P0121

Tests 109 - 114:

Tests 115 - 118:

SYMPTOM
P-0121 TPS VOLTAGE DOES NOT AGREE WITH MAP

WHEN MONITORED
With the engine running and no MAP sensor or TP sensor trouble codes.

SET CONDITION
PCM performs 2 separate tests on TPS. High volt test when engine speed very low and manifold vac very high; indicates throttle plate nearly closed. Low volt test when eng speed > 25mph and manifold vac low; indicates throttle plate open, TPS signal high.

POSSIBLE CAUSES
- MAP sensor trouble code present
- TPS 5-volt supply circuit open
- TPS connectors & terminals observable defect
- TPS harness or connectors intermittent defect
- TPS voltage change not smooth
- TPS voltage above 1.0 volt
- TPS voltage above 3.5 volts