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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