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| The ECM used the TPS voltage to determine throttle position. This information along with other sensor data is used to determine dynamic ignition advance and fuel injector pulse width. |
| On 1985-1991 (I believe) Corvettes the TPS mounting holes are slotted for adjustment. One of the torx mounting screws can be removed to verify that the holes are slotted. The TPS connector has the following pin-outs. |
|
[A]-Black, Ground |
|
Typical TPS base idle voltage readings are: Voltage, Stock (+0.54Vdc) Performance (+0.65Vdc) |
| [1] Before adjusting the TPS the IAC pintel must be fully extended to the base idle position see ("How to Service the Idle Air Control (IAC) for this procedure.") |
| [2] Connect a scan tool to the ALDL or a DMM across the TPS connector ground and TPS signal terminals. |
| [3] Slightly loosen the two torx screws holding the TPS to the throttle body. (TB) |
| [4] Adjust the TPS position for the desired base idle voltage and tighten the torx screws. |
| [5] Manually move the throttle to wide open position (WOT) and verify that the TPS voltage is at or above +4.6 to 4.7 Vdc. |
| [6] If the WOT voltage is not sufficient, slightly loosen the torx screws and readjust the base voltage moving top or bottom of the TPS. |
| [7] Repeat until the base idle and the WOT settings are adequate. CAUTION! If the TPS base voltage is set too high a code 21 may be set off indicating too much throttle with idle speed below 2000rpm. |
