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Assuming LH 2.4 you should see the following at the TPS itself:
- From pin 2 (where the yellow-white wire attaches) to ground, continuity with the throttle closed, open at all other positions.
- From pin 3 (where the white-black wire attaches) to ground, continuity at WOT and open at all other positions.
If you don't have the Bentley manual, you need it. The complete diagnostic procedure for the FI system is described in section 241. Haynes is not a good substitute. Is the ECU setting any codes?
From your last post, it almost sounds as if your TPS is backwards. Bentley does not identify which way is clockwise in its TPS adjustment procedure, so I can't compare what you did to what Bentley suggests.
The bypass valve failure mode is "high idle". "Fully closed" is actually past center, with an open gap. On the valve, you should measure 8 ohms across the terminals. The piston inside should rotate/spring back freely when 12 volts is applied. I've had good luck cleaning sticky bypass valves with spray carb cleaner.
Last time I had a problem with the bypass valve, the connector on the wiring harness was faulty - one of the contacts lost it's "spring" and was very loose, causing intermittant idle speed weirdness. Splicing in a recylced connector solved the problem.
Hope this helps!
-Ron
Will code for Volvo parts.
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