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 TEMPERATURE SENSOR DTC
Check for DTC P205D-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. Connect a jumper wire between the DEF supply pump assembly connector temperature SIGNAL terminal 9 and temperature ground terminal 10.
2. Turn ignition switch ON.
3. Wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did DTC P205C-00 become current and P205D-00 become past?

YES

GO TO 5 .

NO

GO TO 6 .
CHECK THE DTC AND VERIFY SENSOR CONDITION
1. Turn ignition switch OFF.
2. Remove the jumper wire.
3. Turn ignition switch ON.
4. Wait 30 seconds.
5. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did DTC P205D become current?

YES

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

NO

The removal and installation of the connector corrected the issue. Repair complete.
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 OPEN

Check the signal circuit for continuity between the DEF control module and the DEF supply pump assembly.

DEF control module		DEF supply pump assembly		Continuity
Connector	Terminal	Connector	Terminal	Continuity
C205	21	C204	9	Yes

Is the inspection result normal?

YES

GO TO 8 .

Repair open circuit in harness or connectors.

CHECK TANK TEMPERATRE SENSOR GROUND CIRCUIT FOR OPEN

Check the ground circuit for continuity between the DEF control module and the DEF supply pump assembly.

DEF control module		DEF supply pump assembly		Continuity
Connector	Terminal	Connector	Terminal	Continuity
C205	29	C204	10	Yes

Is the inspection result normal?

YES

GO TO 9 .

Repair open circuit in harness or connectors.

CHECK TANK TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO OTHER CIRCUITS

Check the 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 10 .

Repair short circuit in harness or connectors.

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 P205D-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.