Looking over the driver's side fender into the engine bay -
RED arrow showing location of TPS itself.
|Closer look at TPS, with TPS wiring plug unplugged from rest of harness|
|Close-up view of TPS plug - note the three wire colors|
|DMM probes inserted onto *BACK* (recommended by Mazda service manual) of plug - use GREEN and BLACK wire leads.|
|DMM measuring approximately 1k-ohm with throttle at
If stock cold start system is still intact, engine must be warmed-up before checking TPS resistance.
Next, manipulate the throttle from rest position to WOT - check TPS resistance sweeps smoothly from 1k-ohm to approximately 5k-ohm (+/- 1k-ohm, or between 4k-ohm to 6k-ohm). Any TPS reading HIGHER than 6k-ohms will need to be replaced soon. TPS reading over 6.5k-ohms WILL cause high RPM hesitations!
There should be NO shorts or "blown opens" (DMM goes out-of-range or infinity) during the transition.
|If idle spec is off, locate adjustment screw. |
YELLOW arrow points at adjustment screw.
|Use a long, flat-head screwdriver to turn adjustment
screw until spec is at 1k-ohm.
After adjusting the TPS, you might have to readjust your idle speed via the BAC valve.
|Throttle stop screw - looking from the driver's side fender over the throttle body|
Throttle stop screw - looking from passenger's side fender
Note: loosen the 8mm jam nut, then use a small flat-head screwdriver to adjust.