Code P1122, TP Sensor Intermittent Low - "S" & "T" Series 4.3L (VIN W): Notes

Throttle Position (TP) sensor provides a voltage signal that changes relative to throttle blade angle. Signal voltage will vary from about .5 volt or at idle to about 4 volts at Wide Open Throttle (WOT). TP sensor signal is one of the most important inputs used by control module for fuel control and for most other control module control outputs. On non-adjustable TPS sensors, each time voltage drops below 1.25 volts and stops, control module assumes this value as 0 throttle angle and measures percent throttle from this point on.

1. Determines if conditions necessary to set code exist.
2. Simulates Code P0123 (high voltage). If control module recognizes high signal voltage, control module and wiring are okay.
3. Simulates a high signal voltage. Checks signal circuit for an open.