2007 Wrangler JK Factory Service Manual 21 - TRANSMISSION AND TRANSFER CASE

DIAGNOSIS AND TESTING

C1404- TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Ignition on. Battery voltage between 9.0 and 16.0 volts.

  • Set Condition:

    The TIPM detects a short to ground on the Transfer Case Position Sensor Signal circuit for 2.0 seconds.


Possible Causes
  
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
  
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO (K91) SENSOR GROUND CIRCUIT
  
TRANSFER CASE (4WD) SWITCH
  
TOTALLY INTEGRATED POWER MODULE (TIPM)
  



Diagnostic Test

1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.2 VOLTS

Ignition on, engine not running.
With the scan tool under TIPM, read the T-Case Position Sensor voltage.

Is the voltage below 0.2 volts?

Yes


No

2. (T313) MODE SENSOR SIGNAL CIRCUIT VOLTAGE BELOW 4.9 VOLTS



Turn the ignition off to the lock position.
Disconnect the Transfer Case (4WD) Switch harness connector.
Ignition on, engine not running.
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 below 4.9 volts?

Yes


No

3. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND



Turn the ignition off to the lock position.
Disconnect the TIPM C1 harness connector.
Measure the resistance between ground and the (T313) Mode Sensor Signal circuit at the Transfer Case (4WD) Switch harness connector.

Is the resistance below 5.0 ohms?

Yes


No

4. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO (K91) SENSOR GROUND CIRCUIT



Measure the resistance between the (T313) Mode Sensor Signal circuit and the (K91) Sensor Ground circuit at the Transfer Case (4WD) Switch harness connector.

Is the resistance below 5.0 ohms?

Yes


No

5. 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


No

C1405- TRANSFER CASE RANGE POSITION SENSOR CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on. Battery voltage between 9.0 and 16.0 volts

  • Set Condition:

    The TIPM detects 5.0 volts on the Transfer Case Range Position Sensor Signal circuit for 2.0 seconds when voltage should not be present.


Possible Causes
  
(T313) MODE SENSOR SIGNAL CIRCUIT OPEN
  
(K91) SENSOR GROUND CIRCUIT OPEN
  
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
  
TRANSFER CASE (4WD) SWITCH
  
TOTALLY INTEGRATED POWER MODULE (TIPM)
  



Diagnostic Test

1. T-CASE POSITION SENSOR VOLTAGE ABOVE 4.8 VOLTS

Ignition on, engine not running.
With the scan tool under TIPM, read the T-Case Position sensor voltage.

Is the voltage above 4.8 volts?

Yes


No

2. (T313) MODE SENSOR SIGNAL CIRCUIT VOLTAGE



Turn the ignition off to the lock position.
Disconnect the Transfer Case (4WD) Switch harness connector.
Ignition on, engine not running.
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 and 5.2 volts?

Yes


No

3. (T313) MODE SENSOR SIGNAL CIRCUIT OPEN



Turn the ignition off to the lock position.
Disconnect the TIPM C1 harness connector.
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


No

4. (K91) SENSOR GROUND CIRCUIT OPEN



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


No

5. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE



Ignition on, engine not running.
Measure the voltage of the (T313) Mode Sensor Signal circuit at the Transfer Case (4WD) Switch harness connector.

Is the voltage above 0.2 volts?

Yes


No

6. (K91) SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE



Measure the voltage of the (K91) Sensor Ground circuit at the Transfer Case (4WD) Switch harness connector.

Is the voltage above 0.2 volts?

Yes


No

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.

Were any problems found?

Yes


No