Dodge Ram Truck 1500-2500-3500. Manual — part 1696

P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH (GAS) (CONTINUED)

3.

CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.

Disconnect the PCM C2 harness connector.

Disconnect the Output Speed Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary
Measure the resistance of the (T14) Output Speed Sensor Signal cir-
cuit between the PCM C2 harness connector and the Output Speed
Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 4

No

>> Repair the (T14) Output Speed Sensor Signal circuit for an

open.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

4.

CHECK THE (T13) SENSOR GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the (T13) Sensor Ground circuit between
the PCM C2 harness connector and the Output Speed Sensor harness
connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 5

No

>> Repair the (T13) Sensor Ground circuit for an open.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS

DR/DH

P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH (GAS) (CONTINUED)

5.

CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between ground and the (T14) Output Speed
Sensor Signal circuit.

Is the resistance greater than 100K ohms?

Yes

>> Go To 6

No

>> Repair the (T14) Output Speed Sensor Signal circuit for a

short to ground.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

6.

CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT

Measure the resistance between the (T14) Output Speed Sensor Sig-
nal circuit and all other circuits in the PCM C2 harness connector.

Is the resistance greater than 100K ohms between the (T14)
Output Speed Sensor Signal circuit and any other circuit(s) in
the PCM C2 harness connector?

Yes

>> Go To 7

No

>> Repair the (T14) Output Speed Sensor Signal circuit for a

short to another circuit(s).

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

DR/DH

AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS

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P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH (GAS) (CONTINUED)

7.

CHECK THE (T13) SENSOR GROUND CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT

Measure the resistance between the (T13) Sensor Ground circuit and
all other circuits in the PCM C2 harness connector.

Is the resistance greater than 100K ohms?

Yes

>> Go To 8

No

>> Repair the (T13) Sensor Ground circuit for a short to

another circuit(s).

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

8.

CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition on, engine not running.

Measure the voltage of the (T14) Output Speed Sensor Signal circuit
in the Output Speed Sensor harness connector.

Is there any voltage present?

Yes

>> Repair the (T14) Output Speed Sensor Signal circuit for a

short to voltage.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Go To 9

9.

CHECK THE (T13) SENSOR GROUND CIRCUIT FOR A SHORT TO VOLTAGE

Measure the voltage of the (T13) Sensor Ground circuit in the Output
Speed Sensor harness connector.

Is there any voltage present?

Yes

>> Repair the (T13) Sensor Ground circuit for a short to volt-

age.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Go To 10

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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS

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P0720-LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH (GAS) (CONTINUED)

10.

CHECK THE OUTPUT SPEED SENSOR

Measure the resistance between the terminals of the Output Speed
Sensor.

Is the resistance between 300.0 and 1200.0 ohms?

Yes

>> Using the schematics as a guide, check the Powertrain

Control Module (PCM) pins, terminals, and connectors for
corrosion, damage, or terminal push out. Pay particular
attention to all power and ground circuits. If no problems
are found, replace and program the PCM per the Service
Information. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/POWERTRAIN CONTROL MOD-
ULE - REMOVAL)

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Replace the Output Speed Sensor.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

11.

INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention
to the DTC set conditions, such as, VSS, MAP, ECT, and Load

Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched,
or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Wiggle the wiring and connectors while checking for any possible open or shorted circuits.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Were there any problems found?

Yes

>> Repair as necessary.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Test Complete.

DR/DH

AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS

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