Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1246

4.

ACTIVE DTCS IN THE FCM

With the scan tool, select ECU View and select FCM.

With the scan tool, read active DTCs.

Are any Communication DTCs active in the FCM relating to the ABS System?

Yes

>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the

diagnostic procedures.

Perform BODY VERIFICATION TEST – VER 1.

No

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

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

9 - 1008

ENGINE ELECTRICAL DIAGNOSTICS

LX

U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED

For a complete wiring diagram Refer to Section 8W.

LX

ENGINE ELECTRICAL DIAGNOSTICS

9 - 1009

•

When Monitored:
Ignition on.

•

Set Condition:
The PCM gets an implausible signal over the CAN C circuit from the ABS Module or FCM (NON-ABS). The
circuit is continuously monitored.

Possible Causes

VEHICLE SPEED SENSOR FAULT ACTIVE IN ANTI-LOCK BRAKE MODULE

CAN C BUS CIRCUIT SHORTED

CAN C BUS CIRCUIT OPEN

ABS MODULE

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Theory of Operation

The ABS Module or FCM (NON-ABS) sends an implausible distance signal over the CAN C Bus circuit to the PCM.

Diagnostic Test

1.

ACTIVE DTC

NOTE: Diagnose all CAN B and C communication failures before continuing.
Ignition on, engine not running.

With a scan tool, read DTCs.

Is the U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED 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.

ABS MODULE IS ACTIVE ON THE CAN C BUS

With the scan tool, select ECU View.

Verify that the ABS Module active on the bus.

Is the ABS Module active on the bus?

Yes

>> Go To 3

No

>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No

Response diagnostic procedures.

Perform BODY VERIFICATION TEST – VER 1.

3.

DTCS STORED OR ACTIVE IN THE ABS MODULE/FCM (NON-ABS)

Check for wheel speed DTCs in the ABS Module or FCM (NON-ABS).

Are any DTCs active or stored in the ABS Module/FCM?

Yes

>> Refer to the appropriate section and perform the diagnostics for the DTCs.

Perform ABS VERIFICATION TEST – VER

No

>> Go to 4

9 - 1010

ENGINE ELECTRICAL DIAGNOSTICS

LX

4.

ACTIVE DTCS IN THE FCM

With the scan tool, select ECU View and select FCM.

With the scan tool, read active DTCs.

Are any Communication DTCs active in the FCM relating to the ABS System?

Yes

>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the

diagnostic procedures.

Perform BODY VERIFICATION TEST – VER 1.

No

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

Perform POWERTRAIN VERIFICATION TEST – VER 5.

LX

ENGINE ELECTRICAL DIAGNOSTICS

9 - 1011