DTC P0122: Throttle Position (TP) Sensor Circuit Low Input
- Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select TP sensor parameter on scan tool. Observe scan tool display while depressing accelerator pedal to full throttle position. If scan tool display remains at zero percent, go to next step. If scan tool display changes smoothly from zero to 100 percent, check for an intermittent problem. See TESTS W/O CODES article.
- Turn ignition off. Disconnect TP sensor harness connector. Turn ignition on. Using DVOM, measure voltage between ground and Gray/Red wire at TP sensor harness connector. If voltage is 4.75-5.25 volts, test TP sensor. See DTC P0121 : THROTTLE POSITION (TP) SENSOR SYSTEM PERFORMANCE. If TP sensor is okay, go to step 4). If voltage is not as specified, go to next step.
- Check for an open or short to ground in Gray/Red wire. Check for poor connection at PCM. Repair as necessary. If wire is okay, replace PCM and retest system.
- Check for an open or short to ground in Gray wire. Check for poor connections at TP sensor or PCM. Repair as necessary. If wire is okay, replace PCM and retest system.