It (the manual) says:
1. Attach test harness in line break of wiring MD998478
2. Make sure all wires are connected
3. Attach voltmeter's "+" to the read wire and "-" to the blue wire (ground).
4. turn on ignition and check the voltage in 2 positions of the leveler.
I don't think it would help you
There's my recommendations.
I don't know if there's 3 or 2 wires in TPS connector.
if there's 2 lines one is power and another is signal
if there's 3 lines - they are power, signal and grounding.
So, here we go.
1. Disconnect TPS connector, turn on ignition and find the power line - it should be +5V.
2. Now, turn off ignition, and locate the signal line. If there are 2 lines, the one left should be signal. And if there are 3 lines - simply locate the grounding wire with ohmmeter.
3. Now, when you know the wires you have 2 options. You can read the signal using a needle - just thrust it into the signal wire and use the voltmeter with your ignition on (the sensor should be connected to the main wiring harness). Or you can use external 5V supply and read the signal through detached connector.
Best regards