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snoozer *
Age: 53 Zodiac: Joined: 23 May 2008 Posts: 23 Location: Ireland
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Posted: Tue Jun 24, 2008 22:36 Post subject: rev counter at 1500 1/min after ignition on |
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hello,
my rev counter does recently only show 1500 1/min as soon as i put on the ignition. even with running engine no change. how does the rev counter work on a pajero ? is it like on european cars a AC signal from the alternator ? which colour has the wire ? has anyone had such a problem before ?
regards
Jan
ps: just to make it clear, its not stuck, the rev counter goes down as soon as the ignition is off. |
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Posted: Tue Jun 24, 2008 22:36 Post subject: Google Ads keep the POCUK free to join! |
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idratherbesurfing LifeTime Member
Age: 39 Zodiac: Joined: 27 Mar 2008 Posts: 3807 Location: France/Belgium/Holland/Switzerland and sometimes Italy
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Posted: Wed Jun 25, 2008 0:45 Post subject: |
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mine was revving too high a few weeks ago, the cable was stuck in the cable sheath - gave it a squirt of WD40 and had no trouble since |
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Pajero 4D56 ******
Age: 34 Zodiac: Joined: 25 Dec 2007 Posts: 2234 Location: Malaysia,Kuala Lumpur
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Posted: Wed Jun 25, 2008 13:48 Post subject: |
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I think that Rev-Counter in Pajero From MK-1 are also not use Cable Drive to the Instrutment,its a wire there behind the Fuel Pump,one is for the Stop-Solenoid and are covered with Rubber Cap easy to indentified and for the Rev-Counter are clipped to a plastic connector and the connector are held by a metal clip come from the Fuel Pump body,The problem that you has likely to have a shorted Fuel Pump-Rev-counter wire connection somewhere,Does the Rpm drop or rise when the engine is fire?
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91 Pajero MK-1 Exceed 2.5TDI LWB
81 Lancer A175 GSR Turbo 1800 |
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snoozer *
Age: 53 Zodiac: Joined: 23 May 2008 Posts: 23 Location: Ireland
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Posted: Wed Jun 25, 2008 22:20 Post subject: |
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nope not at all, steady at 1500 1/min. i does occasionally work actually, when i drive for a longer distance the rev counter starts working properly. so the signal comes from the injector pump NOT from the alternator ?
Jan |
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Pajero 4D56 ******
Age: 34 Zodiac: Joined: 25 Dec 2007 Posts: 2234 Location: Malaysia,Kuala Lumpur
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Posted: Sun Jun 29, 2008 14:28 Post subject: |
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Hi,it work when the vehicle hits Bumps or whats?And about the Rev-Counter circuit i don't know it work from the Alternator or not cause i hear some people say the are Combined,for me i know it work only from the TDC Sensor at the Fuel Pump there and you should check the conditions of the connector!
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91 Pajero MK-1 Exceed 2.5TDI LWB
81 Lancer A175 GSR Turbo 1800 |
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snoozer *
Age: 53 Zodiac: Joined: 23 May 2008 Posts: 23 Location: Ireland
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Posted: Sat Jul 26, 2008 14:10 Post subject: |
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hello,
today after i changed my exhaust i gave my rev counter a go as well. i figured out its the white cable from the injector pump which is giving the signal. all connections seem fine there. only i cant follow the cable to the end because its simply to tight for my fingers behind the pump and all the pipes. i removed the instruments as well just to see if there was an obvious loose connection but nothing. i have looked at the circuit board which contains the electronic inside the rev counter but all seems fine too. nothing is loose.
can i check the signal to the rev counter somehow ? i must be a pulsing voltage i believe. any advice on that ? i like to find out what is broken, the instrument or the sending unit/wiring.
