Jeep Grand Cherokee WK. Manual — part 1539
C2111–DRIVETRAIN SENSOR SUPPLY CIRCUIT LOW (FDCM)
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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C2111–DRIVETRAIN SENSOR SUPPLY CIRCUIT LOW (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 below 2.5 volts for 300
mS.
Possible Causes
INTERMITTENT DRIVETRAIN SENSOR SUPPLY CIRCUIT LOW
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORT TO GROUND
TRANSFER CASE SELECTOR SWIITCH
TRANSFER CASE MOTOR
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
5 VOLT SUPPLY (REFERENCE) VOLTAGE BELOW 4.8 VOLTS
Turn the ignition on.
With the scan tool, select Data Display in the FDCM.
Monitor the 5 Volt Supply (Reference) Voltage.
Is the voltage below 4.8 volts?
Yes
>> Go to 2
No
>> Go to 6
2.
TRANSFER CASE SELECTOR SWITCH
Turn the ignition off.
Disconnect the Transfer Case Selector Switch harness connector.
Turn the ignition on.
With the scan tool, monitor the 5 Volt Supply (Reference) Voltage.
Is the voltage above 4.75 volts with the Transfer Case Selector Switch harness disconnected?
Yes
>> Replace the Transfer Case Selector Switch in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Go to 3
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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C2111–DRIVETRAIN SENSOR SUPPLY CIRCUIT LOW (FDCM) (CONTINUED)
3.
TRANSFER CASE MOTOR
Turn the ignition off.
Disconnect the Transfer Case Motor harness connector.
Turn the ignition on.
With the scan tool, monitor the 5 Volt Supply (Reference) Voltage.
Is the voltage above 4.75 volts with the Transfer Case Motor harness disconnected?
Yes
>> Replace the Transfer Case Motor in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Go to 4
4.
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Final Drive Control Module harness connector.
Measure the resistance between ground and the (K504) Drivetrain 5
Volt Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (K504) Drivetrain 5 Volt Supply circuit for a
short to ground.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go to 5
5.
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.
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C2111–DRIVETRAIN SENSOR SUPPLY CIRCUIT LOW (FDCM) (CONTINUED)
6.
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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