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 do they have high past counts on the CONSULT screen:
  - P0102-00
  - P0103-00
  - P0104-00
  - P0106-00
  - P0107-00
  - P0108-00
  - P012B-00
  - P012C-00
  - P012D-00
  - P0299-00
  - P0471-00
  - P2280-00
  - P2580-00
  - Any turbocharger DTCs
  - Any EGR bypass DTCs
  - Any EGR valve DTCs
Is applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
CHECK DATA MONITOR
Check charge air cooler outlet pressure Data Monitor item on the CONSULT screen.

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

YES

GO TO 3 .

NO

Replace the engine charge air cooler outlet pressure/temperature sensor. Refer to Removal and Installation .
CHECK EGR SYSTEM FOR LEAKS AND RESTRICTION
1. Turn ignition switch OFF.
2. Check the EGR system plumbing for leaks and restrictions:
  NOTE: Leaks can be easily noted by traces of soot.
  - Check the exhaust transfer tubes for leaks and restrictions.
  - Check the exhaust bypass tubes for leaks and restrictions.
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.
CHECK EGR VALVE FOR RESTRICTION
Check the EGR valve for restrictions.

Is the inspection result normal?

YES

GO TO 5 .

NO

Repair or replace the EGR valve. Refer to Removal and Installation .
CHECK EGR COOLER FOR RESTRICTION
Check the EGR cooler for restrictions.

Is the inspection result normal?

YES

GO TO 6 .

NO

Repair or replace the EGR cooler. Refer to Removal and Installation .
CHECK CHARGE-AIR COOLER AND CHARGE-AIR PLUMBING FOR LEAKS
1. Start the engine.
2. Check the charge-air cooler and charge-air plumbing for leaks.
  - Check the charge-air cooler connections for leaks between the turbocharger compressor outlet and the charge-air cooler.
  - Check the charge-air cooler connections between the charge-air cooler and the intake manifold.
  - Inspect the intake manifold gasket for leaks.
  - Inspect the charge-air cooler hoses for leaks or loose connections. Check the Exhaust bypass tubes for leaks and restrictions.
  - Inspect the charge-air cooler clamps to make sure they are tight.
  - Inspect the charge-air plumbing for cracks.
Is the inspection result normal?

YES

GO TO 7 .

NO

Repair or replace error-detected parts.
CHECK FOR AIR INTAKE RESTRICTION
Check for air intake restriction.

Is the inspection result normal?

YES

Inspection End.

NO

Repair or replace error-detected parts.