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 DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for other existing "ENGINE" diagnostic trouble codes.
If DTC P21CA-00 is present, perform the confirmation procedure (trouble diagnosis) for this other DTC first.

Is applicable DTC detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Description .

NO

GO TO 2 .
CHECK FOR CURRENT DEF PRESSURE SENSOR DTC
Check for DTC P205C-00 current on the CONSULT screen.

Is applicable DTC current?

YES

GO TO 3 .

NO

Refer to Intermittent Incident .
INSPECT DEF SUPPLY PUMP ASSEMBLY AND ELECTRICAL CONNECTIONS
1. Turn ignition switch OFF.
2. Disconnect the DEF supply pump assembly connector.
3. Inspect connector and pins for the following:
  - Loose connector.
  - Corroded pins.
  - Bent or broken pins.
  - Pushed back or expanded pins.
  - Moisture in or on the connector.
  - Missing or damaged connector seals.
  - Dirt or debris on or in the connector pins.
  - Connector shell broken.
  - Wire insulation damage.
  - Damaged connector locking tab.
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch ON.
2. Wait 30 seconds.
3. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did DTC P205D-00 become current and P205C-00 become past?

YES

GO TO 5 .

NO

GO TO 6 .
CHECK FOR CURRENT DTC
1. Turn ignition switch OFF.
2. Connect all harness connectors.
3. Turn ignition switch ON and wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Is P205C-00 DTC current?

YES

Replace the DEF supply pump assembly. Refer to Exploded View .

NO

The removal and installation of the connector corrected the issue.
INSPECT DEF CONTROL MODULE AND ELECTRICAL CONNECTIONS
1. Turn ignition switch OFF.
2. Disconnect the DEF control module.
3. Inspect both connectors and pins for the following:
  - Loose connector.
  - Corroded pins.
  - Bent or broken pins.
  - Pushed back or expanded pins.
  - Moisture in or on the connector.
  - Missing or damaged connector seals.
  - Dirt or debris on or in the connector pins.
  - Connector shell broken.
  - Wire insulation damage.
  - Damaged connector locking tab.
Is the inspection result normal?

YES

GO TO 7 .

NO

Repair or replace error-detected parts.

CHECK TANK TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO OTHER CIRCUITS

Check for continuity between DEF tank temperature sensor signal and all other circuits at the DEF control module harness connector.

DEF control module			Continuity
Connector	Terminal	Terminal	Continuity
C205	21	All others	No

Is the inspection result normal?

YES

GO TO 8 .

Repair short circuit in harness or connectors.

CHECK TANK TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND

Check for continuity between DEF tank temperature sensor signal circuit and ground.

DEF control module		Ground	Continuity
Connector	Terminal
C205	21	-	No

Is the inspection result normal?

YES

GO TO 9 .

Repair or replace harness for a short to ground.

CHECK FOR CURRENT DTC
1. Connect all harness connectors.
2. Start the engine and let it idle for 1 minute.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Using CONSULT check for current "ENGINE" diagnostic trouble codes.
Is P205C-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.