31916-ZY3-003 Honda SPARK PLUG (IZFR6F11) (NGK) (Honda Code 6917652).

Table 1
Diagnostic Trouble Codes for the DEF Line Heaters
J1939 Code CDL Code Code Description Comments
4354-5 3110-5 Aftertreatment 1 Diesel Exhaust Fluid 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 suction line.
4354-6 3110-6 Aftertreatment 1 Diesel Exhaust Fluid 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 suction line.
4355-5 3111-5 Aftertreatment 1 Diesel Exhaust Fluid 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 return line.
4355-6 3111-6 Aftertreatment 1 Diesel Exhaust Fluid 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 return line.
4356-5 3112-5 Aftertreatment 1 Diesel Exhaust Fluid 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 pressure line to the DEF injector.
4356-6 3112-6 Aftertreatment 1 Diesel Exhaust Fluid 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 pressure line to the DEF injector.
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 g06233432
Schematic diagram of the DEF heater circuit
Illustration 2 g06208401
View of the pin locations for the DEF line heaters on the J1 ECM connector
(15) DEF return line heater #2 return
(16) DEF pressure line heater #3 supply
(23) DEF pressure line heater #3 return
(24) DEF suction line heater #1 supply
(39) DEF suction line heater #1 return
(73) DEF return line heater #2 supply
Illustration 3 g03128456
Heated DEF line connector
(1) DEF line heater supply
(2) DEF line heater 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 J1 ECM connector.
C. Inspect the connectors for the DEF line heaters.
D. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the line heaters.
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 7.
2. Determine the Diagnostic Code
A. Establish communication between the electronic service tool and the ECM.
B. Look for one of the codes that are listed in Table 1.
Diagnostic Trouble Codes
Result: There is an active or logged -5 diagnostic code for one or more of the DEF line heaters.
Proceed to Test Step 3.
Result: There is an active or logged -6 diagnostic code for one or more of the DEF line heaters.
Proceed to Test Step 5.
3. Create a Short Circuit at the DEF Line Heater Connector
A. Fabricate a jumper wire. Install the jumper wire between terminal 1 and terminal 2 on the harness connector for the suspect line heater.
B. Turn the keyswitch to the ON position.
C. Use the electronic service tool to perform the "DEF Heated Lines Test".
D. Monitor the active diagnostic codes on the electronic service tool. Check for a 435X-6 or 311X-6 diagnostic code.
Wait at least 30 seconds in order for the diagnostic codes to become active.
E. Use the electronic service tool to stop the "DEF Heated Lines Test".
F. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: The 435X-5 or 311X-5 diagnostic code is still active with the jumper installed.
Remove the jumper and proceed to Test Step 4.
Result: A 435X-6 or 311X-6 diagnostic code is active with the jumper installed.
Repair: Replace the suspect DEF line heater.
Proceed to Test Step 7.
4. Check the Wiring for an Open Circuit
A. Disconnect P1 at the ECM.
B. Check the resistance between terminal 2 on the harness connector for the suspect DEF line heater and the appropriate terminal on the P1 connector (harness side). Refer to Illustration 1.
Less than 2.0 Ohms
Result: The measured resistance is less than 2.0 Ohms.
Contact the Dealer Solutions Network (DSN).
Result: The measured resistance is more than 2.0 Ohms.
Repair: Replace the wiring between the suspect DEF line heater and the P1 connector on the ECM.
Proceed to Test Step 7.
5. Create an Open Circuit at the DEF Line Heater Connector
A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for 2 minutes to allow the DEF pump to purge, reset the code, and reset the ECM.
B. Disconnect the connector for the DEF line heater with the 435X-6 or 311X-6 diagnostic code.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to perform the "DEF Heated Lines Test".
E. Monitor the active diagnostic codes on the electronic service tool. Check for a 435X-5 or 311X-5 diagnostic code.
Wait at least 30 seconds in order for the diagnostic codes to become active.
F. Use the electronic service tool to stop the "DEF Heated Lines Test".
G. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: The 435X-6 or 311X-6 diagnosti