DTC P1120: Throttle Position (TP) Sensor Out Of Range (Low): Condition

DTC P1120 indicates TP sensor closed throttle position is less than range (.19 volt). Possible causes for this fault are:

• Faulty TP sensor.
• Faulty Powertrain Control Module (PCM).

1. Check Freeze Frame Data
   
   Ensure freeze frame data is recorded. Go to next step.
2. Check PID Status
   
   Turn ignition off. Connect scan tool to DLC. Access TP V PID on scan tool. If TP V PID is 0.19 volt or more, go to next step. If TP PID is below 0.19 volt, go to step  4.
3. Check TPS Adjustment
   
   Check TPS adjustment. See SYSTEM & COMPONENT TESTING - EXCEPT B2500, B3000 & B4000 article. Adjust as necessary and go to next step. If TP sensor cannot be adjusted properly, replace TP sensor and retest.
4. Erase DTC From Memory
   
   Clear DTC from memory. Recheck system. If DTC P1120 is reset, replace PCM and go to next step. If DTC P1120 is not reset, go to next step.
5. Recheck DTC
   
   If any DTCs are present, go to appropriate test for repair. If no DTCs are present, test is complete.