Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 367
*NO RESPONSE FROM ECM (ENGINE CONTROL MODULE) - DIESEL
For a complete wiring diagram Refer to Section 8W.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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Possible Causes
ENGINE CONTROL MODULE POWER AND GROUND
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
ENGINE CONTROL 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 and any ignition related DTCs, perform DTCs 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.
CHECK ECM POWER AND GROUND
Check the ECM power and ground circuits. Refer to 9 - ENGINE ELECTRICAL DIAGNOSTICS - DIESEL for the
diagnostic test procedure.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM VERIFICATION TEST.
No
>> Go To 3
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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3.
(D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the FCM C1 harness connector.
Disconnect the ECM C2 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the
FCM connector and the ECM connector.
Is resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (D65) CAN C Bus (+) circuit for an open.
Perform the ECM VERIFICATION TEST.
4.
(D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between the
FCM connector and the ECM connector.
Is resistance below 5.0 ohms?
Yes
>> Replace and program the Engine Control Module in accor-
dance with the service information.
Perform the ECM VERIFICATION TEST.
No
>> Repair the (D64) CAN C Bus (-) circuit for an open.
Perform the ECM VERIFICATION TEST.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM EOM (ELECTRONIC OVERHEAD MODULE)
For a complete wiring diagram Refer to Section 8W.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 161
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