PDA

View Full Version : Renix TPS Ground measurement


ptf18
July 14th, 2010, 05:56
What should the Renix TPS ground resistance be? Mine, from the "B" terminal of the connector to the firewall ground, the battery post ground and engine block measures 1.5 ohms.

cruiser54
July 14th, 2010, 06:06
It's a voltage measurement you're looking for, not resistance. Search "TPS adjustment".

Shorty
July 14th, 2010, 07:55
What should the Renix TPS ground resistance be? Mine, from the "B" terminal of the connector to the firewall ground, the battery post ground and engine block measures 1.5 ohms.

although I've not measured mine, I'd say less than an ohm. I know many people who've added an ancillary ground from the TPS to a solid ground and reported much more stable idle speeds and more predictable cold start idle speed.

In theory, the better the ground circuit, the closer to the 5V reference signal you will get at the TPS. You will need to re-adjust the TPS after adding/cleaning the ground, but I'm told it's worth the time and effort to do it.

Matthew Currie
July 14th, 2010, 07:59
1.5 ohms seems a bit high, and I'd agree that a dedicated ground wouldn't hurt. But remember that if you have a digital meter set at its most sensitive, you'll probably be getting .4 or so residual resistance from the meter fuse, so don't get all fanatical about eliminating that last half ohm.