The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).
Symptom Chart: NVH
Symptom Chart
Condition
Action
Transmission clunk - loud clunk when shifting from REVERSE to DRIVE.
GO to Pinpoint Test A
Transmission shudder - occurs when the vehicle begins to move forward from a stop.
GO to Pinpoint Test B
Judder - judder is the same during cruise or coast/deceleration.
GO to Pinpoint Test C
Thump or boom - noise occurs on coast/deceleration, usually related to driveshaft rotational speed and noticeable over a wide speed range.
GO to Pinpoint Test D
Grunt - usually associated with driveline shuck experienced during acceleration from a complete stop.
GO to Pinpoint Test E
Driveline shudder - occurs during low speed acceleration or stopping.
GO to Pinpoint Test F
Transmission vibration - occurs at cruising speeds.
GO to Pinpoint Test G
Global Customer Symptom Codes (GCSC) Table
The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).
DIAGNOSTIC TEST A: TRANSMISSION SHUDDER - SEVERE SHUDDER ON REVERSE TO DRIVE SHIFT
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Damaged or worn driveshaft U-joint
A1 CHECK THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINT FOR WEAR OR DAMAGE
Inspect the driveshaft joints for wear or damage.
Was any damage found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST B: TRANSMISSION SHUDDER - OCCURS WHEN VEHICLE BEGINS TO MOVE FORWARD FROM A STOP
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Worn driveshaft CV joint with excessive play
B1 CHECK THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINT FOR WORN CONDITION
Inspect the driveshaft CV joint for wear.
Was any damage found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST C: JUDDER - JUDDERING NOISE THE SAME AT CRUISE OR COAST/DECELERATION
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Incorrect driveline angles
C1 CHECK THE DRIVELINE ANGLES
Check the driveline angles.
Are the driveline angles incorrect?
Yes
Repair as necessary. REFER TO: Driveline Angle Measurement (205-01 Driveshaft, General Procedures).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST D: THUMP OR BOOM - NOISE OCCURS ON COAST/DECELERATION, DRIVESHAFT USUALLY SPEED-RELATED AND NOTICEABLE OVER A WIDE SPEED RANGE
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Driveshaft out of balance
D1 CHECK THE DRIVESHAFT FOR DAMAGE, MISSING WEIGHTS OR UNDERCOATING
Check the driveshaft for damage, missing balance weights or undercoating.
Was the driveshaft damaged or out of balance?
Yes
Repair as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation). REFER TO: Driveshaft Runout and Balance (205-01 Driveshaft, General Procedures).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST E: GRUNT, USUALLY ASSOCIATED WITH DRIVELINE SHUCK, EXPERIENCED DURING ACCELERATION FROM A COMPLETE STOP
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Driveshaft CV joint binding
E1 CHECK THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINT FOR BINDING
Inspect the driveshaft CV joint for binding.
Is driveshaft CV joint binding found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST F: DRIVELINE SHUDDER - OCCURS DURING LOW SPEED ACCELERATION OR STOPPING
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Driveline angles do not meet specification
Binding or damaged driveshaft CV joint
F1 CHECK THE DRIVELINE ANGLES
Check the driveline angles.
Are the driveline angles incorrect?
Yes
Repair as necessary. REFER TO: Driveline Angle Measurement (205-01 Driveshaft, General Procedures).
No
Inspect the vehicle for other symptoms related to the driveshaft.
F2 CHECK THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINTS AND INTERMEDIATE SHAFT FOR WEAR OR DAMAGE
Inspect the driveshaft joints and the intermediate shaft for wear or damage.
Was wear or damage found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
Inspect the vehicle for other symptoms related to the driveshaft.
DIAGNOSTIC TEST G: DRIVESHAFT VIBRATION - OCCURS AT CLUNK SPEED
Normal Operation and Fault Symptoms
The drivetrain system generates power with the engine and transmits it through the transmission and, if equipped, the transfer case, to propel the vehicle. Rotational torque from the transmission or transfer case is delivered to the front and rear axles through the driveshafts. Universal joints (U-joints) at the ends of the shafts allow the shafts to rotate smoothly through the permissible angle range. Torque is input to the interaxle differential, which drives the axle shafts.
Possible Sources
Worn or damaged driveshaft center bearing support.
Center bearing bolts incorrectly installed
Axle pinion flange bolts loose
Excessive axle pinion flange runout
Driveshaft out of balance
Binding or damaged driveshaft CV joint
Excessive driveshaft runout
Driveline angles do not meet specification
G1 CHECK THE DRIVESHAFT CENTER BEARING INSULATOR FOR DAMAGE OR WEAR
Check the driveshaft center bearing insulator for damage or wear.
Rotate the driveshaft and check for rough operation.
Was wear or damage found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
GO to G2
G2 CHECK FOR LOOSE AXLE PINION FLANGE BOLTS
Check for loose axle pinion flange bolts.
Are any bolts loose?
Yes
Tighten to specification. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
GO to G3
G3 CHECK THE AXLE PINION FLANGE RUNOUT
Check the axle pinion flange runout.
Is the runout within specification?
Yes
Inspect the vehicle for other symptoms related to the driveshaft.
No
Perform the runout check and repair as necessary. REFER TO: Driveshaft Runout and Balance (205-01 Driveshaft, General Procedures).
G4 CHECK THE DRIVESHAFT FOR DAMAGE, MISSING WEIGHTS OR UNDERCOATING
Check the driveshaft for damage, missing balance weights or undercoating.
Check the driveshaft balance.
Was a system fault found?
Yes
REFER TO: Driveshaft Runout and Balance (205-01 Driveshaft, General Procedures).
No
GO to G5
G5 CHECK THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINTS FOR WEAR OR DAMAGE
Inspect the driveshaft joints for wear or damage.
Was wear or damage found?
Yes
Install a new driveshaft as necessary. REFER TO: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
No
GO to G6
G6 CHECK THE DRIVESHAFT RUNOUT
Check the driveshaft runout.
Is the runout within specification?
Yes
Inspect the vehicle for other symptoms related to the driveshaft.
No
Perform the runout check. REFER TO: Driveshaft Runout and Balance (205-01 Driveshaft, General Procedures).
G7 CHECK THE DRIVELINE ANGLES
Check the driveline angles.
Are the driveline angles incorrect?
Yes
Repair as necessary. REFER TO: Driveline Angle Measurement (205-01 Driveshaft, General Procedures).
No
Inspect the vehicle for other symptoms related to the driveshaft.
?
Test yourself
A quick Ford Escape quiz: every answer comes with an explanation and a link to the manual page.
DIAGNOSTIC TEST A: TRANSMISSION SHUDDER - SEVERE SHUDDER ON REVERSE TO DRIVE SHIFT