P0121

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 10:

Test 11:

SYMPTOM
P0121-THROTTLE POSITION SENSOR #1 PERFORMANCE

WHEN MONITORED
With the engine running and no MAP Sensor or TP Sensor DTC's set.

SET CONDITION
The PCM determines a valid range in which the TP Sensor should be, at a given RPM/Load. The actual TP Sensor voltage is then compared to this value. If the TP Sensor voltage does not fall within the expected range within a predetermined time an error will be detected. One Trip Fault.

POSSIBLE CAUSES
- TPS sweep
- Intermittent condition
- Resistance in 5 volt supply circuit
- Resistance to ground in 5 volt supply circuit
- TP sensor
- Resistance in TP sensor signal circuit
- Resistance between ground and TP sensor signal circuit
- Resistance in the sensor ground circuit
- PCM