Ford Focus 4F27E Harsh Garage Shifts - Transmission Digest

Ford Focus 4F27E Harsh Garage Shifts

Complaint:

A 2006 Ford Focus with the 4F27E Transmission has complaints of harsh garage shifts as well as harsh lift throttle coast downshifts. All upshifts are perfect and no trouble codes are stored.

An exchange valve body complete with solenoids did not eliminate the complaints. The Mass Airflow Sensor was cleaned and checked and the complaints remained.

Where to go from here came up once a pressure gauge was connected the line pressure service port. The technician noticed that whenever the brake was applied, line pressure became slightly elevated. This pointed the diagnostics towards the stop light switch and the stop light circuits.

Cause:

A poor stop light ground was found in the trunk. This required removal of the floor covering in the cargo area. These ground points are designated the G401 and G402 and are located across the rear of the cargo area, refer to figure 1.

Figure 1 – These ground points are designated the G401 and G402 and are located across the rear of the cargo area.

Correction:

Once the stop light ground was repaired all the harsh shift complaints vanished.

NOTE: There was no definitive cause as to why the poor stop light ground would have an effect on line pressure. It can only be assumed that the poor ground created a feedback situation through the inhibitor switch due to the stoplight circuit seeking a ground path and affecting the PCM control of the line pressure control system, but this is only a guess.

To view more technical video content from Precision International, click on the link: http://transmissionkits.com/videos

You May Also Like

GM 6T70/75 slips and delays in first

A 2015 Chevrolet Equinox equipped with the 3.6-liter engine and 6T75 transmission has complaints of a delayed engagement into drive and slips in first gear.

Tech-Talk-Q4-Figure-11-1400

The complaint

A 2015 Chevrolet Equinox equipped with the 3.6-liter engine and GM 6T75 transmission has complaints of a delayed engagement into drive and slips in first gear.

The cause

A generation one 1-2-3-4 Clutch Apply Piston was installed into a generation two transmission. The generation two 1-2-3-4 Clutch Apply Piston apply fingers are .147 in. taller than the generation one piston. This created too much clutch clearance for the clutch pack to effectively hold.

How to fix GM 6T70/Ford 6F50 rattling noise with transmission in gear

A rattling noise is coming from the transmission whenever the engine is running and the transmission is in gear.

Tech-Talk-Q4-Figure-13-1400
Mercedes-Benz 722.9 no forward movement after overhaul

The complaint A 2007 Mercedes-Benz CLS550 with the 722.9 transmission has an after-overhaul complaint of no forward movement. Related Articles – 6R80 whirring noise: TCC slip or engine surge? – The torque converter can of worms: Lockup and aftermarket programming – The Subaru mystery burn The cause The B2 Brake Housing inner apply piston was

Figure-9-10combo-1400
Land Rover LR3 ZF6HP26 no start after overhaul

The complaint A 2006 Land Rover LR3 equipped with the ZF6HP26 transmission has a post-overhaul complaint of a no-start condition. Part of the transmission overhaul process included the replacement of the mechatronic unit. Related Articles – Shift Pointers: Where’s that fluid leak coming from? – Multitasking: Sorting out multiple issues with the same vehicle –

Tech-Talk-Aug-Figure-8-1400
Infiniti G37 RE7R01A chassis codes set

The complaint A 2013 Infiniti G37 equipped with the RE7R01A transmission and the EXT13C transfer case has a complaint of trouble codes C1204 “4WD Solenoid Malfunction” and C1105 “Right Rear Wheel Speed Sensor Fault” stored. Due to extensive damage, the transfer case was replaced, which did not eliminate the stored codes. The shop then replaced

Tech-Talk-Aug-Figure-5-1400

Other Posts

Kitting keeps us profitable: Aftermarket kit suppliers listing 2024

The kitting of transmission parts has made profitable shop operation possible. When a kit with 100 parts is necessary, a distributor has already assembled all the important components into the kit and it is typically sitting on the shelf ready to be delivered. Kitting saves time and effort for both the shop and the supplying

Honda Accord BB7A six-speed: P2720 code set after collision

The complaint A 2015 Honda Accord with a 3.5-liter engine and the BB7A six-speed transmission (seen in figure 1, above), was involved in a minor collision to the left front of the vehicle. The vehicle was drivable and was taken to the transmission shop. Vehicle diagnostics revealed a P2720 “Pressure Control Solenoid D Voltage Low”

Tech-Talk-Aug-Figure-1-1400
42RLE buzzing noise on initial engagement

The complaint A 2005 Jeep Wrangler equipped with the 42RLE transmission had a buzzing noise when the shift selector was moved to the drive position. The vehicle was actually brought in with a shift complaint, at which time the owner of the vehicle also said that the buzzing noise was present since he purchased the

62TE delayed forward engagement

The complaint A 2016 Dodge Journey with the 62TE transmission had a complaint of delayed forward engagement and fluid leaking out of the vent when the transmission is placed in drive only. A code P0740 “Torque Converter Clutch Malfunction” was set. Related Articles – Sometimes, a diagnostic code is all you need – 10L80 and