Dodge Ram Truck 1500-2500-3500. Manual — part 1715
P1765-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT (GAS)
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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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P1765-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT (GAS) (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
Theory of Operation
The Transmission Control Relay supplies power to the TCC, Overdrive, and Governor Pressure Solenoids when in
normal operating mode. The Transmission Control Relay Control circuit is constantly monitored by the PCM. If the
expected state of the Transmission Control Relay Control circuit is different then the expected state, a correspond-
ing DTC will set and the PCM will de-energize the Transmission Control Relay and place the transmission in Limp-
in.
•
When Monitored:
Continuously with the Ignition on.
•
Set Condition:
This DTC will set if the PCM monitored voltage of the Transmission Control Relay Control circuit is different
than the expected voltage for the period 3.0 seconds.
Possible Causes
FUSED B(+) CIRCUIT OPEN
(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN
(K125) GENERATOR SOURCE CIRCUIT OPEN
(T515) TRANSMISSION CONTROL RELAY CONTROL SHORT TO VOLTAGE
(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND
(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO ANOTHER CIRCUIT
TRANSMISSION CONTROL RELAY
POWERTRAIN 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 11
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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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P1765-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT (GAS) (CONTINUED)
2.
TRANSMISSION CONTROL RELAY NOT CLICKING
With the scan tool, actuate the Transmission Control Relay.
Is the Transmission Control Relay clicking?
Yes
>> Go To 11
No
>> Go To 3
3.
CHECK THE TRANSMISSION CONTROL RELAY
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
NOTE: Check connectors - Clean/repair as necessary.
Install a substitute relay in place of the Transmission Control Relay.
Ignition on, engine not running.
With the scan tool, erase DTCs.
Start the engine.
With the scan tool, read Engine DTCs.
Does the scan tool display the DTC P1765?
Yes
>> Go To 4
No
>> Replace the Transmission Control Relay.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
4.
CHECK THE FUSED B(+) CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Fused B(+)
circuit in the Transmission Control Relay connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
>> Go To 5
No
>> Repair the Fused B(+) circuit for an open. If the fuse is
open, make sure to check for a short to ground.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCE-
DURE)
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AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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P1765-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT (GAS) (CONTINUED)
5.
CHECK THE (K125) GENERATOR SOURCE CIRCUIT FOR AN OPEN
Using a 12-volt test light connected to ground, check the (K125) Gen-
erator Source circuit in the Transmission Control Relay connector.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Repair the (K125) Generator Source circuit for an open.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (GAS). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
6.
CHECK THE (T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the PCM C2 harness connector.
Ignition on, engine not running.
Measure the voltage of the (T515) Transmission Control Relay Control
circuit in the Transmission Control Relay connector.
Is the voltage above 1.0 volts?
Yes
>> Repair the (T515) Transmission Control Relay Control cir-
cuit 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 7
DR/DH
AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS
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