2.8L (VIN R)
Throttle Position Sensor (TPS) can also be adjusted with the use of Scan tester. This check should be performed only when throttle body parts have been replaced or after minimum airflow has been adjusted.
1) Install 3 jumper wires between TPS and TPS wiring harness connector. Jumpers can be made using the following General Motors' parts: Terminals No. 1214836 and 12014837.
2) Turn ignition to ON position. DO NOT start engine. Use digital voltmeter and connect to Dark Blue and Black wire terminals. With throttle at closed position, TPS voltage should be between .42-.45 volt.
3) If voltage reading is not as specified, rotate TPS until specified voltage is obtained. See TPS OUTPUT VOLTAGE table. If specified voltage cannot be obtained, replace TPS.
4) Tighten screws and recheck readings. Turn ignition off. Remove jumper wires and reconnect harness connector to TPS.
| Application | (1) Voltage | ||||
|---|---|---|---|---|---|
| 2.5L (VIN E) (2) | 1.25 | ||||
| 2.8L (VIN R) | .42-.45 | ||||
| 3.1L (VIN D) (2) | 1.25 | ||||
| 4.3L (VIN Z) (2) | 1.25 | ||||
| 5.0L (VIN H) (2) | 1.25 | ||||
| 5.7L (VIN K) (2) | 1.25 | ||||
| 7.4L (VIN N) (2) | 1.25 | ||||
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