Jeep Grand Cherokee WK. Manual — part 1415
P0602-CONTROL MODULE PROGRAMMING ERROR/NOT PROGRAMMED (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
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.
CHECK IF TCM IS FLASHABLE
NOTE: Controller is programmed with generic software and will not allow the correct vehicle Powertrain
management.
With the scan tool, record the vehicles controller part number.
Select Use Controller Part Number under the Flash Tab.
Flash the controller with the correct software.
Were you able to update (flash) the controller successfully?
Yes
>> Test Complete.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Replace the TCM per the Service Information. Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/TRANSMISSION CONTROL MODULE for the appropriate service procedures.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P0604-INTERNAL CONTROL MODULE RAM
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 471
P0604-INTERNAL CONTROL MODULE RAM (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
Theory of Operation
The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the
TCM detects an error with the controllers Random Access Memory (RAM), 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 error with the controllers Random Access Memory (RAM).
Possible Causes
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.
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 CON-
TROL MODULES/TRANSMISSION CONTROL MODULE for the appropriate service procedures.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P0605-INTERNAL CONTROL MODULE ROM
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 473
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