P0121

Test 1:

Tests 2 - 6:

Tests 7 - 11:

Tests 12 - 16:

Tests 17 - 21:

Test 22:

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 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
- High resistance in 5 volt supply circuit
- High resistance to ground in 5 volt supply circuit
- Intermittent condition
- High resistance in 5 volt supply circuit
- High resistance to ground in 5 volt supply circuit
- Map sensor
- High resistance in map sensor signal circuit
- High resistance to ground in map sensor signal circuit
- High resistance in sensor ground circuit
- PCM
- Throttle position sensor
- High resistance in throttle position sensor signal circuit
- High resistance to ground in throttle position sensor signal circuit
- High resistance in sensor ground circuit
- PCM