Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1913
U1402-IMPLAUSIBLE ENGINE TEMPERATURE SIGNAL RECEIVED
For a complete wiring diagram Refer to Section 8W
21 - 186
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
LX
Theory of Operation
The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a
certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of
bytes for each ID.
•
When Monitored:
Continuously with the ignition on, one valid CAN ID received at least once, and no U0002-CAN Bus Off Per-
formance DTC present.
•
Set Condition:
When the TCM detects an incorrect CAN ID from the ECM/PCM.
Possible Causes
FCM CAN BUS DTC’S PRESENT
ECM/PCM DTC’S PRESENT
TRANSMISSION CONTROL MODULE
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
CHECK FOR FCM CAN BUS DTCS
With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTC’s present?
Yes
>> Refer to 8-ELECTRICAL - ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS cate-
gory and perform the appropriate symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 2
2.
CHECK IF ENGINE DTC’S ARE PRESENT
With the scan tool, read engine DTCs.
Are there any engine DTC’s present?
Yes
>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
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 - 187
U1404-IMPLAUSIBLE STATIC ENGINE TORQUE SIGNAL RECEIVED
For a complete wiring diagram Refer to Section 8W
21 - 188
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
LX
Theory of Operation
The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a
certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of
bytes for each ID.
•
When Monitored:
Continuously with the ignition on, one valid CAN ID received at least once, and no U0002-CAN Bus Off Per-
formance DTC present.
•
Set Condition:
When the TCM detects an incorrect CAN ID from the ECM/PCM.
Possible Causes
FCM CAN BUS DTC’S PRESENT
ECM/PCM DTC’S PRESENT
TRANSMISSION CONTROL MODULE
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
CHECK FOR FCM CAN BUS DTCS
With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTC’s present?
Yes
>> Refer to 8-ELECTRICAL - ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS cate-
gory and perform the appropriate symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 2
2.
CHECK IF ENGINE DTC’S ARE PRESENT
With the scan tool, read engine DTCs.
Are there any engine DTC’s present?
Yes
>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
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 - 189
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