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My Automatic Renault Truck 420 DCI premium gear lever seems not to be recognized and therefore isnt changing the gears......please help

The truck engages gear 2 level when it attains the required pressure levels and drops to Neutral when the pressure goes down. the gear lever seems not to be communicating with the astronic gearbox

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  • Cars & Trucks Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 05, 2012

Testimonial: "Dennis, totally agree with you on that. In deed we got to diagnostics and it showed a fault in the gear control unit(lever)- it must have a short circuit on one of the boards. Do you know where i can get a used piece? The truck specs are as below: chassis number:VF622JVA000104024 "

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SOURCE: 1994 pajero 2.8 auto. Gearbox

hi maybee the kikdown cable is over adjusted

Posted on Oct 07, 2008

  • 1 Answer

SOURCE: daewoo automatic gearbox slipping

i have the same promlems

Posted on Oct 10, 2008

emissionwiz
  • 79189 Answers

SOURCE: 97 gmc pickup with automatic transmission trouble

1st thing to do is test the system for codes, the problem is most likely a failed or stuck shift solenoid indside the trans, have you ever serviced the trans, sometimes a fluid and filter cahnge will cure these kinds of issues.

Posted on Nov 02, 2008

emissionwiz
  • 79189 Answers

SOURCE: automatic gearbox won't engage any gear

if the fluid is full then the only thing it can be is either the trans range selector switch, the trans computer or a mechanical failure in the trans, u will need the system tested for any stored trouble codes.

Posted on Dec 15, 2008

  • 566 Answers

SOURCE: GEARBOX WONT GO INTO GEAR

hi from uk could you please give a little more info ? what make/model car ? has this problem occured suddenly? has car been layed up off road some time prior to this unable to select gears ? this problem sounds very much like the clutch drive plate is either stuck to flywheel hence question above ? or it is sticking on primary/spigot shaft for some reason and failing to disengage drive to g/box? how does clutch pedal feel ? you might try selecting 2nd gear with clutch fully pressed and h/brake on then try starting engine if engine starts ?runs then put slight revs on and slip clutch a few times this may work if plate is sticking? if you come back with update may be able to advise further

Posted on Dec 24, 2008

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Hi there,

The Check Engine light is primarily for faults relating to the engine emission circuits.

The condition you have described above means you have transmission "slippage" in the 4th gear / overdrive circuit. This can be caused by many factors.

Changing trans fluid is always the first step, but...

1) Use ONLY FORD approved trasmission fluids (specifically for your Mercury) - do not use any other brand/type, unless specified.
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Regards Johngee10

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