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 ENGINE diagnostic trouble codes.
3. Are any of the following displayed as current or have high past counts on the CONSULT screen.
  - P00C6-00
  - P0461-00
  - P0462-00
  - P0463-00
  - P0562-00
  - P0563-00
  - P0628-00
  - P0629-00
  - P2540-00
  - P2541-00
  - P2542-00
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
VERIFY FUEL LEVEL
1. Turn ignition switch ON.
2. Turn ignition switch OFF.
3. Verify there is fuel in the tank.
  NOTE: Do not rely on the fuel gauge. Check the actual tank level.
Is the inspection result normal?

YES

GO TO 3 .

NO

Add fuel to the tank.

CHECK THE LIFT PUMP VOLTAGE

Turn ignition switch OFF.
Disconnect the lift pump harness connector F226.
Turn ignition switch ON.

Measure the voltage between lift pump harness connector F226 terminals 1 and 2, while cranking the engine.

Lift pump

Condition

Voltage

(Approx.)

Connector

Terminal

F226

Engine cranking

> 8V

Is inspection result normal?

YES

GO TO 4.

Check lift pump relay and lift pump harness. Repair or replace if necessary.

CHECK THE FUEL FILTERS
Check fuel filters for restriction.

Is the inspection result normal?

YES

GO TO 5 .

NO

Replace stage 1 and 2 fuel filters. Refer to Removal and Installation and Removal and Installation . To inspect the filters, refer to Inspection .
CHECK FOR AIR IN THE FUEL
Check for air in the fuel system.

Is the inspection result normal?

YES

GO TO 6 .

NO

Remove air from the fuel system. Repair or replace error-detected parts. Refer to Low Pressure System Check .
CHECK FOR FUEL INLET RESTRICTION
1. Check the fuel lines to the tank for proper size, leaks, bends, or clogs.
2. Check the fuel tank vents for plugging.
Is the inspection result normal?

YES

GO TO 7 .

NO

Repair or replace error-detected parts. Refer to Inspection .
INSPECT FUEL SUPPLY LINES
Check suction and pressure side fuel supply lines for leaks or damage.

Is the inspection result normal?

YES
- Replace the lift pump. Refer to Removal and Installation .
- GO TO 8 .
NO

Replace fuel supply line.
CHECK DTC PRIORITY
1. Connect all components.
2. Operate the vehicle according to the DTC CONFIRMATION PROCEDURE.
DTC P008A-00 current?

YES

Replace stage 2 fuel filter housing. Refer to Removal and Installation .

NO

Repair End.