use the electronic service tool to check for an active 3666-6 diagnostic code.
Wait for at least 2 minutes for the EFLP to deactivate. Check for an active 3666-5 diagnostic code.
Turn the keyswitch to the OFF position.
Remove the jumper. Leave the connector for the EFLP relay disconnected.Results:
A 3666-6 diagnostic code was active with the jumper installed. - There are no faults in the wiring for the EFLP relay.Repair: Perform the following repair:
Install a replacement relay.
Reconnect the connector for the EFLP relay.
Turn the keyswitch to the ON position. Do not start the engine. Check for active diagnostic codes.
Wait for at least 2 minutes for the EFLP to deactivate. Check for active diagnostic codes.
Confirm that the fault has been eliminated.STOP
A 3666-5 diagnostic code is still active with the jumper installed - Proceed to Test Step 4.Test Step 4. Measure the Voltage at the Relay Connector
Turn the keyswitch to the ON position. Do not start the engine.
Use a voltmeter to measure between Test Point 1 on the harness connector for the Electric Fuel Lift Pump (EFLP) relay and a suitable ground. Refer to Illustration 1.Expected Result:The measured voltage should be a constant 22.0 to 27.0 VDC.Results:
OK - The voltage is within the expected range. The wiring to the input of the EFLP