Jeep Grand Cherokee WK. Manual — part 1521
C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH (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:
Transfer Case 4WD Range Switch voltage is greater than a specified voltage for a calibrated amount of time.
Possible Causes
INTERMITTENT TRANSFER CASE RANGE SELECTOR SWITCH CIRCUIT HIGH
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE
TRANSFER CASE SELECTOR SWITCH (Z907) GROUND CIRCUIT OPEN
TRANSFER CASE SELECTOR SWITCH
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
4WD RANGE SWITCH VOLTAGE ABOVE 4.5 VOLTS
Ignition on, engine not running.
NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding.
With the scan tool under Data Display, read the 4WD Range Switch voltage.
Is the voltage above 4.5 volts?
Yes
>> Go To 2
No
>> Go to 7
2.
TRANSFER CASE SELECTOR SWITCH
Turn the ignition off.
Disconnect the Transfer Case Selector Switch harness connector.
Ignition on, engine not running.
With the scan tool under Data Display, read the 4WD Range Switch voltage.
Is the voltage equal to 0 volts?
Yes
>> Replace the Transfer Case Selector Switch.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Go to 3
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH (CONTINUED)
3.
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit.
Is the voltage above 5.5 volts?
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 4
4.
(K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Final Drive Control Module C2 harness connector.
Turn the ignition on.
Measure the voltage of the (K977) Mode Select circuit.
Is there any voltage present?
Yes
>> Repair the (K977) Mode Select circuit for a short to volt-
age.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go to 5
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH (CONTINUED)
5.
TRANSFER CASE SELECTOR SWITCH (Z907) GROUND CIRCUIT OPEN
Measure the resistance between ground and the Transfer Case Selec-
tor Switch (Z907) Ground circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Transfer Case Selector Switch (Z907) Ground
circuit for an open.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go To 6
6.
FINAL DRIVE CONTROL MODULE
Repair
Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
7.
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.
While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
Look for the data to change other than as expected or for the DTC to reset.
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
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