Lincoln Navigator: Exhaust System - 3.5L EcoBoost (272kW/370PS) / Catalyst System. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Exhaust System / Exhaust System - 3.5L EcoBoost (272kW/370PS) / Catalyst System. Diagnosis and Testing

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Module	DTC	Description	Action
PCM	P0420:00	Catalyst System Efficiency Below Threshold (Bank 1): No Sub Type Information	GO to Pinpoint Test HF
PCM	P0430:00	Catalyst System Efficiency Below Threshold (Bank 2): No Sub Type Information	GO to Pinpoint Test HF

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom	Action
Start/Run/Move > Running > Failed Emissions Testing > Catalyst	GO to Pinpoint Test EM
Start/Run/Move > Odor > Chemical > Always	GO to Pinpoint Test HF

Pinpoint Tests

PINPOINT TEST EM: EMISSION COMPLIANCE

Introduction

NOTE: Canada and some states or metropolitan areas in the United States require periodic emission, or inspection/maintenance tests. All Ford products are designed to pass these tests. If a Ford product fails the test, the most likely causes are:

The engine or catalyst temperature are not warm and stabilized before the test.
Excessive idling by the vehicle before the test.

Normal Operation and Fault Conditions

If any new emission components are installed, carry out the following steps before repeating the inspection/maintenance test procedure:

Reset the KAM . Refer to Resetting The KAM .
To relearn some basic adaptive learning (trim) values, run the engine at 2,500 RPM for 1 minute and idle the engine for 2 minutes.

Verifying an excessive grams per mile (gpm) indication using a parts per million (ppm) reading.

For excessive vehicle gas readings, compare the actual gpm reading to the gas cutpoint level needed to pass testing. This gives an indication of how much the ppm reading has to be reduced (if the actual reading is twice the cutpoint, the baseline reading has to be cut in half or more).

Example:

The actual HC produced by a vehicle is 1.6 gpm. The cutpoint for HC in this example is 0.8 gpm. The actual reading is twice the cutpoint.
The HC reading obtained for the same vehicle during the baseline drive averages 440 ppm. In order for this vehicle to pass the inspection/maintenance test, the HC reading from the verification trip must be at least half of the baseline reading, or an average of 220 ppm or less.
This method only gives a general idea of how much the ppm reading needs to be reduced in order for the vehicle to pass an inspection/maintenance test that calculates gpm. This test is not exact. Experience still has to be used to determine if the emission readings are reduced enough for the vehicle to pass the inspection/maintenance test.

Possible Sources

Intake air system concern
Exhaust system concern
Fuel system concern
Ignition system concern

PINPOINT TEST HF: CATALYST EFFICIENCY MONITOR AND EXHAUST SYSTEMS

Introduction

Normal Operation and Fault Conditions

Refer to the DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0420:00	Catalyst System Efficiency Below Threshold (Bank 1): No Sub Type Information	Sets when PCM detects the bank 1 catalyst system efficiency is below the acceptable threshold. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage capability. As catalyst efficiency deteriorates, its ability to store oxygen declines. Refer to the Catalyst Efficiency Monitor description for additional information. Diagnose any base engine concerns. Refer to the appropriate 303-00 section, Engine System.
PCM P0430:00	Catalyst System Efficiency Below Threshold (Bank 2): No Sub Type Information	Sets when PCM detects the bank 2 catalyst system efficiency is below the acceptable threshold. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage capability. As catalyst efficiency deteriorates, its ability to store oxygen declines. Refer to the Catalyst Efficiency Monitor description for additional information. Diagnose any base engine concerns. Refer to the appropriate 303-00 section, Engine System.

Possible Sources

HO2S 2WD 4WD circuitry concern
Exhaust system concern
Contaminated oil
Base engine concern
Fuel injector
Turbocharger
HO2S

Exhaust System - System Operation and Component Description. Description and Operation

System Operation Catalyst And Exhaust Systems The catalytic converter and exhaust systems work together to control the release of harmful engine exhaust emissions into the atmosphere...

Exhaust System. Diagnosis and Testing

Symptom Chart(s) Symptom Chart: Symptom Chart - Exhaust System Verify the customer concern. Inspect the components of the exhaust system for obvious signs of damage or other mechanical concerns using the following chart...

Other information:

Lincoln Navigator 2018-2025 Workshop Manual: Powertrain Control Module (PCM). Removal and Installation

Special Tool(s) / General Equipment Ford Diagnostic Equipment Removal NOTE: Removal steps in this procedure may contain installation details. If installing a new PCM , connect a battery charger to the battery to make sure it is charged to maintain proper battery voltage...

Lincoln Navigator 2018-2025 Workshop Manual: Starter Motor. Removal and Installation

Removal WARNING: Always disconnect the battery ground cable at the battery before disconnecting the starter motor battery terminal lead. If a tool is shorted at the starter motor battery terminal, the tool can quickly heat enough to cause a skin burn...

Wheel to Hub Runout Minimization. General Procedures

Check

NOTE: Wheel-to-hub optimization is important. Clearance between the wheel and hub can be used to offset or neutralize the Road Force® or run-out of the wheel and tire assembly. For every 0.001 inch of wheel-to-hub clearance, the Road Force® can be affected between 1 and 3 pounds depending on the tire stiffness.

NOTE: The example below illustrates how the clearance between the wheel and the hub can be used to offset the high spot of radial run-out or Road Force®. Following the procedure will make sure of the best optimization.

Position the wheel and tire assembly on the vehicle so that the high spot location of radial run-out or Road Force® is at the 6 o'clock position and