Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 363
•
When Monitored:
When the scan tool queries the FCM.
•
Set Condition:
The scan tool has detected an open condition on both CAN C Diagnostic circuits.
Possible Causes
(D72) CAN C DIAGNOSTIC (+) CIRCUIT OPEN
(D71) CAN C DIAGNOSTIC (-) CIRCUIT OPEN
FRONT CONTROL MODULE
Diagnostic Test
1.
CHECK THE STATUS OF THE ERROR MESSAGE
NOTE: Ensure the vehicle being tested is a CAN BUS VEHICLE. If not, false error messages may be dis-
played.
NOTE: Ensure the scan tool is updated to the latest software.
With the scan tool, record the error message.
Disconnect the scan tool from the DLC.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
Does the scan tool display this same error message?
Yes
>> Go To 2
No
>> The conditions that caused this error message to set are not present at this time. Using the wiring dia-
gram/schematic as a guide, inspect the wiring and connectors.
2.
(D72) CAN C DIAGNOSTIC (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Control Module C1 harness connector.
Disconnect the scan tool from the DLC.
NOTE: Check the connectors at both the DLC and the FCM.
Measure the resistance of the (D72) CAN C Diagnostic (+) circuit
between the FCM connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Go To 3
No
>> Repair the (D72) CAN C Diagnostic (+) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
LX
3.
(D71) CAN C DIAGNOSTIC (-) CIRCUIT OPEN
Measure the resistance of the (D71) CAN C Diagnostic (-) circuit
between the FCM connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Inspect the wiring and connectors for damage or shorted
circuits. If ok, replace the Front Control Module in accor-
dance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
No
>> Repair the (D71) CAN C Diagnostic (-) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST – VER 1).
LX
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 143
*NO RESPONSE FROM ABS (ANTILOCK BRAKE MODULE)
For a complete wiring diagram Refer to Section 8W.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
LX
Possible Causes
(A107) (A111) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z903) GROUND CIRCUIT OPEN
(F202) FUSED IGNITION SW OUTPUT CIRCUIT OPEN OR SHORTED
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
ANTILOCK BRAKE MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU View.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active
on the Bus network. A green check indicates that the module is active on the Bus network.
NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.
Does the scan tool display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent, pushed out, and corroded terminals.
2.
(A107) (A111) FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Using a 12-volt test light connected to ground, check each (A107) and
(A111) Fused B(+) circuit.
Does the test light illuminate brightly for each circuit?
Yes
>> Go To 3
No
>> Repair the Fused B(+) circuit for an open or short.
Perform ABS VERIFICATION TEST - VER 1.
LX
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 145
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