Dodge Ram Truck 1500-2500-3500. Manual — part 1722

P0713-TRANS TEMP SENSOR VOLTAGE TOO HIGH (CONTINUED)

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHE-
MATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W

Theory of Operation

The Transmission Temperature Sensor is used to sense when the transmission temperature is too hot or too cold to
operate overdrive and/or the torque convertor clutch. When the transmission sensor detects a temperature below 0°
C (32° F), overdrive and the torque convertor clutch are disabled. When the detected temperature is above 127° C
(260° F), overdrive is disabled and 3rd gear with TCC is engaged, this strategy is used to increase transmission
fluid flow to help cool the transmission.

•

When Monitored:
Continuously with the ignition on and the engine running.

•

Set Condition:
This DTC will set if the (T54) Transmission Temperature Sensor Signal circuit voltage exceeds 3.76 volts for
the period of 2.2 seconds.

Possible Causes

(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO (F856) 5-VOLT SUPPLY
CIRCUIT

(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN

(K900) SENSOR GROUND CIRCUIT OPEN

(T54) 5-VOLT SUPPLY OPEN IN TRANSMISSION

(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO (F856) 5-VOLT SUPPLY
CIRCUIT INTERNAL TO THE TRANSMISSION

(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN INTERNAL TO THE TRANSMISSION

(K900) SENSOR GROUND CIRCUIT OPEN INTERNAL TO THE TRANSMISSION

TRANSMISSION TEMPERATURE SENSOR

ENGINE CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

1.

CHECK IF THE DTC IS CURRENT

Ignition on, engine not running.

With the scan tool, read Engine DTCs.

Record the Freeze Frame data for the reported DTC.

With the scan tool, erase DTCs.

Turn the ignition off to the lock position.

Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set.

NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.
With the scan tool, read Engine DTCs.

Did the DTC reset?

Yes

>> Go To 2

No

>> Go To 12

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AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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P0713-TRANS TEMP SENSOR VOLTAGE TOO HIGH (CONTINUED)

2.

CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO
VOLTAGE

Turn the ignition off to the lock position.

Disconnect the ECM C2 harness connector.

Disconnect the Transmission Solenoid Assembly harness connector.

NOTE: Check connectors - Clean/repair as necessary
Ignition on, engine not running.

Measure the voltage of the (T54) Transmission Temperature Sensor
Signal circuit in the ECM C2 harness connector.

Is the voltage above 0.5 volts?

Yes

>> Repair the (T54) Transmission Temperature Sensor Signal

circuit for a short to voltage.

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

No

>> Go To 3

3.

CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (F856)
5-VOLT SUPPLY CIRCUIT

Turn the ignition off to the lock position.

Measure the resistance between the (T54) Transmission Temperature
Sensor Signal circuit and the (F856) 5-volt Supply circuit in the Trans-
mission Solenoid Assembly harness connector.

Is the resistance above 100k ohms?

Yes

>> Go To 4

No

>> Repair the (T54) Transmission Temperature Sensor Signal

circuit for a short to the (F856) 5-volt Supply circuit.

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

DR/DH

AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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P0713-TRANS TEMP SENSOR VOLTAGE TOO HIGH (CONTINUED)

4.

CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

Measure the resistance of the (T54) Transmission Temperature Sensor
Signal circuit between the ECM C2 harness connector and the Trans-
mission Solenoid Assembly harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 5

No

>> Repair the (T54) Transmission Temperature Sensor Signal

circuit for an open.

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

5.

CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the (K900) Sensor Ground circuit between
the ECM C2 harness connector and the Transmission Solenoid
Assembly harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 6

No

>> Repair the (K900) Sensor Ground circuit for an open.

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

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AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

DR/DH

P0713-TRANS TEMP SENSOR VOLTAGE TOO HIGH (CONTINUED)

6.

CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE
(F856) 5-VOLT SUPPLY CIRCUIT INTERNAL TO THE TRANSMISSION

Remove the Transmission Oil Pan. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE/FLUID - STANDARD PROCE-
DURE)

Disconnect the Governor Pressure Sensor connector internal to the
transmission.

Measure the resistance between the (T54) Transmission Temperature
Sensor Signal circuit and (F856) 5-volt Supply circuit in the Governor
Pressure Sensor connector internal to the transmission.

Is the resistance above 100k ohms?

Yes

>> Go To 7

No

>> Replace the Transmission Solenoid Assembly per the Ser-

vice Information. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 48RE/VALVE BODY - REMOVAL)

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

7.

CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
INTERNAL TO THE TRANSMISSION

Reconnect the Transmission Solenoid Assembly harness connector.

Measure the resistance of the (T54) Transmission Temperature Sensor
Signal circuit between the ECM C2 harness connector and the Gover-
nor Pressure Sensor connector internal to the transmission.

Is the resistance below 5.0 ohms?

Yes

>> Go To 8

No

>> Replace the Transmission Solenoid Assembly per the Ser-

vice Information. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 48RE/VALVE BODY - REMOVAL)

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

DR/DH

AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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