P1121

DTC P1121: TP Sensor Signal Lower Than Expected

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Open the throttle fully.
4. Check the TP SENSOR in the DATA LIST with the HDS.

Is the throttle position less than 4.0 degrees (REL) (14 % (REL)) for 5 seconds?

YES - Go to step 8.

NO - Go to step 5.

5. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
6. Test-drive the vehicle at 16 mph (25 km/h) or more, and at 1,400 rpm or more.
7. Monitor the OBD STATUS for DTC P1121 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 8.

NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates NOT COMPLETED, go to step 5 and recheck.

8. Turn the ignition switch OFF.
9. Replace the throttle body.
10. Turn the ignition switch ON (II).
11. Reset the ECM/PCM with the HDS.
12. Do the ECM/PCM idle learn procedure. Programming and Relearning
13. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
14. Test-drive the vehicle at 16 mph (25 km/h) or more, and at 1,400 rpm or more.
15. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P1121 is indicated, check for poor connections or loose terminals at the TP sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 16.

16. Monitor the OBD STATUS for DTC P1121 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the TP sensor and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 13 and recheck.