Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

T-CASE POSITION SENSOR VOLTAGE ABOVE 4.8 VOLTS
1. Ignition on, engine not running.
2. With the scan tool under TIPM, read the T-Case Position sensor voltage.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go To 2
  No
  - Go To 7
(T313) MODE SENSOR SIGNAL CIRCUIT VOLTAGE
1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case (4WD) Switch harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (T313) Mode Sensor Signal circuit and the (K91) Sensor Ground at the Transfer Case (4WD) Switch harness connector.
  Is the voltage between 4.8 volts and 5.2 volts?
  
  Yes
  - Replace the Transfer Case (4WD) Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST.
  No
  - Go To 3
Fig 1: Measuring Voltage Of Mode Sensor Signal Circuit & Sensor Ground
Courtesy of CHRYSLER GROUP, LLC
(T313) MODE SENSOR SIGNAL CIRCUIT OPEN
1. Turn the ignition off to the lock position.
2. Disconnect the TIPM C1 harness connector.
3. Measure the resistance of the (T313) Mode Sensor Signal circuit between the Transfer Case (4WD) Switch harness connector and the TIPM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for an open.
  - Perform the BODY VERIFICATION TEST.
  No
  - Go To 4
Fig 2: Measuring Resistance Of Mode Sensor Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
(K91) SENSOR GROUND CIRCUIT OPEN
1. Measure the resistance of the (K91) Sensor Ground circuit between the Transfer Case (4WD) Switch harness connector and the TIPM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (K91) Sensor Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST.
  No
  - Go To 5
Fig 3: Measuring Resistance Of Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Ignition on, engine not running.
2. Measure the voltage of the (T313) Mode Sensor Signal circuit at the Transfer Case (4WD) Switch harness connector.
  Is the voltage above 0.2 of a volt?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST.
  No
  - Go To 6
Fig 4: Measuring Voltage Of Mode Sensor Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
(K91) SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
1. Measure the voltage of the (K91) Sensor Ground circuit at the Transfer Case (4WD) Switch harness connector.
  Is the voltage above 0.2 of a volt?
  
  Yes
  - Repair the (K91) Sensor Ground circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST.
  No
  - Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST.
Fig 5: Measuring Voltage Of Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
4. 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 BODY VERIFICATION TEST.
  No
  - Test complete.