Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 235

U1503–IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM

For a complete wiring diagram Refer to Section 8W

•

When Monitored:
Continuously with the ignition on.

•

Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Front Control Module (FCM).

Possible Causes

FCM CAN BUS DTCS

ANTI-LOCK BRAKE MODULE

Diagnostic Test

CHECK IF FCM CAN BUS DTCs ARE PRESENT

With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTCs present?

Yes

>> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag-

nose the appropriate symptom.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

>> Replace the Anti-Lock Brakes Module in accordance with the Service Information.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

STANDARD PROCEDURE

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

APS VERIFICATION TEST

1. Make sure that all accessories are turned off and the battery is fully charged.

2. Make sure that all wiring and components are connected.

3. If the module or the pedal assembly was replaced, reprogram the Adjustable Pedals hard stop.

•

Move the Adjustable Pedals to full forward and continue to apply the switch for 10 seconds to learn the hard
stop.

•

Repeat for the rearward direction.

4. Verify that the Adjustable Pedals System is disabled with the shifter in reverse and with the speed control
engaged.

5. With the scan tool, clear DTCs in all modules.

6. Move the Adjustable Pedals Switch forward and rearward several times.

7. Turn the ignition off for 5 seconds, then turn the ignition on.

8. Using the scan tool, select view DTCs in all modules.

Are there any DTCs present?

Yes

>> The repair is not complete. Refer to the symptom list and perform the appropriate diagnostic procedure.

>> Test complete.

BRAKES - ABS ELECTRICAL DIAGNOSTICS

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ABS VERIFICATION TEST — VER 1

WARNING: Ensure braking capability is available before road testing.

NOTE: If the ABM (Anti-Lock Brake Module), SAS (Steering Angle Sensor), Dynamics Sensor was replaced,
it must be initialized using the scan tool. If not initialized, the ABS indicator will flash continuously with no
DTCs. To initialize the ABM and clear offsets have wheels pointing straight ahead and follow the directions
on the scan tool. The drive test requires a 90° turn. If the Dynamics Sensor was replaced, test drive the
vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 25 km/hr (6 and
15 m.p.h.).
1. Turn the ignition off.

2. Connect all previously disconnected components and connectors.

3. Ensure all accessories are turned off and the battery is fully charged.

4. Ensure that the ignition is on, with the scan tool, erase all Diagnostic Trouble Codes from All modules. Start the
engine and allow it to run for 2 minutes and fully operate the system that was malfunctioning.

5. Turn the ignition off and wait 5 seconds. Turn the ignition on and using the scan tool, read DTCs from all mod-
ules.

6. If any Diagnostic Trouble Codes are present, return to symptom list and trouble shoot new or recurring symptom.

NOTE: For Sensor Signal and Pump Motor faults, the ABM must sense all 4 wheels at 12 km/h (7.5 mph)
before it will extinguish the ABS indicator.

7. If there are no DTCs present after turning ignition on, road test the vehicle for at least 5 minutes. Perform several
anti-lock braking stops.

8. Again, with the scan tool read DTCs. If any DTCs are present, refer to the Table of Contents in the applicable
Section for the diagnostic test procedure and troubleshoot the new or recurring symptom.

9. If there are no Diagnostic Trouble Codes (DTCs) present, and the customer’s concern can no longer be dupli-
cated, the repair is complete.

Are any DTCs present or is the original concern still present?

Yes

>> Repair is not complete, refer to appropriate symptom.

>> Repair is complete.

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

BRAKES - ABS SERVICE INFORMATION

TABLE OF CONTENTS

page

BRAKES - ABS SERVICE INFORMATION

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