Dodge Ram Truck 1500-2500-3500. Manual — part 1721
P0712-TRANS TEMP SENSOR VOLTAGE TOO LOW (DIESEL) (CONTINUED)
4.
CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO
GROUND INSIDE TRANSMISSION
Remove the Transmission Oil Pan per the Service Information. (Refer
to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE/FLUID -
STANDARD PROCEDURE)
Disconnect the Governor Pressure Sensor connector interal to the
transmission.
Measure the resistance between ground and the (T54) Transmission
Temperature Sensor Signal circuit at the Governor Pressure Sensor
connector.
Is the resistance above 100k ohms?
Yes
>> Go To 5
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)
5.
CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (K900)
SENSOR GROUND CIRCUIT INSIDE TRANSMISSION
Measure the resistance between the (T54) Transmission Temperature
Sensor Signal circuit and (K900) Sensor Ground circuit at the Gover-
nor Pressure Sensor connector.
Is the resistance above 100k ohms?
Yes
>> Go To 6
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)
21 - 816
AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS
DR/DH
P0712-TRANS TEMP SENSOR VOLTAGE TOO LOW (DIESEL) (CONTINUED)
6.
TRANSMISSION TEMPERATURE SENSOR
TYPICAL VALUES FOR TRANSMISSION TEMPERATURE SENSOR
TEMPERATURE
MIN TO MAX OHM RANGE
-40° C (-40° F)
1094 to 1176 ohms
0.0° C (32° F)
1587 to 1672 ohms
25° C (77° F)
1960 to 2040 ohms
70° C (158° F)
2709 to 2860 ohms
0° C (212° F)
3284 to 3500 ohms
120° C (120° F)
3684 to 3950 ohms
150° C (302° F)
4110 to 4450 ohms
Measure the resistance of the Transmission Temperature Sensor between the (T54) Transmission Temperature Sen-
sor Signal circuit and (K900) Sensor Ground circuit.
Using the chart above, compare the Temperature Sensor temperature to the correlating resistance value.
Is the resistance below the minimum specification for the sensor temperature?
Yes
>> Replace the Governor Pressure/Transmission Temperature Sensor per the Service Information. (Refer to
21
- TRANSMISSION/TRANSAXLE/AUTOMATIC
-
48RE/GOVERNOR
PRESSURE
SENSOR
-
REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No
>> Go To 7
DR/DH
AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS
21 - 817
P0712-TRANS TEMP SENSOR VOLTAGE TOO LOW (DIESEL) (CONTINUED)
7.
ENGINE CONTROL MODULE
Reconnect the all disconnected connectors.
Ignition on, engine not running.
With the scan tool, erase Engine DTCs.
With the scan tool, monitor Engine DTC’s.
Disconnect the Transmission Temperature Sensor connector.
Did the DTC P0713 set?
Yes
>> Go To 8
No
>> Replace and program the Engine Control Module per the Service Information.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
8.
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 origionaly 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 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No
>> Test Complete.
21 - 818
AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS
DR/DH
P0713-TRANS TEMP SENSOR VOLTAGE TOO HIGH
DR/DH
AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS
21 - 819
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