Jeep Grand Cherokee WK. Manual — part 1529
C1408-TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH (CONTINUED)
3.
(T317) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT SHORTED TO THE (T301) SWITCHED
BATTERY SOLENOID SUPPLY CIRCUIT
Measure the resistance between the (T317) Transfer Case Motor Lock
Signal circuit and the (T301) Switched Battery Solenoid Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T317) Transfer Case Motor Lock Signal circuit
for a short to the (T301) Switched Battery Solenoid Supply
circuit.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go to 4
4.
TRANSFER CASE MOTOR
Turn the ignition off.
Connect the Final Drive Control Module C1 harness connector.
Turn the ignition on.
With the scan tool, Clear DTCs.
With the scan tool, select View DTCs.
Does the DTC P1407–Transfer Case Brake Control Circuit Low set?
Yes
>> Replace the Transfer Case Motor assembly.
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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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C1408-TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH (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.
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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C140A- TRANSFER CASE MOTOR PERFORMANCE
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C140A- TRANSFER CASE MOTOR PERFORMANCE (CONTINUED)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on and no undervoltage or overvoltage condition present.
•
Set Condition:
A faulted condition is detected in the H-bridge driver.
Possible Causes
INTERMITTENT TRANSFER CASE MOTOR PERFORMANCE DTC
(T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE
(T316) SHIFT MOTOR CONTROL B CIRCUIT SHORTED TO VOLTAGE
(T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO GROUND
(T316) SHIFT MOTOR CONTROL B CIRCUIT SHORTED TO GROUND
(T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B CIRCUIT
TRANSFER CASE MOTOR
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go to 2
No
>> Go to 9
2.
(T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Transfer Case Motor harness connector.
Disconnect the Final Drive Control Module C1 harness connector.
Turn the ignition on.
Measure the voltage of the (T315) Shift Motor Control A circuit.
Is there any voltage present?
Yes
>> Repair the (T315) Shift Motor Control A circuit for a short
to voltage.
Perform the TRANSFER CASE VERIFICATION TEST-
VER 1.
No
>> Go to 3
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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