Jeep Grand Cherokee WK. Manual — part 1518
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
TRANSFER CASE - ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
TRANSFER CASE VERIFICATION TEST VER
1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 883
C1400-TRANSFER CASE RANGE SELECT
SWITCH PERFORMANCE . . . . . . . . . . . . . . 884
C1401-TRANSFER CASE RANGE SELECT
SWITCH CIRCUIT LOW . . . . . . . . . . . . . . . . 889
C1402-TRANSFER CASE RANGE SELECT
SWITCH CIRCUIT HIGH . . . . . . . . . . . . . . . . 894
C1403-TRANSFER CASE RANGE POSITION
SENSOR PERFORMANCE . . . . . . . . . . . . . . 898
C1404-TRANSFER CASE RANGE POSITION
SENSOR CIRCUIT LOW . . . . . . . . . . . . . . . . 905
C1405-TRANSFER CASE RANGE POSITION
SENSOR CIRCUIT HIGH . . . . . . . . . . . . . . . 909
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 914
C1407-TRANSFER CASE BRAKE CONTROL
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . 919
C1408-TRANSFER CASE BRAKE CONTROL
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 924
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 928
CONTROL CIRCUIT OPEN . . . . . . . . . . . . . . 933
BLOCKED . . . . . . . . . . . . . . . . . . . . . . . . . . 937
C140F-TRANSFER CASE RANGE POSITION
SENSOR ERRATIC PERFORMANCE . . . . . . 939
C1413–4 HI/LO SELECT SWITCH CIRCUIT
STUCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 947
CIRCUIT STUCK . . . . . . . . . . . . . . . . . . . . . 950
CURRENT PERFORMANCE . . . . . . . . . . . . . 953
OVERUSE . . . . . . . . . . . . . . . . . . . . . . . . . . 955
C2100–BATTERY VOLTAGE LOW (FDCM)
C2101–BATTERY VOLTAGE HIGH (FDCM)
C2109–DRIVETRAIN SUPPLY VOLTAGE
CIRCUIT LOW (FDCM) . . . . . . . . . . . . . . . . . 963
C2111–DRIVETRAIN SENSOR SUPPLY
CIRCUIT LOW (FDCM) . . . . . . . . . . . . . . . . . 966
C2112–DRIVETRAIN SENSOR SUPPLY
CIRCUIT HIGH (FDCM) . . . . . . . . . . . . . . . . 970
C2113–DRIVETRAIN SENSOR SUPPLY
VOLTAGE CIRCUIT OPEN (FDCM) . . . . . . . . 973
C2201-INTERNAL CONTROLLER (FDCM)
C2206-CONFIGURATION ERROR (FDCM)
C230A-NEUTRAL INDICATOR CONTROL
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . 978
C230B- NEUTRAL INDICATOR CONTROL
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 982
U0401–IMPLAUSIBLE DATA RECEIVED
FROM ECM (FDCM) . . . . . . . . . . . . . . . . . . . 986
U0402–IMPLAUSIBLE DATA RECEIVED
FROM TCM (FDCM) . . . . . . . . . . . . . . . . . . . 987
U0415–IMPLAUSIBLE DATA RECEIVED
FROM ABS (FDCM) . . . . . . . . . . . . . . . . . . . 988
U0429–IMPLAUSIBLE DATA RECEIVED
FROM SCM (FDCM) . . . . . . . . . . . . . . . . . . . 989
U0431–IMPLAUSIBLE DATA RECEIVED
FROM FCM (FDCM) . . . . . . . . . . . . . . . . . . . 990
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
21 - 882
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
TRANSFER CASE VERIFICATION TEST VER 1
Diagnostic Test
1.
TRANSFER CASE VERIFICATION TEST— VER 1
Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
With the scan tool, select Clear Stored DTCs.
Make sure that all accessories are turned off and that the battery is fully charged.
Test drive the vehicle in each Transfer Case range and verify proper operation in each range.
NOTE: To select or deselect 4LO (if equipped), vehicle speed must be below 3 M.P.H. (5 KM/H) with the
ignition ON and the transmission in neutral (auto trans).
NOTE: To select or deselect Transfer Case Neutral, vehicle speed must be 0 M.P.H. with the ignition ON,
engine OFF, the brake pedal applied, and the transmission in neutral (auto trans). Press the Neutral button
(if equipped) on the Transfer Case Selector Switch until the Neutral Indicator is illuminated solidly and the
cluster displays ’4WD System in Neutral’.
WARNING: Apply the parking brake. The vehicle may roll with the Transfer Case in neutral.
NOTE: To verify that the Transfer Case is in Neutral, shift the automatic transmission into reverse and
release the brake pedal for three seconds. There should be no vehicle movement if the Transfer Case is in
Neutral.
With the scan tool, select View DTCs in the Final Drive Control Module.
Are there any DTCs present in the Final Drive Control Module?
Yes
>> Return to the symptom list and perform the appropriate diagnostic test.
No
>> Repair is complete.
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
21 - 883
C1400-TRANSFER CASE RANGE SELECT SWITCH PERFORMANCE
21 - 884
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
C1400-TRANSFER CASE RANGE SELECT SWITCH PERFORMANCE (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 Transfer Case Selector Switch is not reporting a valid voltage for any switch position.
Possible Causes
INTERMITTENT TRANSFER CASE RANGE SELECT SWITCH PERFORMANCE
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K977) MODE SELECT CIRCUIT OPEN
(K977) MODE SELECT CIRCUIT SHORT TO GROUND
TRANSFER CASE SELECTOR SWITCH
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
DTC IS ACTIVE
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, select View DTCs in the Final Drive Control Module.
Is the DTC status Active at this time?
Yes
>> Go To 2
No
>> Go To 9
2.
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Transfer Case Selector Switch connector.
Turn the ignition on.
Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit.
Is the voltage between 4.7 and 5.2 volts?
Yes
>> Go To 5
No
>> Go To 3
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
21 - 885
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