Lincoln Navigator: Engine Cooling - 3.5L EcoBoost (272kW/370PS) / Cooling Fan Control. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Engine / Engine Cooling - 3.5L EcoBoost (272kW/370PS) / Cooling Fan Control. 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	P028D:00	Charge Air Cooler Cooling Fan Control Circuit Low: No Sub Type Information	GO to Pinpoint Test KF
PCM	P028E:00	Charge Air Cooler Cooling Fan Control Circuit High: No Sub Type Information	GO to Pinpoint Test KF
PCM	P0480:00	Fan 1 Control Circuit: No Sub Type Information	GO to Pinpoint Test KF
PCM	P0480:00	Fan 1 Control Circuit: No Sub Type Information	GO to Pinpoint Test KN
PCM	P0481:00	Fan 2 Control Circuit: No Sub Type Information	GO to Pinpoint Test KF
PCM	P0482:00	Fan 3 Control Circuit: No Sub Type Information	GO to Pinpoint Test KF

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 > Overheats > Always	GO to Pinpoint Test KF
Start/Run/Move > Running > Overheats > Always	GO to Pinpoint Test KN
Start/Run/Move > Running > Overheats > Intermittent	GO to Pinpoint Test KF
Start/Run/Move > Running > Overheats > Intermittent	GO to Pinpoint Test KN

Pinpoint Tests

PINPOINT TEST KF: FAN CONTROL RELAYS

Introduction

Normal Operation and Fault Conditions

Refer to the DTC Fault Trigger Conditions.

Although the PCM output circuits are called LFC, MFC, and HFC, cooling fan operation is controlled by a combination of these outputs.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P028D:00	Charge Air Cooler Cooling Fan Control Circuit Low: No Sub Type Information	Sets when the PCM detects an open circuit or a short to ground from the charge air cooler cooling fan circuit.
PCM P028E:00	Charge Air Cooler Cooling Fan Control Circuit High: No Sub Type Information	Sets when the PCM detects a short to voltage from the charge air cooler cooling fan circuit.
PCM P0480:00	Fan 1 Control Circuit: No Sub Type Information	Sets when the PCM detects excessive current draw from the low fan control circuit when activated; or voltage is not detected from the low fan control circuit when not activated. The PCM expects to detect vehicle power voltage coming through the low speed fan control relay coil to the low fan control circuit. When the LFC_F PID reads YES, a concern is present. A short to voltage can only be detected when the PCM is grounding the low fan control circuit.
PCM P0481:00	Fan 2 Control Circuit: No Sub Type Information	Sets when the PCM detects the high fan control output is commanded on (grounded) and excessive current draw is detected from the high fan control circuit; or when the high fan control circuit is commanded off and voltage is not detected from the high fan control circuit. The PCM expects to detect vehicle power voltage through the high speed fan control relay coil to the high fan control circuit. When the HFC_F PID reads YES, a concern is present. An open circuit or short to ground can only be detected when the PCM is not grounding the high fan control circuit. A short to voltage can only be detected when the PCM is grounding the high fan control circuit.
PCM P0482:00	Fan 3 Control Circuit: No Sub Type Information	Sets when the PCM detects the medium fan control output is commanded on (grounded) and excessive current draw is detected from the medium fan control circuit; or when the medium fan control circuit is commanded off and voltage is not detected from the medium fan control circuit. The PCM expects to detect vehicle power voltage through the medium speed fan control relay coil to the medium fan control circuit. When the HFC_F PID reads YES, a concern is present. An open circuit or short to ground can only be detected when the PCM is not grounding the high fan control circuit. A short to voltage can only be detected when the PCM is grounding the high fan control circuit.

Possible Sources

Fan control circurtity concern
Cooling fan module
Cooling fan clutch solenoid
Fan control relay
PCM (12A650)

PINPOINT TEST KN: VARIABLE SPEED ELECTRIC COOLING FAN MOTOR

Introduction
Refer to Wiring Diagrams Cell 024 for schematic and connector information.

Normal Operation and Fault Conditions

Refer to the DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0480:00	Fan 1 Control Circuit: No Sub Type Information	Sets if the PCM detects the voltage on the fan control variable (FCV) circuit is not within the expected range.

Possible Sources

Cooling fan circuitry concern
Cooling fan relay
Cooling fan clutch solenoid
Cooling fan module (8B658)
Cooling fan assembly (8C607)
PCM (12A650)

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This document provides critical diagnostic knowledge required for successful repair outcomes. It identifies technical competencies expected by users of this manual.

Ford Diagnostic Assumptions

Ford diagnostics assume the vehicle concern described by the test title is currently present. Exceptions to this rule are noted in each test. Do not replace modules or other components as directed by a diagnostic if the concern is not present at the time of testing.