19255-ZW5-000 Honda TUBE A, WATER (Honda Code 5891312).

Table 1
Diagnostic Trouble Codes for the DEF Line Heaters
J1939 Code CDL Code Code Description Comments
4354-5 3110-5 Aftertreatment #1 SCR Catalyst Reagent Line Heater #1 : Current Below Normal This code indicates that there is a fault in the #1 line heater circuit that is probably an open circuit. The #1 line heater is in the return line.
4354-6 3110-6 Aftertreatment #1 SCR Catalyst Reagent Line Heater #1 : Current Above Normal This code indicates that there is a fault in the #1 line heater circuit that is probably a short circuit. The #1 line heater is in the return line.
4354-12 3110-12 Aftertreatment #1 SCR Catalyst Reagent Line Heater #1 : Failure This code indicates that there is a fault in the #1 line heater circuit. The #1 line heater is in the return line.
4355-5 3111-5 Aftertreatment #1 SCR Catalyst Reagent Line Heater #2 : Current Below Normal This code indicates that there is a fault in the #2 line heater circuit that is probably an open circuit. The #2 line heater is in the pressure line to the DEF injector.
4355-6 3111-6 Aftertreatment #1 SCR Catalyst Reagent Line Heater #2 : Current Above Normal This code indicates that there is a fault in the #2 line heater circuit that is probably a short circuit. The #2 line heater is in the pressure line to the DEF injector.
4356-5 3112-5 Aftertreatment #1 SCR Catalyst Reagent Line Heater #3 : Current Below Normal This code indicates that there is a fault in the #3 line heater circuit that is probably an open circuit. The #3 line heater is in the suction line.
4356-6 3112-6 Aftertreatment #1 SCR Catalyst Reagent Line Heater #3 : Current Above Normal This code indicates that there is a fault in the #3 line heater circuit that is probably a short circuit. The #3 line heater is in the suction line.
5491-5 3822-5 Aftertreatment 1 Diesel Exhaust Fluid Line Heater Relay: Current Below Normal This code indicates that there is a fault in the line heater relay circuit that is probably an open circuit.
5491-6 3822-6 Aftertreatment 1 Diesel Exhaust Fluid Line Heater Relay: Current Above Normal This code indicates that there is a fault in the line heater relay circuit that is probably a short circuit.
Follow the troubleshooting procedure to identify the root cause of the fault. Note: Refer to Troubleshooting, "Sensors and Electrical Connectors"for the locations of the components listed in this procedure.
Illustration 1 g06006320
Schematic diagram of the DEF heater circuit
Illustration 2 g03126456
View of the pin locations for the DEF line heaters on the 86-pin (C1) connector
(1) DEF pressure line heater #2 return
(2) DEF return line heater #1 return
(48) DEF suction line heater #3 return
Illustration 3 g03126936
View of the pin locations for the DEF line heaters on the 53-pin (C2) connector
(30) DEF line heater relay supply
(41) DEF line heater relay return
Illustration 4 g03808796
DEF heater relay socket
(1) Battery supply
(2) Relay coil supply
(4) DEF line heater supply
(5) Relay coil return
Illustration 5 g03128456
Heated DEF line connector
(1) Battery +
(2) ReturnComplete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the C1 and C2 connectors.
C. Inspect the connectors for the DEF line heaters and the DEF line heater relay.
D. Perform a 45 N (10 lb) pull test on each of the wires in the DCU connector, the line heaters, and the line heater relay.
E. Check all the wiring associated with the DEF line heaters for abrasions and pinch points.
Damaged wire or connector
Result: A damaged wire or damaged connector was not found.
Proceed to Test Step 2.
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic codes. Proceed to Test Step 14.
2. Determine the Diagnostic Code
A. Establish communication between the electronic service tool and the engine ECM. If necessary, refer to Troubleshooting, "Electronic Service Tools".
B. Download the "Warranty Report" from the engine ECM before troubleshooting or clearing diagnostic trouble codes.
C. Establish communication between the electronic service tool and the DCU.
D. Look for one of the codes that are listed in Table 1.
Diagnostic Trouble Codes
Result: There is an active or logged 5491-5 or 3822-5 code.
Proceed to Test Step 3.
Result: There is an active or logged 5491-6 or 3822-6 code.
Proceed to Test Step 5.
Result: There is an active or logged 435x -5 or 311x-5 co