Dodge Dakota (ND). Manual — part 196
U0027-CAN B BUS (-) SHORTED TO BUS (+) (CONTINUED)
3.
(D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT
Measure the resistance between the (D55) CAN B Bus (+) circuit and
(D54) CAN B Bus (-) circuit.
While monitoring the ohmmeter, disconnect each CAN B Bus module
one at a time.
NOTE: This is to determine if the short together is internal within
a module or if the circuits are shorted together.
NOTE: Disconnecting an in-line connector can eliminate a module
or group of modules from the list of possible causes for this
fault. Refer to the wring diagrams to assist in diagnosis.
Is resistance below 1000.0 ohms with all the CAN B Bus mod-
ules disconnected?
Yes
>> Repair the (D55) CAN B Bus (+) circuit for a short to the
(D54) CAN B Bus (-) circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
No
>> Replace the module that when disconnected the short together was eliminated, in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1).
8E - 40
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
ND
U0100-LOST COMMUNICATION WITH ECM/PCM
ND
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 41
U0100-LOST COMMUNICATION WITH ECM/PCM (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
FCM is configured correctly
•
Set Condition:
Bus messages not received from the ECM/PCM for approximately 2 to 5 seconds.
Possible Causes
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
ECM/PCM POWER AND GROUND
ECM/PCM
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni-
tion related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Index for a complete list of the symptoms.
No
>> Go To 3
3.
VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the ECM/PCM is active on the bus.
Is the ECM/PCM active on the bus?
Yes
>> Go To 4
No
>> Refer to the No Response test procedure. Refer to the table of contents in this section.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
ND
U0100-LOST COMMUNICATION WITH ECM/PCM (CONTINUED)
4.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network Diagnostics.
Is there more than one module with active DTCs “Logged Against” the ECM/PCM?
Yes
>> Replace/update the ECM/PCM in accordance with the service information.
Perform the appropriate VERIFICATION TEST.
No
>> Replace/update the module that set this DTC in accordance with the service information.
Perform the appropriate VERIFICATION TEST.
ND
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 43
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