1. Problem Verification

1. Turn ignition switch to ON position
2. Using a Hi-Scan (Pro), monitor the TPS signals while slowly opening the throttle.
   • Refer to DTC P0121  SPECIFICATIONS   for more information. 

Is signal within specification and consistent with the normal curve? 

No: Go to next step.

Yes: Problem is intermittent or was repaired and engine control module memory was not cleared. Proceed with intermittent problem procedure.