P0121

Test 1:

Tests 2 - 6:

Tests 7 - 11:

Tests 12 - 16:

Tests 17 - 18:

SYMPTOM
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP

WHEN MONITORED
With the engine running and no MAP Sensor or TPS DTC's set. Engine speed must be greater than 1600 RPM.

SET CONDITION
The PCM performs two separate tests. When the manifold vacuum is high, the TPS should be low. When the manifold vacuum is low, the TPS signal should be high. If the proper TPS voltage is not detected when the two conditions are met, a DTC will be set after 4 seconds.

POSSIBLE CAUSES
- Intermittent condition
- High resistance in MAP 5 volt supply circuit
- MAP 5 Volt supply circuit shorted to ground
- MAP sensor
- High resistance in MAP sensor signal circuit
- High resistance to ground in MAP sensor signal circuit
- High resistance in MAP sensor ground circuit
- PCM
- High resistance in TPS 5 volt supply circuit
- TPS 5 Volt supply circuit resistance to ground
- Throttle position sensor
- High resistance in throttle position sensor signal circuit
- TPS signal has high resistance to ground
- High resistance in TPS ground circuit
- PCM