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 FOR OTHER RELATED DIAGNOSTIC TROUBLE CODES
1. Turn ignition switch ON.
2. Connect CONSULT and check for the following current ENGINE diagnostic trouble codes:
  - U1611-00
  - P1613-00
  - P1614-00
  - P1623-00
Are any of the above DTCs current?

YES

Perform diagnosis of applicable DTC. Refer to DTC Index .

NO

GO TO 2 .
CHECK FOR INJECTOR MISFIRE
1. Start the engine and run it at low idle.
2. Determine if a cylinder misfire is noticed when the engine is running at low idle.
3. Using CONSULT, select "ENGINE" and perform the "Cylinder Cutout Test" Active Test to check for a cylinder misfire.
Was an engine misfire detected?

YES
- Replace malfunctioning 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) .
- Inspect the after treatment system for possible damage, and repair if necessary.
- GO TO 5 .
NO

GO TO 3 .
INSPECT TURBOCHARGER EXHAUST OUTLET FOR OIL OR FUEL
1. Turn ignition switch OFF.
2. Remove the exhaust plumbing from the turbocharger outlet.
3. Look for signs of moisture in the turbocharger exhaust outlet.
4. Inspect the turbocharger exhaust outlet for signs of oil or fuel being introduced into the after treatment system from the engine.
Was engine oil or fuel contamination found in the turbocharger exhaust outlet?

YES
- Locate the cause of possible diesel fuel or engine oil being carried from the engine into the after treatment system and repair or replace any components that caused the engine oil or diesel fuel contamination. Inspect the after treatment system for possible damage.
- GO TO 5 .
NO

GO TO 4 .
CHECK AFTER TREATMENT DIESEL OXIDATION CATALYST FOR SOOT ACCUMULATION
1. Remove the after treatment Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) assembly.
2. Inspect the after treatment DOC.
3. Check the intake face of the after treatment DOC for damage, soot accumulation and/or face plugging.
Are more than 50% of the cells on the intake face completely blocked by soot?

YES
- Replace the DOC and DPF assembly. Refer to Removal and Installation .
- GO TO 5 .
NO

GO TO 5 .
ERASE DTC
1. Connect all components.
2. With CONSULT, erase all DTCs.
3. Operate the engine within the conditions for setting DTC.
4. Check for current ENGINE diagnostic trouble codes.
Did the P244D-00 DTC return?

YES

Troubleshooting procedure needs to be repeated. Go to DTC Description .

NO

Repair complete.