Instrument Pod

Temperature Gauge Troubleshooting

If you look in front of the oil refill port on top of the engine, there is a temperature sensor used
by the vehicle's brain. Behind that is a round sensor with two spade lugs. The large one to the
front is the temperature send signal which goes directly to the temperature gauge. The smaller
one to the rear is the "engine has reached critical temperature point" sender, i.e.. it illuminates
the overheat indicator at the top of the temperature gauge range.

You need to know whether your gauge is okay. The easiest way to check this is to briefly short
the temperature send signal lug to earth and see if the needle goes to the far end of the hot
range of your gauge. If it does, the gauge is good and the sensor needs changing. If so, check
the resistance of the sensor relative to earth. It should be (from memory) about 140 ohms cold
to around 50 ohms hot give or take.

To check the wiring, you need to check the continuity between the temperature send signal lug,
and the respective point it enters on the LH brain cabling entry on rear of instrument cluster.
Whilst there, again, short the temperature send signal (except at the instrument cluster end),
briefly to ground and see if the needle goes to the hot end of the gauge. If so, a wiring problem,
if not, the gauge needs repairing or replacing. I have repaired the gauges before although it is
very fiddly work. Quite often, one of the fine inductor wires severs close to the solder post end
and it can be fixed with a careful steady hand.

Regards,
Jarod