P0121

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 13:

Tests 14 - 17:

SYMPTOM
P0121 - TPS 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
When the manifold vacuum is low, the TP sensor signal should be high. Conversely, when manifold vacuum is high, the TP sensor signal should be low. If the MAP Sensor and TP Sensor do not respond within 4 seconds as stated above, a DTC will be set.

POSSIBLE CAUSES
- MAP sensor vacuum port
- Throttle position sensor voltage > 1.0 volt
- TPS voltage change not smooth
- TPS harness/connectors observable (E)
- MAP sensor wiring harness intermittent
- MAP sensor wiring harness observable problem
- Throttle body inspection
- TPS 5 volt supply circuit open
- TPS 5 volt supply circuit shorted to ground
- Throttle position sensor
- Throttle position sensor (voltage > 1.0 volt)
- Powertrain control module
- MAP sensor