Handy tip for Renix injection systems TPS adjustment.

Feb 25, 2012 2 Replies

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Budd Cochran 14 years ago

My 89 XJ wasn't shifting right (AW-4 auto) and neither the instructions in my Chiltons or my Haynes manuals seemed to work for setting the TPS.

But I remembered reading about another method using a percentile of the measured supply voltage (across the grey and black wires at the connector to the TPS).

So, with my trusty calculator and the numbers from the manual I figured the percentage needed ...16% of the supply voltage.

Since my system didn't measure a full 5 volts (4.85 V), I adjusted for

0.77-0.78 volts output from the TPS, then I disconnected the battery for 30 seconds to reset the computer.

Now the trans shifts perfectly and the engine runs better.

Budd

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DougW 14 years ago

Interesting aproach. Alas my tps is fixed in the ZJ, so the problem is almost always a wear-spot somewhere right at light pedal on the highway. Causes the transmission to downshift or hiccup between gears! And the real _bitch_ is the TPS tests just fine.... Even for a 93, these sensors are twitchy.

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Will Honea 14 years ago

That's when I flood the !@#$%^& sensor with WD40 and work the throttle back and forth a bunch of times. WD40 is NOT primarily a cleaner but it works pretty well on mechanical contacts like rheostats and connectors - just blow things as dry as you can when done. You can force the stuff into the housing if you spray it close to the shaft. Been "servicing" my TPS that way for years.

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