e23 is a code for a throttle position sensor fault:

- Sensor power supply voltage has a malfunction.
- Throttle position sensor signal circuit is open or shorted.
- A malfunction occurs in relation between throttle position
sensors 1 and 2.
- When the fully-closed position learning value was
unusually small or was not learning.

check continuity between theses pins on the tps and the ecm connectors
make sure you unplug both connectors before this test
1 on the tps to 47 on the ecm
4 on the tps to 50 on the ecm
5 on the tps to 66 on the ecm
2 on the tps to 69 on the ecm
also check for shorts between these wires

next the voltages you should get back probing the ecm connector
66 - sensor ground = 0v
47 - sensor power supply = 5 volts
50 - tps1 signal @ idle = approx 0.6v @ 2000 rpm = approx 0.7v
69 - tps2 signal @ idle = 4.5v @2000rpm = approx 4.4v
(remember 2 pots make up the tps)

now on the expected voltages for the tps 1 &2 signals i thikn its a typo for the "@ 2000 rpm" voltages i think they should be reversed
example tps1 signal @ pin 50 @ 2000rpm i would think should be 4.4v opposite of what the book says but im not sure prosh maybe you could jump in on that

with your pin 5 on the tps showing.65 volts i might check for a short between pins 5 (ground) and pin 4 (tps signal1) on the tps connector with it and the ecm unplugged

also this is a shielded cable
the shield goes into the ecm connector at pin 1

applying voltage to the tps (with an ohmmeter checking resistances of the pots) may damage it so dont check it that way

"have a good luck"