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 DTCs U1611-00, P1613-00, P1614-00 or P1623-00 being current on the CONSULT screen.
Is any applicable DTC detected?

YES

Refer to DTC Index .

NO

GO TO 2 .
PERFORM ACTIVE TEST
1. Start the engine and run at low idle.
2. Perform the cylinder cutout "Active Test" using CONSULT.
Was engine misfire detected?

YES

Determine the cause of misfire. Replace the injector, if necessary. Refer to (cylinder 1 or 3) Removal and Installation (CYLINDER 1 and CYLINDER 3) , (cylinder 2 or 4) Removal and Installation (CYLINDER 2 and CYLINDER 4) , (cylinder 5 or 7) Removal and Installation (CYLINDER 5 and CYLINDER 7) , (cylinder 6 or 8) Removal and Installation (CYLINDER 6 and CYLINDER 8) .

NO

GO TO 3 .
CHECK TURBOCHARGER OUTLET
1. Turn ignition switch OFF.
2. Remove the exhaust plumbing from the turbocharger outlet.
3. Inspect the turbocharger outlet for signs of oil or fuel being introduced into the aftertreatment system from the engine.
Is there engine oil or fuel contamination in the turbocharger exhaust outlet?

YES

Repair or replace any components that caused the engine oil or diesel fuel contamination.

NO

GO TO 4 .
CHECK AFTERTREATMENT DIESEL OXIDATION CATALYST
1. Remove the aftertreatment DPF assembly.
2. Inspect the intake face of the aftertreatment diesel oxidation catalyst for damage, soot accumulation or face plugging.
Is more than 50 % of the cells on the intake face completely blocked by soot?

YES

Replace the aftertreatment DPF assembly.

NO

Refer to Intermittent Incident .