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 P204D-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. Connect a jumper wire between DEF supply pump assembly 5 volt supply terminal 13 and signal circuit terminal 12.
3. Wait for 1 minute.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Is DTC P204C-00 current and P204D-00 past?

YES

GO TO 10 .

NO

GO TO 5 .
INSPECT DEF CONTROL MODULE AND ELECTRICAL CONNECTIONS
1. Turn ignition 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 6 .

NO

Repair or replace error-detected parts.

CHECK TANK PRESSURE 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	24	C204	11	Yes

Is the inspection result normal?

YES

GO TO 7 .

Repair open circuit in harness or connectors.

CHECK TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR SHORT TO OTHER CIRCUITS

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

DEF control module			Continuity
Connector	Terminal	Terminal	Continuity
C205	25	All others	No

Is the inspection result normal?

YES

GO TO 8 .

Repair short circuit in harness or connectors.

CHECK TANK PRESSURE SENSOR POWER CIRCUIT FOR SHORT TO OTHER CIRCUITS

Check the continuity between DEF tank pressure sensor 5V supply and all other circuits at the DEF control module harness connector.

DEF control module			Continuity
Connector	Terminal	Terminal	Continuity
C205	27	All others	No

Is the inspection result normal?

YES

GO TO 9 .

Repair or replace harness for a short circuit.

CHECK THE DTC AND VERIFY SENSOR CONDITION
1. Reconnect all harness connectors.
2. Turn ignition switch ON and wait 30 seconds.
3. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Is P204D-00 DTC current?

YES

Replace DEF control module. Refer to Exploded View .

NO

The removal and installation of the connector corrected the issue.
CHECK FOR CURRENT DTC
1. Turn ignition OFF.
2. Remove the jumper wire.
3. Connect all components in the correct positions.
4. Turn ignition switch ON and wait 30 seconds.
5. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Is P204D-00 DTC current?

YES

Return to the diagnosis procedure steps. Refer to DTC Description .

NO

Repair complete.