Nissan Patrol TD4.2 Tacho

Submitted: Tuesday, Jul 12, 2005 at 19:36
ThreadID: 24660 Views:4596 Replies:2 FollowUps:1
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Can anyone help? The tacho on my diesel has just started playing up
It only works when the engine has warmed up or traveled 6 or 7 Km
down the road.Could it be a faulty sensor?Tacho.

Cheers Joe
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Reply By: Member - Pezza (QLD) - Tuesday, Jul 12, 2005 at 20:12

Tuesday, Jul 12, 2005 at 20:12
G'day Joepatrol,

What city do you live in, am in brisbane. Mine went aswell, was the gauge, but I have a spare sender unit you can try to eliminate that possibility.

AnswerID: 120019

Reply By: joc45 - Wednesday, Jul 13, 2005 at 13:45

Wednesday, Jul 13, 2005 at 13:45
Hi Joe,
Sounds like the tacho itself; the sender is just a coil with a permanent magnet built in. Most unlikely that this would be affected noticeably by engine heat, but it could be going open circuit when cold.
Check the sender (mounted right at the front of the engine, below the thermostat housing). There's a connector for it on top of the inlet manifold. With a multimeter, check the continuity of the sender, which should show some resistance (not shorted or open circuit). Run the engine, and measure the output voltage (set meter to AC volts), and you should be able to see a measureable voltage. If all ok, then it's most likely the tacho itself.
Brace yourself for replacement cost of the tacho, the sender is a bit cheaper.
Cheers, Gerry
AnswerID: 120140

Follow Up By: JOEPATROL - Wednesday, Jul 13, 2005 at 21:38

Wednesday, Jul 13, 2005 at 21:38
Hi Gerry
Thanks for your helpfull reply will try and run these tests on weekend
May even pull out the instrument panel, to look for anything out of the ordinary.
Cheers, Joe
FollowupID: 375295

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