Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1895
P1639-TCM INTERNAL-CAN 2 RAM PERFORMANCE
For a complete wiring diagram Refer to Section 8W
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
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Theory of Operation
The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. This
DTC indicates that there is an internal error with the controllers Random Access Memory (RAM) on the CAN con-
troller 2 section of the microprocessor. If detected, the controller will enter Limp-in mode and illuminate the MIL.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
If the TCM detects an internal error with the controllers Random Access Memory (RAM) on the CAN controller
2 section of the microprocessor.
Possible Causes
TRANSMISSION CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
TRANSMISSION CONTROL MODULE
View repair
Repair
Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the TCM per the Service Information. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/TRANSMISSION CONTROL MODULE - DESCRIPTION)
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
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P1644-INCORRECT VARIANT/CONFIGURATION
For a complete wiring diagram Refer to Section 8W
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
LX
Theory of Operation
The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the
TCM detects that the variables that dictate the vehicle application are not present, the controller will enter Limp-in
mode and illuminate the MIL.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
If the TCM detects that the variables that dictate the vehicle application are not present.
Possible Causes
CONTROLLER NOT CODED
TRANSMISSION CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
PERFORM TCM REPLACEMENT PROCEDURE
NOTE: Controller is programmed with generic software and will not allow the correct vehicle Powertrain
management.
With the scan tool, perform the TCM replacement procedure.
Were you able to update the controller successfully?
Yes
>> Test Complete.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the TCM per the Service Information. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/TRANSMISSION CONTROL MODULE - DESCRIPTION)
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
LX
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 117
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