835426 2 Mercury DIPSTICK

Table 1
Diagnostic Trouble Codes for the Aftertreatment Regeneration Device (ARD) Fuel Pump Relay    
J1939 Code     Description     Notes    
5423-5     Aftertreatment Regeneration Device Fuel Pump Relay : Current Below Normal     The Electronic Control Module (ECM) detects the following conditions:
A low current condition (open circuit) in the circuit for the ARD fuel pump relay for one second.
The ECM has been powered for at least one second.
The ECM is not attempting to power the ARD fuel pump relay.    
5423-6     Aftertreatment Regeneration Device Fuel Pump Relay : Current Above Normal     The ECM detects the following conditions:
A high current condition (short circuit) in the circuit for the ARD fuel pump relay for at least one second.
The ECM has been powered for at least one second.
The ECM is attempting to power the ARD fuel pump relay.    
Illustration 1 g02159018
Typical schematic of the circuit for the ARD fuel pump
Illustration 2 g02159023
Typical example of the connector for the ARD fuel pump (1) Power (2) Return
Illustration 3 g02006473
View of the pin locations on the P2 connector for the ARD fuel pump relay (41) ARD fuel pump relay return (42) ARD fuel pump relay controlThe following background information is related to this procedure:The ARD increases the exhaust gas temperature to a sufficient level in order to burn off the soot that is collected in the Diesel Particulate Filter (DPF). The ARD requires a supply of fuel and clean air. The fuel supply is provided by the ARD fuel pump.When a regeneration is required, the ECM will activate the relay that controls the ARD fuel pump.Override for the RelayThe electronic service tool includes the "Aftertreatment Fuel Pump Override". This override will assist the analysis of the ARD fuel pump circuit. The override can be used to control the operation of the ARD fuel pump while the engine is not running.Test Step 1. Inspect Electrical Connectors and Wiring
Check that the fuses are not blown.
Check the harness for abrasion and pinch points from the ARD fuel pump back to the ECM. Check the harness for abrasion and pinch points from the ARD fuel pump back to the battery.
Inspect the terminals on the ARD fuel pump relay and then inspect the harness connector for the relay. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Inspect the connector for the ARD fuel pump. 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 ARD fuel pump.
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. Use the electronic service