Dodge Dakota (R1). Manual — part 885
Symptom:
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH
When Monitored and Set Condition:
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH
When Monitored:
Continuously with the key on, engine running, and gear selector NOT
in park or neutral.
Set Condition:
This code will set if the vehicle speed (from the CAB module) is above 24
kmh (15 MPH), and the Output Shaft Speed sensor is below 60 RPM for 2.6 seconds.
POSSIBLE CAUSES
PARK/NEUTRAL DTC PRESENT
INTERMITTENT WIRING AND CONNECTORS
OUTPUT SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
OUTPUT SPEED SENSOR GROUND CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
OUTPUT SPEED SENSOR
PCM - OUTPUT SPEED SENSOR
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter for P0720 displayed and equal to 0?
All
Yes
→
No
→
2
Ignition on, engine not running.
With the DRBIII
t, read the Powertrain Control Module DTC’s.
Is there a Park/Neutral DTC present?
All
Yes
→
Repair the Park/Neutral DTC before proceeding.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
272
TRANSMISSION
TEST
ACTION
APPLICABILITY
3
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary
Measure the resistance of the Output Speed Sensor ground circuit between the PCM
harness connector and the Output Speed Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Output Speed Sensor negative ground circuit for an
open.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
4
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance between ground and the Output Speed Sensor ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Output Speed Sensor ground circuit for a short to
ground.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
5
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance between ground and the Output Speed Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Output Speed Sensor Signal Positive circuit for a short
to ground.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
6
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance of the Output Speed Sensor Signal circuit between the PCM
harness connector and the Output Speed Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Output Speed Sensor Signal circuit for an open.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
273
TRANSMISSION
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Ignition on, engine not running.
Measure the voltage of the Output Speed Sensor ground circuit in the Output Speed
Sensor harness connector.
Is there any voltage present?
All
Yes
→
Repair the output speed sensor ground (-) circuit for a short to
voltage.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
8
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the Output Speed sensor Signal circuit in the Output Speed
Sensor harness connector.
Is there any voltage present?
All
Yes
→
Repair the output speed sensor signal (+) circuit for a short to
voltage.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
9
Turn the ignition off.
Disconnect the Output Speed Sensor harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance between the terminals of the Output Speed Sensor.
Is the resistance between 300.0 and 1200.0 ohms?
All
Yes
→
No
→
Replace the Output Speed Sensor in accordance with the Service
Information.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
10
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
274
TRANSMISSION
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH —
Continued
TEST
ACTION
APPLICABILITY
11
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help duplicate the conditions that set
the DTC. Pay particular attention to the DTC set conditions, such as, VSS,
MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform TRANSMISSION VERIFICATION TEST VER - 1.
No
→
Test Complete.
275
TRANSMISSION
P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH —
Continued
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