2005 Mazda 3 When in AT, hard shift from Park

SNIKLE1994

MEMBER
2005 MAZDA 3
4 CYL
FWD
AUTOMATIC
46,000 MILES

After a Speed Sensor check engine code came on, car would hard shift from a halt at a light. The gear indicator would show 3rd gear, and stay even after stopping. When you stepped on gas it would hard shift to first. Other than that, normal operation. I had the code checked and it was a Speed Sensor (P1075 I believe). I had the Tranny flushed, and had a garage put a new speed sensor in. Now it is fine except when shifted from Park (or reverse) to first gear, the gear indicator changes immediately (and sometimes will switch to second gear) and you get about a 4 second delay, then you feel it shift hard to first. If you give it some gas before it switches, it will speed up the switch to first, but shift even harder.

Friday, November 27th, 2009 AT 7:22 PM

1 Reply

DAVE H

MECHANIC
13,384 POSTS

Hello .. thanks for the donation .. much appreciated

I would try swapping out the TPS (throttle position sensor) if this does not work, You Really need to have the vehicle checked by a transmission shop .. Most likely cause is burnt clutch plates i'm afraid !!

EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE

DESCRIPTION AND POSSIBLE CAUSES
Excessive shift shock from N to D or N to R position/range

DESCRIPTIONStrong shock felt when shifting from N to D or N to R position/range.

POSSIBLE CAUSE
Shift shock may worsen when the fail-safe is operating. If no DTC is output, the shift shock may worsen due to poor operation of the control valve body or sticking of the clutch.
Clutch burnt (N-->D: Forward clutch, N-->R: Reverse clutch or low and reverse brake)
Line pressure low, high
TP sensor malfunction
Accelerator pedal position sensor malfunction or mis-adjustment
Vehicle speed sensor malfunction
Input/turbine speed sensor malfunction
Shift solenoid B malfunction
Shift solenoid D malfunction
Shift solenoid A malfunction
Shift solenoid C malfunction
Pressure control solenoid malfunction
Control valve body malfunction
Sensor GND malfunction
Body GND malfunction
Poor hydraulic operation (Malfunction in range change)
Forward accumulator malfunction
Servo apply accumulator malfunction
Pressure switch malfunction
Idle speed high
Poor tightening torque of engine mount, exhaust mount
Poor operation of mechanical pressure
Selector lever position disparity

Hope this helps