Interior - Buzz/Hum From Center/Right Side Dash Area
TSB 08-1-301/21/08
4.0L - PCM BRACKET BUZZ/HUM NOISE FROM
CENTER/RIGHT SIDE DASH AREA
FORD:
2006-2008 Explorer
2007-2008 Explorer Sport Trac
MERCURY:
2006-2008 Mountaineer
ISSUE
Some 2006-2008 Explorer, Mountaineer, and 2007-2008 Explorer Sport Trac vehicles equipped with a 4.0L engine may exhibit a buzz or hum noise from the center or right side of the instrument panel when at idle and/or between 1100-1400 RPM's while under light load. This may be due to the Powertrain Control Module (PCM) bracket vibrating resulting in the buzz/hum.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
Verify The Concern
1. Install wheel chocks.
2. Apply the parking brake.
3. Start the engine and shift to drive or reverse with the brake pedal applied.
4. Keeping the brake pedal applied, bring the engine speed up to 1100-1400 RPM's.
5. If the buzz/hum is present, have another technician stand on the right side of the vehicle and apply side load pressure to the outboard side of the PCM bracket.
a. If the noise can be turned on and off by applying side load pressure to the bracket, perform the Repair Procedure.
b. If the buzz/hum does not change when side load pressure is applied to the bracket, this TSB does not apply and follow normal Workshop Manual (WSM) diagnostics.
Repair Procedure
1. Remove the PCM from the bracket. (Refer to Workshop Manual, Section 303-14)
2. Cut a 1-3/16" X 2-3/8" (30 X 60 mm) piece of Urethane tape (164-R4902) from the Rotunda Squeak and Rattle Foam kit.
3. Install the foam to the outboard side of the bracket at the center of the rectangle opening so that it wraps to the inside sur[ace of the bracket. This will provide a load barrier once the PCM is reinstalled. (Figure 1)
4. Install the PCM. (Refer to WSM, Section 303-14)
5. Make sure the Heating Ventilation Air Conditioning (HVAC) case vacuum line is not touching the PCM or PCM bracket. Reroute as needed.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
080103A 2006-2008 0.5 Hr.
Explorer/Mountaineer
2007-2008 Explorer Sport
Trac: Install Foam To The
Outboard Side Of The
PCM Bracket, Includes
Time For Diagnosis And,
Remove And Install PCM
(Do Not Use With
12650D6)
DEALER CODING
CONDITION
BASIC PART NO. CODE
12A659 07
Disclaimer