[Trevor]

Joe lucky I saw your post as there has bean a lot of traffic of late.

The manual says to measure voltage at the TPS by inserting meter probes into the plug at the ECU. Nice and easy that is ! In order to accomplish the feat more easily you will require, best of all, one of those dress making pins with a nice thin shank and a knob on the end, or a thin needle. Also a meter to measure 0 . 5 volts d.c..

The TPS comprises a potentiometer, presumably used in a voltage divider configuration, as three wires come from it. There is a plug and socket close to the unit so that it can be easily removed for servicing. At this plug the wires are --- black ground and one end of the resistance element, red the other end and white the wiping contact.

Stick your pin right through the white insulated wire so that you can clip your meter lead onto it to make measurements. A fine pin will not damage the conductors as they will spread and there will be no significant damage to the insulation. Measure between the wiper, i.e. white wire and ground by connecting to engine, chassis. or whatever.

Now from the book :-- 1. Connect all connectors. 2. loosen TPS fixing screws. 3. Turn ignition on. 4. Adjust TPS position while throttle valve is FULLY closed, using a volt meter, to specified voltage. 5. tighten fixing screws.

The voltage is specified as 0.45 -- 0.55 volts. I had no trouble in setting things at exactly half a volt.

Before removing the TPS or altering the original setting it is a good idea to mark the mating castings with a scratch so that one can check on the adjustment, before and after, as a matter of interest. It always is nice to know if the effort expended has in fact improved things.

Knowing the connections of the unit it is easily checked with an ohm meter after removal for smooth operation or otherwise. Evan without dismantling a spray with CRC or similar cleaner and a work out will do wonders. The resistance end to end ( black to red ) should measure very close to 5000 ohms.

Having rather laboriously typed the above I think I should do a spot of pasting and stick it in Ò technical Ò as others may be interested. I hope you will have improvements as a result.