regards
Jan |
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Pajero 4D56 ******
Age: 34 Zodiac: Joined: 25 Dec 2007 Posts: 2234 Location: Malaysia,Kuala Lumpur
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Posted: Sun Jul 27, 2008 13:37 Post subject: |
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Hi,sometime you see your connector are fine but inside it got a contact,the contact could probely be contamined with Grease or oil or rust ,that can be eazily removed by Sandpaper !you could try it,and another problem that you could posibble the that you has a Dodgy Sensor!you should Check it! |
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snoozer *
Age: 53 Zodiac: Joined: 23 May 2008 Posts: 23 Location: Ireland
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Posted: Sun Jul 27, 2008 13:55 Post subject: |
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the connector is fine. its clean and dry and no sign of any lubricant. how can i check the sensor ?
Jan |
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Pajero 4D56 ******
Age: 34 Zodiac: Joined: 25 Dec 2007 Posts: 2234 Location: Malaysia,Kuala Lumpur
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Posted: Sun Jul 27, 2008 16:33 Post subject: |
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The Tachometer(Rev-Counter)is a DC instrutment,All Mitsubishi Cars are this type,its receiving signal from the Sensor mounted at Top of the Fuel Pump(For The 2.5 4D56)when a Plunger in the pump move it touch the sensor to produce On and off action,the Rev-Counter then receive this signal then register the Revolution/minute to read!so nothing to do to test the sensor,but you can borrow one from your friend pajero to see it works!or just buy one,but a bit risky because if another thing is spoil but you have replace the another thing,the thing you waste is your money,but you can still test the Sensor by using another Tachometer(Rev-Counter)to test it work or not! |
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snoozer *
Age: 53 Zodiac: Joined: 23 May 2008 Posts: 23 Location: Ireland
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Posted: Sun Jul 27, 2008 21:51 Post subject: |
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if i connect another rev counter i dont actually test the sensor. if it does not work it can still be anything but the rev counter. when you say DC instrument, it obviously works on alternating current signal, therefor it cant actually be DC. unless there is some "smart" stuff in the sensor which makes a DC voltage varying by the revs of the engine which then would make all the electronics in the actual instrument obsolete. i am really looking for a way to test the sensor at the first connection accessible.
regards
Jan |
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Pajero 4D56 ******
Age: 34 Zodiac: Joined: 25 Dec 2007 Posts: 2234 Location: Malaysia,Kuala Lumpur
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Posted: Tue Jul 29, 2008 14:07 Post subject: |
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Em,I don't think the Rev-Counter in Pajero are works AC(From Alternator) if you have an 2.8 it are possible,but if you have an 2.5,i can Sure it works from the Fuel-Pump Sensor only ! |
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pak Newbie
Age: 46 Zodiac: Joined: 28 Sep 2009 Posts: 1 Location: Ireland
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Posted: Tue Sep 29, 2009 7:37 Post subject: Rev counter stopped at 1500 rpm. |
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Snoozer/Jan did you ever get this probelm sorted as mine has done exactly the same thing as yours by the sounds of what you wrote.
Ignition on, tacho jumps to 1500 rpm and sticks there.
thanks
Pak |
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aries ****
Age: 68 Zodiac: Joined: 22 May 2008 Posts: 254 Location: FLINTSHIRE N WALES
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Posted: Tue Sep 29, 2009 11:09 Post subject: |
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Hi
I've had this problem for ages,a tap on the dash would get it working,but after some months that did'nt work,now it won't work even if i thump the dash!!
I read on the forum,a member had the same problem,he found the solder inside the revcounter had gone dry,i think that was the term he used.
he resolded something inside the revcounter and all was fine.
It all sounded to complicated for me so i left it well alone, if anyone finds a solution let me no!!!
aries 2.8 auto swb jobby . |
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TomiDoo *
Age: 37 Zodiac: Joined: 15 Feb 2019 Posts: 18 Location: Serbian
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Posted: Tue Feb 09, 2021 21:54 Post subject: |
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old topic but have a issue
i have 4m40 with mechanic pump <1997
where is located the sensor, if someone can point with pucture
my rev arent working |
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