1. Problem Verification
- Turn ignition switch to ON position
- 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.