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. Check for current injector DTCs.
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
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:
  - P008A-00
  - P0088-00
  - P009C-00
  - P009D-00
  - P009E-00
  - P0191-00
  - P0192-00
  - P0193-00
  - P0252-00
  - P0253-00
  - P0254-00
  - P0686-00
  - P0687-00
  - P2540-00
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 3 .
CHECK HIGH-PRESSURE FUEL SYSTEM
1. Turn ignition switch ON and wait 30 seconds for lift pump to prime.
2. Check to see if engine starts.
  NOTE: It can be necessary to crank the engine for 30 seconds to prime the fuel system.
Is the inspection result normal?

YES

Inspection End.

NO

GO TO 4 .
CHECK FOR LEAKS IN THE HIGH-PRESSURE FUEL SYSTEM
1. Turn ignition switch OFF.
2. Start and idle the engine.
3. Using CONSULT, perform High-Pressure Fuel System Leakage test.
4. Wait 1 minute after test is performed and check the following for leaks or moisture.
  - Fuel rail supply line
  - Fuel rail to fuel rail supply line
  - Injector supply lines
Is the inspection result normal?

YES

GO TO 5 .

NO

Repair or replace error-detected parts.
CHECK THE FUEL PUMP ACTUATOR AND PRESSURE RELIEF VALVE
1. Turn ignition switch ON.
2. Using CONSULT, perform High-Pressure Fuel System Actuator Override test.
Are actuators within specifications?

YES

GO TO 6 .

NO

Repair or replace error-detected parts.
CHECK INJECTOR RETURN FLOW
1. Turn ignition switch ON.
2. Start and idle the engine.
3. Using CONSULT, perform High-Pressure Fuel Injector Return Flow test.
4. Wait 1 minute after test is performed and check the following for leaks or moisture.
  - Fuel rail supply line
  - Fuel rail to fuel rail supply line
  - Injector supply lines
Is injector return flow within specifications?

YES

Inspection End.

NO

Replace applicable fuel injectors. Refer to Exploded View .