Dodge Ram Truck 1500-2500-3500. Manual — part 1718
STANDARD PROCEDURE
PRE-DIAGNOSTIC TROUBLE SHOOTING PROCEDURE - 48RE GAS
For a complete wiring diagramRefer to Section 8W
1.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and
repair the leak then check and adjust the fluid level per the Service Information.
With the scan tool, read engine DTC’s. Check and repair all engine DTCs prior to performing transmission symptom
diagnostics.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.
Verify the flash level of the Powertrain Control Module. Some problems are corrected by software upgrades.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Did any of the above checks or procedures correct the symptom?
Yes
>> Repair is complete.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No
>> Refer to the Transmission category and perform the appropriate symptom(s). (Refer to 21 - TRANS-
MISSION/TRANSAXLE/AUTOMATIC - 48RE - DIAGNOSIS AND TESTING)
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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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PRE-DIAGNOSTIC TROUBLE SHOOTING PROCEDURE - 48RE GAS (CONTINUED)
TRANSMISSION VERIFICATION TEST VER - 1 (GAS)
1.
1. Inspect the vehicle to ensure that all engine and transmission components are properly installed and connected.
Reassemble and reconnect components as necessary.
2. If any existing diagnostic trouble codes have not been repaired, go to Symptom List and follow path specified.
3. Connect a scan tool to the data link connector.
4. Ensure the fuel tank has at least a quarter tank of fuel. Turn off all accessories.
5. Start and run the engine until the transmission temperature is above 43°C (110°F).
6. Check the transmission fluid level per the Service Information. Adjust if necessary.
7. Road test the vehicle. Make 15 to 20 1-2, 2-3 and 3-4 up shifts. Perform these shifts from a standing start to 72
km/h (45 MPH) with a constant throttle opening of 20-25%.
8. Below 40 km/h (25 MPH), make 5 to 8 wide open throttle kick downs to 1st gear. Allow at least 5 seconds each
in 2nd and 3rd between each kick down.
9. For a specific DTC, drive the vehicle in accordance with the Symptom’s When Monitored and Set Conditions to
verify the repair.
10. If a DTC sets during the road test, return to the Symptom List and follow the path. If no DTC sets, the repair is
complete.
Are there any DTCs or symptoms remaining?
Yes
>> Repair is not complete, refer to appropriate symptom.
No
>> Repair is complete.
DR/DH
AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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SCHEMATICS AND DIAGRAMS
RE
TRANSMISSION
CIRCUIT
DIAGRAM
(GAS)
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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL
DIAGNOSTICS
TABLE OF CONTENTS
page
page
AUTOMATIC TRANSMISSION - 48RE - DIESEL -
ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
P0711-TRANS TEMP SENSOR, NO TEMP
RISE AFTER START (DIESEL) . . . . . . . . . . . 808
P0712-TRANS TEMP SENSOR VOLTAGE
TOO LOW (DIESEL) . . . . . . . . . . . . . . . . . . . 813
P0713-TRANS TEMP SENSOR VOLTAGE
TOO HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . 819
P0720-LOW OUTPUT SPEED SENSOR -
RPM ABOVE 15 MPH (DIESEL) . . . . . . . . . . 827
P0748-PRESSURE SOL CONTROL/TRANS
RELAY CIRCUITS (DIESEL) . . . . . . . . . . . . . 833
(DIESEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 841
P0868-GOVERNOR PRESSURE SENSOR
VOLTS TOO HI (DIESEL) . . . . . . . . . . . . . . . 846
P0869-GOVERNOR PRESSURE SENSOR
VOLTS TOO LOW (DIESEL) . . . . . . . . . . . . . 853
P0882-TRANS 12 VOLT SUPPLY RELAY
CONTROL CIRCUIT LOW (DIESEL) . . . . . . . 858
P0883-TRANS 12 VOLT SUPPLY RELAY
CONTROL CIRCUIT HIGH (DIESEL) . . . . . . . 864
CIRCUIT VOLTAGE TOO LOW (DIESEL) . . . 868
CIRCUIT VOLTAGE TOO HIGH (DIESEL) . . . 876
(DIESEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
P1749-TRANSMISSION THROTTLE VALVE
POSITION SENSOR CIRCUIT LOW . . . . . . . 886
P1750-TRANSMISSION THROTTLE VALVE
POSITION SENSOR CIRCUIT HIGH . . . . . . . 893
P1751-TRANSMISSION THROTTLE VALVE
POSITION MINIMUM RANGE
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 898
P1752-TRANSMISSION THROTTLE VALVE
SPAN PERFORMANCE . . . . . . . . . . . . . . . . 902
P1753-TRANSMISSION THROTTLE VALVE
MECHANICAL PERFORMANCE . . . . . . . . . . 906
P1754-TRANSMISSION THROTTLE VALVE
ACTUATOR STUCK . . . . . . . . . . . . . . . . . . . 910
P1755-TRANSMISSION THROTTLE VALVE
CONTROL CIRCUIT . . . . . . . . . . . . . . . . . . . 920
TARGET @ 35 - 40 PSI (DIESEL) . . . . . . . . . 928
P1757-GOV PRESS ABOVE 3 PSI IN GEAR
WITH 0 MPH (DIESEL) . . . . . . . . . . . . . . . . . 936
VOLTS TOO LOW OR HIGH (DIESEL) . . . . . 942
P2769-TRANSMISSION TCC CONTROL
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . 948
P2770-TRANSMISSION TCC CONTROL
CIRCUIT HIGH (DIESEL) . . . . . . . . . . . . . . . 955
*TOW /HAUL OVERDRIVE OFF SWITCH
(DIESEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 960
PRE-DIAGNOSTIC CHECKOUT (DIESEL)
TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL) . . . . . . . . . . . . . . . . . . . . . . . . . . 964
AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
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