80 Series Diesel Tacho Problem

Submitted: Thursday, Feb 13, 2003 at 14:40
ThreadID: 3358 Views:3063 Replies:2 FollowUps:1
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I own a 1996 Landuiser GXL with a 1HZ engine. The tacho needle sits on '0' at at low revs (under 2000 rpm) and seems to read lower than it should at higher revs.

I want to trace the wiring back, and maybe check the sender unit, but I don't where the sender unit is.

Does anyone know where the tacho gets its signal from (eg fuel pump or alternator) ? Has anyone else experienced problems like this?
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Reply By: Member - Mal - Thursday, Feb 13, 2003 at 15:56

Thursday, Feb 13, 2003 at 15:56
Don't know for sure but it probably comes from the flywheel. Some vehicles have something embeded in the flywheel (I think a magnet) aod a receptor in the bell housing determines the rate at which the device goes past and the signal is relayed to the tacho. I could be wrong.
Mal T.
AnswerID: 13044

Reply By: desert - Thursday, Feb 13, 2003 at 16:09

Thursday, Feb 13, 2003 at 16:09
The tacho sensor is located on the fuel injection pump. Sandwiched between the body housing and the engine block. But, from memory it cannot be unscrewed unless the injection pump is first removed. As this is a time consuming operation, it would seem prudent to have the dash instrument checked firstly by an instrument repair shop.
AnswerID: 13045

Follow Up By: Derek - Friday, Feb 14, 2003 at 00:45

Friday, Feb 14, 2003 at 00:45
Desert is correct. It's in a cow of a spot and I think he is right in that the pump would need removing to remove the sender.
FollowupID: 7657

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