Jeep Grand Cherokee WK. Manual — part 1540
C2112–DRIVETRAIN SENSOR SUPPLY CIRCUIT HIGH (FDCM)
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C2112–DRIVETRAIN SENSOR SUPPLY CIRCUIT HIGH (FDCM) (CONTINUED)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module detects that the Drivetrain Sensor Supply voltage is above 7.5 volts for 300
mS
Possible Causes
INTERMITTENT DRIVETRAIN SENSOR SUPPLY CIRCUIT HIGH
DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
5 VOLT SUPPLY (REFERENCE) VOLTAGE IS ABOVE 5.2 VOLTS
Ignition on.
With the scan tool, select Data Display in the FDCM.
Monitor the 5 Volt Supply (Reference) Voltage.
Is the voltage above 5.2 volts?
Yes
>> Go to 2
No
>> Go to 4
2.
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Transfer Case Motor harness connector.
Disconnect the Final Drive Control Module C2 harness connector.
Turn the ignition on.
Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit.
Is there any voltage present?
Yes
>> Repair the (K504) Drivetrain 5 Volt Supply circuit for a
short to voltage.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go to 3
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
21 - 971
C2112–DRIVETRAIN SENSOR SUPPLY CIRCUIT HIGH (FDCM) (CONTINUED)
3.
FINAL DRIVE CONTROL MODULE
View repair.
Repair
Replace the Final Drive Control Module in accordance with the Service information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
4.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
>> Repair as necessary.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Test complete.
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C2113–DRIVETRAIN SENSOR SUPPLY VOLTAGE CIRCUIT OPEN (FDCM)
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
21 - 973
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