Mazda mpv6 keeps slipping and does not change into fourth gear

Which transmission does yours have 4T65-E or 4T80-E ?

4T80-E
No Fourth Gear

Checks

Causes

1-2 Shift Solenoid Valve
?€¢
Inoperative
?€¢
Debris
?€¢
Pinched wires

3-4 Shift Valve Bore Plug

Misassembled

4th Band

Burned, slipping, missing

4th Servo Cover

Cracked

4th Servo Pin

Broken, seized

4th Servo Piston

Damaged

4th Servo Seals

Rolled, cut or damaged
4T65-E
Slipping or No Fourth Gear
Slipping or No Fourth Gear Checks
Cause

DEFINITION: A large engine RPM increase is noted in fourth gear, Drive range, with little or no vehicle forward speed increase. First, second, and third gear operation are normal. Shifts into fourth gear are soft or do not occur. Fourth gear ratio is 0.705:1.

Automatic Transmission Fluid Level
Low fluid level

Transmission Main Line Pressure
Low transmission main line pressure

Oil Filter Assembly
• The oil filter assembly (100) is missing, plugged, or damaged.
• The oil filter seal assembly (101) is missing or is damaged.

Control Valve Body Assembly
• The 3-4 shift valve (362) or the 4-3 manual downshift valve (360) is stuck or binding.
• Debris is found in the passages of the control valve body (301) or of the control valve body spacer plate and gasket assembly (396)

Case Cover Assembly
Distortion or damage occurs at the manual valve (404) or at the case cover (401), causing PRN oil leak.

Driven Sprocket Support Assembly
A plugged third clutch oil passage in the driven sprocket support assembly (609)

Fourth Clutch Assembly
• The clutch plates (500-502) are worn, damaged, or misassembled.
• A missing or not seated fourth clutch spring retaining ring (601)
• A damaged spring assembly (602) or piston (603)
• Worn or damaged fourth clutch piston seals (604, 605)

Third Clutch Sprag Assembly
• The sprag (720) was misassembled or backwards on the inner race (661).
• A damaged third clutch sprag assembly (653, 661, 719-721)

No,problem could be in the gearbox, sounds like the clutches are slipping. The only way to find this out is to remove the transmission oil pan and check color of oil or if any brass colored substance in oil(shiny). That will be the clutches, and if oil smells burnt

did the replace the PCM which is the brain or did he replace the transmission control module in front of the transmission. if the mechanic just PCM then you need the transmission control module

sounds like the syncro for fourth gear is warn out you need to take it apart to repair it

trans needs service bands/plates need adjusting, you would need to be relatively competent with tools to do this at home.

Yes it is the clutch slipping, in high gear the greatest load is put on the clutch so that is when they slip the most.

P0732 - Improper Ratio for Second Gear.
P0734 - Improper Ratio for Fourth Gear.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as follows:

Torque converter slip ratio = A x C/B A: Output shaft revolution signal from revolution sensor B: Engine speed signal from ECM C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (2nd and 4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

This malfunction will be caused when shift solenoid valve B is stuck open.

Gear positions supposed by TCM are as follows. In case of gear position with no malfunctions: 1 , 2, 3 and 4 positions In case of gear position with shift solenoid valve B stuck open: 4* , 3, 3 and 4 positions to each gear position above.

Symptoms: Engine Light ON (or Service Engine Soon Warning Light)

Diagnostic trouble code A/T 2ND GR FNCTN with CONSULT-II or P0732 without CONSULT-II is detected when A/T cannot be shifted to the 2nd gear position even if electrical circuit is good.

Possible Causes:
- Shift solenoid valve B
- Each clutch
- Hydraulic control circuit


Check it and tell us news.

Check you tranny fluid make sure its full.Also check if its not leaking into the gears making them to slip while changing gears. Also as the transmission job is done.Make sure the transmission is aligned properly. If you feel a strong **** or clunk while shifting, the car may have a transmission problem. Every gear should shift smoothly and easily without any noises or jerks. If still the same problem then its the transmission problem it has to be replaced.There are many many other users facing the same exact problem in Mazda -6 cars.That mazda is having transmission problems, they had it on the 6 and they now have a new program to upgrade the car software to fix the shifting problem .Ask you car Mazda dealer about the updated program for this transmission shifting problem. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

sounds like a shift solenoid in the trans.

Thankyou anyway, problem already solved