KIA A6MF2H Hybrid Engine Stalls in Drive
Complaint: A 2012 Kia Optima Hybrid equipped with a 2.4L engine and the A6MF2H transmission has a complaint of the engine stalling as soon as the shifter is pulled into the drive position. When the transmission was disassembled for inspection, the engine clutch friction plates were found to be burnt and welded together, refer to
Hyundai/KIA A5HF1 (F5A51) Binds in Reverse, No 4th Gear
Complaint: After overhaul, a Hyundai or Kia equipped with the A5HF1 (F5A-51) transmission binds up in reverse range and does not have fourth gear. Cause: The Failsafe Valve “B” keeper fell out of the valve body unnoticed, refer to figure 1. That will allow the valve and sleeve to move out far enough to create
Seeing the Forest AND the Trees
They say that the proverbial phrase “I couldn’t see the forest for the trees” means that a person or organization cannot see the big picture because it focuses too much on the details. I have seen this phrase used after days of diagnosing a transmission problem without resolve, yet the cause is staring you in
The Manifold Pipeway
The Honda six-speed transmission has been on the bench of many specialty shops for one reason or another (figure 1). But, for those of you who have yet to lay your hands on one, mounted on the upper side of the unit is one of the largest, if not the largest solenoid and pressure switch
4L60E Harsh 1-2 Shift
The 4L60E transmission platform has been in service from 1993-2015; that’s 22 years. It amazes me when a transmission that has been around for this long can throw a new twist on a common problem and blindside you. Let us have a look at the systems and potential problems in a 4L60E that can cause
Dodge Ram 65RFE Erratic Shifting
No trouble codes are stored, however, the scan tool indicated the downshifts out of sixth and fifth gears were commanded.
Allison 1000/2000 Series Slipping on Initial Forward Take-Off
With nothing found in the transmission that could be blamed for the slip complaint, the valve body was disassembled for inspection.
Chevrolet 6L90 Hill Start Assist Inoperable
The vehicle came back with a complaint of the “Hill Hold Assist” feature was not working since the remanufactured transmission was installed.
GM 4L70E Leaking out of Vent
Complaint: After overhaul, a 4L70E has a complaint of transmission fluid leaking from the transmission vent. There were no cooler restrictions or filter problems and there was no evidence of cavitation. Cause: The input speed sensor passage and the vent passage in the pump can be connected as shown in figure 1. The rebuild technician
Shift Pointers: Mazda Sensitive to Pressure
A Mazda with the “SKYACTIVE” FW6A-EL transmission uses pressure switches to monitor the clutch application. When engagement pressure is supplied to the applicable clutch and brake, the oil pressure switch contact point closes. The TCM detects that clutch engagement pressure is supplied to the clutch/brake by opening/closing the oil pressure switch contact point. There have
Hyundai/KIA A8LR1 P0841
A 2012 Hyundai Genesis equipped with the A8RL1 eight-speed transmission (figure 1) has an original complaint of harsh reverse engagement, harsh 2-3 and 4-5 upshift and a neutralization condition. Since parts for this transmission were not readily available and an aftermarket remanufactured transmission could not be found, a Hyundai factory remanufactured transmission was installed. After
Ford/Mazda 4F27E/FN4A-EL Shifts from Second to Neutral
Complaint: A Ford with a 4F27E transmission was just overhauled and now has a complaint of a shift from second gear to neutral. Cause: This transmission needed to have the rear planetary that splines to the direct clutch hub, refer to figure 2, replaced, a planetary was taken from parts stock and installed. The planetary
