Jeep Grand Cherokee WK. Manual — part 1371
U0121–LOST COMMUNICATION WITH ABS
21 - 294
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
WK
U0121–LOST COMMUNICATION WITH ABS (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE -
SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Every 7 msec. Conditions: 1) Engine speed greater than 500 RPM. 2) Battery voltage greater than 10v but
less than 16v.
•
Set Condition:
CAN C bus messages not received for 10 seconds.
Theory of Operation
Some NGC controllers communicate with other controllers over the CAN C bus. The transmission controller contin-
uously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate
transmission MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the
Transmission Controller, the Engine Controller will light the MIL.
Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic pro-
cedures and for further possible causes.
WK
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
21 - 295
U0141 LOST COMMUNICATION WITH FCM
21 - 296
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
WK
U0141 LOST COMMUNICATION WITH FCM (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE -
SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Every 7 msec. Conditions: 1) Engine speed greater than 500 RPM. 2) Battery voltage greater than 10v but
less than 16v.
•
Set Condition:
CAN C bus messages not received for 10 seconds.
Theory of Operation
Some NGC controllers communicate with other controllers over the CAN C bus. The transmission controller contin-
uously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate
transmission MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the
Transmission Controller, the Engine Controller will light the MIL.
Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic pro-
cedures and for further possible causes.
WK
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
21 - 297
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