Dodge Dakota (ND). Manual — part 794
U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition run time is greater than 1 second. Battey voltage between 9 and 16 volts.
•
Set Condition:
The PCM doesn’t receive a FCM message over the CAN C circuit for 7 consecutive seconds. The circuit is
continuously monitored.
Possible Causes
CAN C BUS OPEN OR SHORTED CONDITION
FRONT CONTROL MODULE
PCM
Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic
procedures and for further possible causes.
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read PCM DTCs.
Is the DTC active at this time?
Yes
>> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diag-
nostic procedures and for further possible causes.
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 714
ENGINE ELECTRICAL DIAGNOSTICS
ND
U110E-LOST AMBIENT TEMPERATURE MESSAGE
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 715
U110E-LOST AMBIENT TEMPERATURE MESSAGE (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
The PCM doesn’t receive the ambient temperature signal over the CAN C bus from the FCM. The circuit is
continuously monitored.
Possible Causes
CAN C BUS CIRCUIT OPEN OR SHORTED
FRONT CONTROL MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Theory of Operation
The ambient temperature sensor signal is a direct input to the FCM. The FCM sends the PCM the ambient tem-
perature signal over the CAN C bus.
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With the scan tool read Powertrain DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE ALSO ACTIVE
With the scan tool read DTCs.
Is the U0141-NO BUS MESSAGE RECEIVED FROM THE FCM also set?
Yes
>> Follow the daignostics for U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 716
ENGINE ELECTRICAL DIAGNOSTICS
ND
U1110-LOST VEHICLE SPEED MESSAGE
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 717
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