Dodge ZB 2005 Service Manual page 1165

DRIVEABILITY - GAS
P0121-TP SENSOR VOLTAGE DOES NOT AGREE WITH MAP —
TEST
1 NOTE: Diagnose any TP Sensor or MAP component DTCs first before
continuing.
NOTE: If the P0500 - No Vehicle Speed Signal is set along with this DTC,
refer to the P0500 diagnostics before continuing.
NOTE: The throttle plate and linkage should be free of binding and carbon
build up.
NOTE: Ensure the throttle plate is at the idle position.
Ignition on, engine not running.
NOTE: Repair any vacuum leaks that are present before continuing.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
No
2 Start the engine.
With the DRBIII , monitor the MAP Sensor voltage.
Snap the throttle.
Does the DRBIII display MAP voltage from below 2.0 volts at idle to above 3.5 volts
at WOT?
Yes → Go To 3
No
3 Ignition on, engine not running.
With the DRBIII , monitor the TP Sensor voltage while slowly depressing the
throttle pedal from the idle position to the wide open throttle position.
Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth
transition?
Yes → Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
No
4 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the (K7) 5-volt Supply circuit from the TP Sensor harness
connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 5
No
5 Measure the resistance between ground and the (K7) 5-volt Supply circuit at the TP
Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the (K7) 5-volt Supply circuit.
No
ACTION
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 10
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 4
→ Repair the excessive resistance in the (K7) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 6
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Continued
APPLICABILITY
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