Symptom Chart

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

In most circumstances, the PCM sets DTCs to help guide with diagnostics. Refer to the DTC Chart: Transfer Case Control Module (TCCM) before using the symptom chart. The Symptom column lists the vehicle condition. The Possible Sources column lists a detailed vehicle condition. The Action column lists the action to be performed to determine the cause of the condition. Each action lists the components that can cause the system and the individual components in that system. The components are listed in order of disassembly. Use the list of components and the required action to focus on disassembly inspections for the root cause of the concern.

Four-Wheel Drive (4WD) System

Symptom	Possible Sources	Action
No communication with the TCCM	Scan tool DLC TCCM Wiring, terminals or connectors	REFER to: Communications Network .
The shift motor does not operate correctly	Wiring, terminals or connectors Transfer case TCCM Shift motor	GO to Pinpoint Test L
Unable to duplicate customer concern	4WD system and/or related components	GO to Pinpoint Test F
Unable to achieve flat tow (neutral tow) mode	Wiring, terminals or connectors HS-CAN IPC TCCM Door ajar switch Ignition switch	REFER to: Neutral Flat Tow Activation and Deactivation .