Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OTHER RELATED DIAGNOSTIC TROUBLE CODES
1. Turn ignition switch ON.
2. Connect CONSULT and check for the following current "ENGINE" diagnostic trouble codes:
  - P202B-00
  - P202C
  - P205C-00
  - P205D-00
  - P205E-00
Are any of the above DTCs detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 2 .
CHECK FOR LOW DEF TANK LEVEL
1. Make sure the DEF tank is not empty and the tank level gauge is accurate.
2. .Check for P203F-00 being a current ENGINE diagnostic trouble code:
Is the above DTC detected?

YES

Fill the DEF tank.

NO

GO TO 3 .
CHECK FOR CURRENT TANK HEATER DTC
Check for DTC P209F-00 being current on the CONSULT screen.

Is applicable DTC current?

YES

GO TO 4 .

NO

Refer to Intermittent Incident .

INSPECT DEF TANK HEATER SUPPLY CIRCUIT FOR OPEN

Turn ignition switch OFF.
Disconnect the DEF control module.
Disconnect the DEF supply pump assembly.
Check the DEF tank heater power supply circuit for continuity between the DEF supply pump assembly and the DEF control module.

DEF supply pump assembly		DEF control module		Continuity
Connector	Terminal	Connector	Terminal	Continuity
C204	1	C205	22	Yes

Is the inspection result normal?

YES

GO TO 5 .

Repair open power supply circuit in harness or connectors.

INSPECT DEF TANK HEATER RETURN CIRCUIT FOR OPEN

Check the DEF tank heater return circuit for continuity between the DEF supply pump assembly and the DEF control module.

DEF supply pump assembly		DEF control module		Continuity
Connector	Terminal	Connector	Terminal	Continuity
C204	3	C205	23	Yes

Is the inspection result normal?

YES

GO TO 6 .

Repair open return circuit in harness or connectors.

VERIFY PROPER OPERATION OF THE DEF TANK HEATER
1. Connect all harness connectors.
2. Turn ignition switch ON.
3. Connect CONSULT and select "ENGINE" then perform the "DEF Tank Heater Test".
4. Using the CONSULT, monitor the DEF tank temperature " UREA TANK TEMP".
5. Allow the DEF tank temperature 3 to 5 minutes to rise.
Did the DEF tank temperature rise?

YES

GO TO 7 .

NO

Replace the DEF supply pump assembly. Refer to Removal and Installation .
ERASE CURRENT DTC
1. Using CONSULT erase "ENGINE" diagnostic trouble codes.
2. Operate the engine within the "Conditions for setting the DTC".
3. Check for ENGINE diagnostic trouble codes.
Is P209F-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.