Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1242

•

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 the 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 diagnostics for U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Replace and program the Powertrain Control Module per Service Information.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

9 - 992

ENGINE ELECTRICAL DIAGNOSTICS

LX

U110F-LOST FUEL VOLUME MESSAGE

For a complete wiring diagram Refer to Section 8W.

LX

ENGINE ELECTRICAL DIAGNOSTICS

9 - 993

•

When Monitored:
Ignition on.

•

Set Condition:
When the PCM does not receive a fuel volume signal from the FCM over the CAN C circuit. The circuit is
constantly 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 fuel level signal is a direct input to the Cluster. The fuel level signal is sent to the FCM over the CAN B bus
circuit. The NGC receives the fuel level signal from the FCM over the CAN C bus circuit.

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.

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 diagnostics for U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE

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 - 994

ENGINE ELECTRICAL DIAGNOSTICS

LX

U1110-LOST VEHICLE SPEED MESSAGE

For a complete wiring diagram Refer to Section 8W.

LX

ENGINE ELECTRICAL DIAGNOSTICS

9 - 995