87394A20 Mercruiser HARNESS ASSEMBLY, CONTROL PANEL

Table 1
J1939 Code and Description CDL Code and Description System Response
3363-5
Aftertreatment #1 DEF Tank Heater : Current Below Normal 3606-5
Aftertreatment #1 DEF Tank Heater Relay : Current Below Normal The code is logged.
3363-6
Aftertreatment #1 DEF Tank Heater : Current Above Normal 3606-6
Aftertreatment #1 DEF Tank Heater Relay : Current Above Normal The code is logged.
4336-5
Aftertreatment #1 SCR Dosing Air Assist Valve : Current Below Normal 3094-5
Aftertreatment #1 SCR Dosing Air Assist Signal : Current Below Normal The code is logged.
4336-6
Aftertreatment #1 SCR Dosing Air Assist Valve : Current Above Normal 3094-6
Aftertreatment #1 SCR Dosing Air Assist Signal : Current Above Normal The code is logged.
4354-5
Aftertreatment #1 DEF Line Heater #1 : Current Below Normal 3110-5
Aftertreatment #1 DEF Line Heater #1 : Current Below Normal The code is logged.
4354-6
Aftertreatment #1 DEF Line Heater #1 : Current Above Normal 3110-6
Aftertreatment #1 DEF Line Heater #1 : Current Above Normal The code is logged.
4355-5
Aftertreatment #1 DEF Line Heater #2 : Current Below Normal 3111-5
Aftertreatment #1 DEF Line Heater #2 : Current Below Normal The code is logged.
4355-6
Aftertreatment #1 DEF Line Heater #2 : Current Above Normal 3111-6
Aftertreatment #1 DEF Line Heater #2 : Current Above Normal The code is logged.
4357-5
Aftertreatment #1 DEF Line Heater #4 : Current Below Normal 3604-5
Aftertreatment #1 DEF Manifold Heater Relay : Current Below Normal The code is logged.
4357-6
Aftertreatment #1 DEF Line Heater #4 : Current Above Normal 3604-6
Aftertreatment #1 DEF Manifold Heater Relay : Current Above Normal The code is logged.
4376-5
Aftertreatment #1 DEF Return Valve : Current Below Normal 3120-5
Aftertreatment #1 DEF Return Signal : Current Below Normal The code is logged.
4376-6
Aftertreatment #1 DEF Return Valve : Current Above Normal 3120-6
Aftertreatment #1 DEF Return Signal : Current Above Normal The code is logged.
5435-5
Aftertreatment #1 DEF Pump State : Current Below Normal 3607-5
Aftertreatment #1 DEF Pump Heater Relay : Current Below Normal The code is logged.
5435-6
Aftertreatment #1 DEF Pump State : Current Above Normal 3607-6
Aftertreatment #1 DEF Pump Heater Relay : Current Above Normal The code is logged.
5706-5
Aftertreatment #1 Diesel Exhaust Fluid Pump Heater : Current Below Normal 3607-5
Aftertreatment #1 DEF Pump Heater Relay : Current Below Normal The code is logged.
5706-6
Aftertreatment #1 Diesel Exhaust Fluid Pump Heater : Current Above Normal 3607-6
Aftertreatment #1 DEF Pump Heater Relay : Current Above Normal The code is logged.
Illustration 1 g03724450
Schematic for the solenoid valves
Illustration 2 g03413650
DEF heated line circuit
Illustration 3 g03413759
DEF manifold circuit
Illustration 4 g03413762
DEF tank heater circuit
Note: Refer to Troubleshooting, "Component Location" of this manual, in order to locate the components listed in this procedure.In order to aid troubleshooting, overrides are provided via Cat ET.Overrides allow the technician to turn the circuit on and off at will.Refer to table 2 for the appropriate override for the code.
Table 2
J1939 and Component CDL and Component Override
3363
Aftertreatment #1 DEF Tank Heater 3606
Aftertreatment #1 DEF Tank Heater Relay Aftertreatment #1 SCR Catalyst Reagent Tank Heater Relay Override
4336
Aftertreatment #1 SCR Dosing Air Assist Valve 3094
Aftertreatment #1 SCR Dosing Air Assist Signal Aftertreatment #1 SCR Dosing Air Assist Valve Command Override
4354
Aftertreatment #1 DEF Line Heater #1 3110
Aftertreatment #1 DEF Line Heater #1 Aftertreatment #1 SCR Catalyst Reagent Line Heater #1 State Override
4355
Aftertreatment #1 DEF Line Heater #2 3111
Aftertreatment #1 DEF Line Heater #2 Aftertreatment #1 SCR Catalyst Reagent Line Heater #2 State Override
4357
Aftertreatment #1 DEF Line Heater #4 3604
Aftertreatment #1 DEF Manifold Heater Relay Aftertreatment #1 SCR Catalyst Reagent Manifold Heater Relay Override
4376
Aftertreatment #1 DEF Return Valve 3120
Aftertreatment #1 DEF Return Signal Aftertreatment #1 SCR Catalyst Reagent Return Valve Override
5435
Aftertreatment #1 DEF Pump State 3607
Aftertreatment #1 DEF Pump Heater Relay Aftertreatment #1 SCR Catalyst Pump Heater Command Percentage Override
5706
Aftertreatment #1 Diesel Exhaust Fluid Pump Heater 3607
Aftertreatment #1 DEF Pump Heater Relay Aftertreatment #1 SCR Catalyst Pump Heater Command Percentage Override Note: Some solenoid valve assemblies have a solenoid that can be serviced separately. The solenoid may be called out as a coil in the parts book.
Table 3
Troubleshooting Test Steps Values Results
1. Determine the Diagnostic Code
A. Establish communication between Caterpillar Electronic Technician (ET) and the applicable Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Look for an active or logged -5 code or -6 code.
Note: If a 4357-5 or -6 trips then remember that is the "DEF Manifold Heater Relay".
Diagnostic Trouble Codes
Result: A -5 code is present.
Proceed to Test Step 2.
Result: A -6 code is present.
Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit
A. Verify that the harness connector is free of debris, free of corrosion and sec