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Home >> Ford >> 2018 >> Taurus Limited, FWD, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Electronic Power Assist Steering Component Testing) >> PSCM DTC/Symptom Selection >> Pinpoint Tests AC: Front End Noise - During Bumps, Rough Roads, Dips, Depressions, Entering A Driveway, Turning At Slow Speeds Or During Parking Lot Maneuvers

Pinpoint Tests AC: Front End Noise - During Bumps, Rough Roads, Dips, Depressions, Entering A Driveway, Turning At Slow Speeds Or During Parking Lot Maneuvers

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
  1. AC1: CHECK FOR NOISE AT FULL STEERING LOCK 
    NOTE: Holding the steering wheel at the full-lock position for longer than 30 seconds causes the PSCM to reduce steering assist to prevent damage to the EPAS gear.
    • Test drive the vehicle.
      • With the steering wheel at full lock (end of travel) to the left, attempt to recreate the customer concern.
      • With the steering wheel at full lock (end of travel) to the right, attempt to recreate the customer concern.
    • Is the noise condition present when turning at full lock? 
    Yes No
    Compare to a like vehicle. If similar, this is a normal condition - return the vehicle to the customer. Go to  AC2.
  2. AC2: INSPECTION FOR NOISE SOURCE 
    • Inspect the following components for a potential concern (loose, damaged, worn, broken, rubbing).
      • Springs, shocks, struts, strut bearings, bushings or jounce bumpers
      • Stabilizer bar links and isolators
      • Tires
      • Tie-rod ends
      • Upper and lower steering column shaft
      • Steering stops
      • Loose steering gear mounts or bolts
      • Front brake caliper, caliper pins or brake discs
      • Integrated front wheel ends (4x4 only)
      • Front control arm and bushings
      • Front halfshafts and bearings (if equipped)
      • Subframe or crossmember condition, mounts or fasteners
      • Engine or transmission mounts
      • Loose lower control arm-to-subframe bolts
      • Loose ball joint
      • Loose exhaust head shield, isolators or brackets
    • Are any of the listed parts worn, damaged or impaired? 
    Yes No
    INSTALL new or REPAIR the affected components.
    REFER to the appropriate service information.    		 Go to  AC3.
  3. AC3: VERIFY GENERAL NOISE LOCATION USING CHASSIS EARS (LEFT OR RIGHT SIDE OF VEHICLE) 
    • Using a listening device, such as Chassis Ears,
      • Install the listening device on the left and front strut towers.
      • Prepare the vehicle for a road test.
      • Using an assistant, attempt to duplicate the noise while listening to the device.
    • Is the noise louder on the left side? 
    Yes No
    Go to  AC4. If the right side is louder, Go to  AC5.
    If neither the left or the right side is louder, Go to  AC6.
  4. AC4: EVALUATION FOR LEFT SIDE NOISE 
    • Using a listening device, such as Chassis Ears:
    • Attach probe 1 to the left strut tower.
      • If loudest, inspect the strut tower area and attachments for looseness and wear.
    • Attach probe 2 to the left coil spring.
      • If loudest, inspect the upper strut bearing assembly for looseness and wear.
    • Attach probe 3 to the left lower control arm-to-subframe attachment point.
      • If loudest, inspect the control arm and bushings, subframe and bushings, sway bar bushings and links (common), and associated bolts for looseness, wear.
    • Attach probe 4 to the steering gear housing.
      • If loudest, inspect the inner and outer tie rods, mounting bushings, bolts and input shaft for looseness and wear. Place hands on steering shaft boot to verify if noise or vibration is transferring into steering gear (common). Verify whether other nearby components are transferring noise vibration into steering gear (common).
    • Using an assistant, test drive the vehicle and listen to the 4 probes.
    • Do any of these probes reveal the noise under consideration? 
    Yes No
    Referring to the possible noise source listed with each probe:
    If probe 1 is the loudest,
    REPAIR or INSTALL new components listed with probe 1 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 2 is the loudest,
    REPAIR or INSTALL new components listed with probe 2 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 3 is the loudest,
    REPAIR or INSTALL new components listed with probe 3 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 4 is the loudest,
    REPAIR or INSTALL new components listed with probe 4 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If all component inspections are OK and the steering gear is the primary noise source,
    INSTALL a new EPAS gear.
    REFER to appropriate Power Steering article.    		 If the noise is not revealed to be on the left side through the above 4 probes, RE-EVALUATE the noise condition with customer. If the noise is still not revealed to be on the left side, Go to  AC5.
  5. AC5: EVALUATION FOR RIGHT SIDE NOISE 
    • Using a listening device, such as Chassis Ears:
    • Attach probe 1 to the right strut tower.
      • If loudest, inspect the strut tower area and attachments for looseness and wear.
    • Attach probe 2 to the right coil spring.
      • If loudest, inspect the upper strut bearing assembly for looseness and wear.
    • Attach probe 3 to the right lower control arm-to-subframe attachment point.
      • If loudest, inspect the control arm and bushings, subframe and bushings, sway bar bushings and links (common), and associated bolts for looseness, wear.
    • Attach probe 4 to the steering gear housing.
      • If loudest, inspect the inner and outer tie rods, mounting bushings, bolts and input shaft for looseness and wear. Place hands on steering shaft boot to verify if noise or vibration is transferring into steering gear (common). Verify whether other nearby components are transferring noise vibration into steering gear (common).
    • Using an assistant, test drive the vehicle and listen to the 4 probes.
    • Do any of these probes reveal the noise under consideration? 
    Yes No
    Referring to the possible noise source listed with each probe:
    If probe 1 is the loudest,
    REPAIR or INSTALL new components listed with probe 1 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 2 is the loudest,
    REPAIR or INSTALL new components listed with probe 2 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 3 is the loudest,
    REPAIR or INSTALL new components listed with probe 3 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If probe 4 is the loudest,
    REPAIR or INSTALL new components listed with probe 4 as necessary. If the issue still exists,
    EVALUATE the next loudest probe channel.
    If all component inspections are OK and the steering gear is the primary noise source,
    INSTALL a new EPAS gear.
    REFER to appropriate Power Steering article.    		 If the noise is not revealed to be on the right side through the above 4 probes, RE-EVALUATE the noise condition with customer. If the noise is still not revealed to be on the right side, Go to  AC6.
  6. AC6: EVALUATION FOR NOISE IN CENTER 
Yes No
Referring to the possible noise source listed with each probe:
If probe 1 is the loudest,
REPAIR or INSTALL new components listed with probe 1 as necessary. If the issue still exists,
EVALUATE the next loudest probe channel.
If probe 2 is the loudest,
REPAIR or INSTALL new components listed with probe 2 as necessary. If the issue still exists,
EVALUATE the next loudest probe channel.
If probe 3 is the loudest,
REPAIR or INSTALL new components listed with probe 3 as necessary. If the issue still exists,
EVALUATE the next loudest probe channel.
If all component inspections are OK and the steering gear is the primary noise source,
INSTALL a new EPAS gear.
REFER to appropriate Power Steering article.		 If the noise is not revealed to be in the center area through the above 3 probes, RE-EVALUATE the noise condition with the customer or refer to appropriate Noise, Vibration and Harshness article NVH for further evaluation of the noise.
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