Symptom Chart
WARNING: This page is about a different car, the 2018 Ford Edge. 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 a DTC to help guide with diagnostics. Refer to the DTC Chart before using the Symptom Chart. The Condition 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.
| Symptom | Possible Sources | Action |
|---|---|---|
| Odor from PTU - may be described as propane or natural gas type of odor. | Overheated PTU Fluid from Idler Bearing walk | REMOVE the PTU. REFER to: Transfer Case . DISASSEMBLE the PTU and INSPECT for damage caused by the idler shaft bearing. REFER to: Transfer Case . INSTALL Idler Shaft Bearing Repair Kit as necessary. REFER to: Install Idler Shaft Bearing Repair Kit . |
| The power transfer unit makes noise | Tire inflation pressure Tire and wheel size Fluid level Idler Bearing walk |
MAKE SURE all tires and wheels are the same size and brand and the inflation pressures are correct. FILL with the correct type and amount of lubricant. REMOVE the PTU. REFER to: Transfer Case . DISASSEMBLE the PTU and INSPECT for damage caused by the idler shaft bearing. REFER to: Transfer Case . INSTALL Idler Shaft Bearing Repair Kit as necessary. REFER to: Install Idler Shaft Bearing Repair Kit . |
| Leaking fluid from the power transfer unit vent | Power transfer unit is over filled PTU Overheat from Idler Bearing walk PTU overfilled and transmission fluid is low. PTU vent hose is disconnected or missing. |
VERIFY fluid level. REFER to: Transfer Case Fluid Level Check . REMOVE the PTU. REFER to: Transfer Case . DISASSEMBLE the PTU and INSPECT for damage caused by the idler shaft bearing. REFER to: Transfer Case . INSTALL Idler Shaft Bearing Repair Kit as necessary. REFER to: Install Idler Shaft Bearing Repair Kit . INSTALL new input seals, new compression seal, intermediate shaft seal, deflector, and alignment washer. REFER to: Transfer Case Input Shaft Seal . and REFER to: Intermediate Shaft Seal . . DRAIN and REFILL the PTU. REFER to: Transfer Case Draining and Filling . CONNECT the PTU vent hose or INSTALL a new PTU vent hose as necessary. |
| Leaking automatic transmission fluid | Power transfer unit intermediate shaft seal Power transfer unit compression seal |
REFER to Analysis of Leakage . |
| Leaking gear lubricant from the seals | The power transfer unit vent is plugged (located on top of the power transfer unit) Damaged seals |
INSTALL a new the power transfer unit vent tube. REPLACE the leaking seal. REFER to: Transfer Case Input Shaft Seal . REFER to: Transfer Case Rear Seal . REFER to: Intermediate Shaft Seal . |
| Vehicle has no or inadequate torque at rear wheels | Rear axle Power transfer unit mechanical failure |
REFER to: Rear Drive Axle and Differential
. REFER to: Transfer Case . |
| Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line | Wheels/tires Brake system Wheel bearings Halfshafts ABS system |
REFER to: Wheels and Tires
. REFER to: Brake System . REFER to: Suspension System . REFER to: Front Drive Halfshafts . REFER to: Anti-Lock Brake System (ABS) and Stability Control . |
| Loss of AWD function or partial AWD function | Power transfer unit overheating | INSPECT the duct that cools the power transfer unit sump is free and clear of debris. |