Dodge Dakota (R1). Manual - part 835
Symptom:
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP
When Monitored and Set Condition:
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
TEST
ACTION
APPLICABILITY
1
NOTE: Diagnose any TPS or MAP component DTC first before continuing.
NOTE: If the P0500 - No Vehicle Speed Signal is set long with this DTC, refer
to the P0500 diagnostics before continuing.
NOTE: The throttle plate and linkage should be free with binding and
carbon build up.
NOTE: Ensure the throttle plate is at the idle position.
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip displayed and equal to zero?
All
Yes
→
No
→
72
DRIVEABILITY - GAS