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 CURRENT DTC
1. Turn ignition switch ON.
2. Connect CONSULT and check "ENGINE" diagnostic trouble codes for DTC P208A-00 being current.
Is applicable DTC current?

YES

GO TO 2 .

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 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 3 .

NO

Repair or replace error-detected parts.
CHECK THE CIRCUIT RESPONSE
1. Connect a jumper wire between the DEF supply pump assembly connector pump motor A supply terminal 15 and motor B supply terminal 16 or motor C supply terminal 8.
2. Turn ignition switch ON.
3. Wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did DTC P208D-00 become current and P208A-00 become past?

YES

GO TO 4 .

NO

Replace the DEF control module. Refer to Removal and Installation .
INSPECT DEF CONTROL MODULE AND ELECTRICAL CONNECTIONS
1. Turn ignition switch OFF.
2. Disconnect the jumper wire.
3. Disconnect the DEF control module.
4. Inspect both connectors 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 5 .

NO

Repair or replace error-detected parts.

CHECK DEF SUPPLY PUMP MOTOR A SUPPLY CIRCUIT FOR OPEN

Check the pump motor A supply 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	19	C204	15	Yes

Is the inspection result normal?

YES

GO TO 6 .

Repair open circuit in harness or connectors.

CHECK DEF SUPPLY PUMP MOTOR B SUPPLY CIRCUIT FOR OPEN

Check the pump motor B supply 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	18	C204	16	Yes

Is the inspection result normal?

YES

GO TO 7 .

Repair open circuit in harness or connectors.

CHECK DEF SUPPLY PUMP MOTOR C SUPPLY CIRCUIT FOR OPEN

Check the pump motor C supply 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	17	C204	8	Yes

Is the inspection result normal?

YES

GO TO 8 .

Repair open circuit in harness or connectors.

CHECK DEF SUPPLY PUMP MOTOR GROUND CIRCUIT FOR OPEN

Check the pump motor 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	7	C204	7	Yes

Is the inspection result normal?

YES

GO TO 9 .

Repair open circuit in harness or connectors.

ERASE CURRENT DTC
1. Connect all harness connectors.
2. Turn ignition switch ON.
3. Using CONSULT, erase "ENGINE" diagnostic trouble codes.
4. Operate the engine within the "Conditions for clearing the DTC".
5. Using CONSULT, check for "ENGINE" diagnostic trouble codes.
Is P208A-00 DTC current?

YES

Return to Diagnosis Procedure. Refer to DTC Description .

NO

Repair complete.