Jeep Grand Cherokee WK. Manual — part 1441
P1636-TCM INTERNAL- EXTERNAL WATCHDOG PERFORMANCE
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P1636-TCM INTERNAL- EXTERNAL WATCHDOG PERFORMANCE (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. This
DTC indicates that watch dog circuitry external to the microprocessor has detected an error. If the TCM watch dog
circuitry external to the microprocessor detects an error, the controller will enter Limp-in mode and illuminate the
MIL.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
If the TCM watch dog circuitry external to the microprocessor detects an error.
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.
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 575
P1637-TCM INTERNAL-EEPROM PERFORMANCE
21 - 576
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P1637-TCM INTERNAL-EEPROM PERFORMANCE (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. This
DTC indicates that there is an internal error with the controllers Random Access Memory. 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 indicates that there is an internal error with the controllers Random Access Memory.
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.
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 577
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