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 DTC P056E-00 being current on the CONSULT screen.
Is DTC P056E-00 detected as current?

YES

GO TO 2 .

NO

Refer to Intermittent Incident .
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:
  - P0101-00
  - P0102-00
  - P0103-00
  - P0107-00
  - P0108-00
  - P012B-00
  - P012C-00
  - P012D-00
  - P0471-00
  - P2280-00
  - P2580-00
  - Any turbocharger, EGR bypass valve or EGR valve DTCs
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 3 .
CHECK DATA MONITOR
Check charge air cooler outlet pressure Data Monitor on the CONSULT screen.

Is the reading within ± 10.3 kPa (1.5 psi) of local barometric pressure?

YES

GO TO 4 .

NO

Replace engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .
INSPECT CHARGE AIR COOLER
1. Operate the engine.
2. Inspect the charge-air cooler for the following:
  - Leaks between the turbocharger compressor outlet and the charge-air cooler
  - Connections between the charge-air cooler and the intake manifold
  - intake manifold gasket for leaks
  - Hoses for leaks or loose connections
  - Clamps to make sure they are tight
  - Charge-air plumbing for cracks
Is the inspection result normal?

YES

GO TO 5 .

NO

Repair or replace error-detected parts.
INSPECT CHARGE AIR COOLER FOR RESTRICTION
1. Turn ignition switch OFF.
2. Inspect the charge-air cooler and piping for damages or obstructions to airflow.
Is the inspection result normal?

YES

GO TO 6 .

NO

Repair or replace error-detected parts.
INSPECT EGR SYSTEM FOR LEAKS AND RESTRICTIONS
1. Turn ignition switch OFF.
2. Inspect the EGR system plumbing for leaks and restrictions:
  - Check the exhaust transfer tubes for leaks and restrictions.
  - Check the exhaust bypass tubes for leaks and restrictions.
  - Leaks can be easily noted by traces of soot.
Is the inspection result normal?

YES

GO TO 7 .

NO

Repair or replace error-detected parts.
INSPECT AIR INTAKE FOR RESTRICTION
1. Connect all components.
2. Connect CONSULT and check for air intake restriction.
Is the inspection result normal?

YES

Inspection End.

NO

Repair or replace error-detected parts.