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P1778 code dont pick up speed on 4th gear - 2002 Acura 3.2TL

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I have 2004 Murano with a code p1778 how could I go about to fix. Thank u.


code p 1778 refers to CVT step motor--mechanical malfunction===causes ---step motor
the CVT is a constant velocity transmission that has no gear ratios as such but uses a special belt between two pulleys that change flange widths in unison so that as the road speed increases one pulley gets smaller and the other larger
the step motor controls the pulley adjustment
Take it to a service dealer or an accredited specialist transmission shop with experience on that transmission

Dec 31, 2016 | 2004 Nissan Murano

1 Answer

Why am I still getting codes p1529 and po734 after replacing tcm and imput speed sensor when the car warms up?


P0734 is a gear ratio code for 4th gear. In other words TCM sees 4th gear is slipping. P1529? I don't know I'm on my cell phone.

Dec 11, 2014 | 2002 Hyundai Accent

1 Answer

I Have a 2007 Suzuki Forenza with a winding in the Transmission the code PO783


get it fixed, are you going to diagnose and repair and A/T?
that car is a 1/2 GM/ Daewoo car. a sad mix of parts. (sell it? i would )
the service book is here. $4
This is called an FSM.
https://suzukipitstopplus.com/Products/1068-2007-forenza-reno-service-manual.aspx

783 (p07xx means tranny issues)

quote FSM:
Trouble Code: P0783 (2.0L L4 VIN - Auto)
3 - 4 Shift Malfunction Print this code dataprint_icon_codes.gif comments in (xxxx)
Trouble Code Conditions: (preconditions before test)
Transaxle oil temperature is greater than -10 °C (14 °F). Selector lever is not N (Neutral), P (Park) position. (warm , in gear)
System voltage is greater than 9 V.(car battery not dead)
No input speed error DTCs P0715, P0716 and P0717.
Speed sensors not dead.
Output speed is greater than 256 rpm. (tail shaft rpm (speed)
Input speed is greater than 400 rpm. (engine rpm after clutch)
3 - 4 gear shift is active. (the TCM commands shifts to 4th)
Possible Causes:
  • Circuit to solenoids bad.
  • ECM, bad.
  • TCM bad or inputs wrong.
  • end quote.
Comments:
this means, in pure physics.:
the transmission slip's
what that test failure means it bar stool talk is this.
I shafted to 4th but the MPH is too slow, so the transmission
is not shifting to 4th , or it slips

any mech would drive the car first. (did he?)
and flog it up hills (in Kansas? omg)
TO SEE, if it slips in 4th or fails to shift at all.

  1. fresh ATF? and filter? serviced and levels good on A/T
  2. is the 4th gear command to the shift solenoid good.?(logic)
  3. if trans slips? (fails FSM book stall tests) bad tranny.
  4. if the trans fails stall , check line pressure per FSM.
like that, and more, lots to say on A/T
If in uSA find a real , shop, with ASE techs. and win.

Aug 21, 2014 | Suzuki Cars & Trucks

1 Answer

Code P1778 on 2012 Nissan Rogue 56000 miles. Faulty step motor code. how do you fix it?


Bring it to the dealer, it's still under power train warranty. BTW: your going to need a new cvt trans.

Aug 08, 2014 | 2012 Nissan Rogue S 4dr SUV 2.5L 4-cyl....

1 Answer

How do replace a speed sensor on an 1996 infinty I-30 ?


1996,

ok cars have 2 to 5 speed sensors.

so saying that means nothing.

but 734 does, first post ever with speed and code in one.

usually its not.

1996 what , kia? or Infiniti? perplexed i am.

734

that is tranny, code, so why condemn the sensor

i do take it off and clean the black magnetic crap on the end every time. do so , often. and win.

Trouble Code Conditions:

NOTE: If DTC U1000 is displayed with this DTC, first perform the trouble diagnosis for DTC U1000. Diagnostic trouble code P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.

Possible Causes:



  • Shift solenoid valve A (On stick.)


  • Shift solenoid valve B (On stick.)


  • Shift solenoid valve C (On stick.)


  • Pressure control solenoid valve A (On stick.)


  • Forward and direct clutch assembly


  • U/D clutch


  • U/D brake


  • 2nd coast brake


  • One-way clutch No.1


  • Hydraulic control circuit


(so the FSM then has you conduct many tests to find true cause.)_



A/T are very very complex animals.



did you connect a scan tool that can SEE ALL factory DTC codes>

if not , you are blind..

cheap readers dont do that. they blind you.



the TCM can tell that 4th is not attained

by seeing the VSS speed too slow, that means the tranny is slipping

or is not in 4th gear, or the VSS fibbing its buns off (clean it , reset code, and drive)

Jun 24, 2014 | 2003 Kia Spectra

1 Answer

My 2000 hyundai elantra is automatic it has a code p0734. which the mechanic explained me that i have to get the speen sensor replace and get new clutch because the 4 gear ratio is bad. pls advice what 2...


P0734=A/T 4th gear incorrect ratio. This has nothing to do with the speed sensor. If the speed sensor was faulty, it would also set OTHER gear incorrect ratio codes. My experience tells me the 4th gear incorrect ration indicates the torque converter clutch (TCC) is slipping and nothing more. Unless there was a speed sensor DTC (Diagnostic Trouble Code), the sensor is not the issue (yet). The fact P0734 was set (trust the computer), the TCC is slipping (out of range). Question: Maintenance history may indicate the wrong transmission fluid may have been introduced. Hyundai's Transmission fluid is strictly SPIII... there is no substitute. The incorrect fluid will cause 4th gear slippage. Now, having said that, it doesn't mean the 4th gear (lock-up) clutch isn't worn out. Have a qualified/certified Hyundai Service Technician properly diagnose this issue.

Sep 08, 2011 | 2000 Hyundai Elantra

1 Answer

My 2000 Sephia will only shift gears manually from 1,2, then to drive. I get a code PO734. How do I fix and or slove this problem?


This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)


Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes:
  • Customer may complain of intermittent 4th gear operation
  • O/D and 2/4 pressures less than 75 psi
  • O/D or 2/4 clutch volume indexes out of specification
  • O/D accumulator seals are damaged
  • Transmission enters "limp in" mode running in 4th gear

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).
Possible Causes:
  • Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  • Transmission has internal problems or damage present
You have a transmission problem.Hope this helps, James Booth

May 17, 2011 | Kia Sephia Cars & Trucks

2 Answers

Code po734, po735


This is what your codes mean:

Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)


Trouble Code Conditions:
Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.

Possible Causes:

  • Customer may complain of intermittent 4th gear operation
  • O/D and 2/4 pressures less than 75 psi
  • O/D or 2/4 clutch volume indexes out of specification
  • O/D accumulator seals are damaged
  • Transmission enters "limp in" mode running in 4th gear

Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)

Trouble Code Conditions:
Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).

Possible Causes:

  • Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
  • Transmission has internal problems or damage present
You have a transmission problem.

Jan 17, 2011 | 2003 Dodge Durango

2 Answers

P0734


Description of fault code P0734:

This code is set if the value of input shaft speed is not equal to the value of the output shaft, when multiplied by the 4th gear ratio, while the transaxle is engaged in 4th gear. This malfunction is mainly caused by mechanical troubles such as control valve sticking or solenoid valve malfuctioning rather than an electrical issue.

From experience (sorry) you will end up replacing the transmission. This code usually indicates an internal mechanical failure.

Dec 28, 2010 | 2003 Hyundai Accent

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