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Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 1243
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When Monitored:
Ignition on.
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Set Condition:
The PCM doesn’t receive a vehicle speed signal from the Anti-lock brake Module or FCM (NON-ABS) over the
CAN C bus.
Possible Causes
CAN C BUS CIRCUIT OPEN OR SHORTED
ANTI-LOCK BRAKE MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Theory of Operation
The PCM receives the vehicle speed signal over the CAN C bus from the Anti-lock Brake Module or FCM (NON-
ABS).
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 the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
U0121-LOST COMMUNICATION WITH ABS MODULE/P0141–LOST COMMUNICATION WITH FCM ALSO
SET
NOTE: If the vehicle is not equipped with ABS the VSS signal will come from the FCM.
With the scan tool, read the appropriate module for DTCs.
Is the U0121-LOST COMMUNICATION WITH ABS MODULE/PO141–Lost Communicate With FCM also
set?
Yes
>> Perform the appropriate diagnostic test.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 996
ENGINE ELECTRICAL DIAGNOSTICS
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