P0121

Test 1 - 5:

Test 6 - 10:

Test 11 - 15:

Test 16:

SYMPTOM
P0121-TP SENSOR VOLTAGE DOES NOT AGREE WITH MAP

WHEN MONITORED
With the engine running and no MAP Sensor or TP Sensor 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 TP Sensor should be low. When the manifold vacuum is low, the TP Sensor signal should be high. If the proper TP Sensor voltage is not detected when the two conditions are met, a DTC will be set after 4 seconds.

POSSIBLE CAUSES
- Good trip equal to zero
- Resistance in the (K7) 5 volt supply circuit
- (K7) 5 volt supply circuit shorted to ground
- Map sensor
- Resistance in the (K1) MAP sensor signal circuit
- Resistance between ground and the (K1) MAP sensor signal circuit
- Resistance in the (K4) sensor ground circuit
- TP sensor operation
- Resistance in the TP sensor (K7) 5 volt supply
- TP Sensor (K7) 5 volt supply shorted to ground
- Throttle position sensor
- Resistance In the (K2) TP sensor # 1 signal circuit
- Resistance between ground and the (K22) TP sensor # 1 signal circuit
- Resistance in (K4) sensor ground circuit
- PCM