C1404-TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Ignition on with battery voltage between 9.0 Volts and 16.0 Volts.
Set Condition:
The Totally Integrated Power Module (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)

1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.2 VOLTS

1.	Ignition on, engine not running.

2.	With the scan tool under TIPM, read the T-Case Position Sensor voltage.

Is the voltage below 0.2 of a volt?

Yes

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

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 below 4.9 volts?

Yes

Replace the Transfer Case (4WD) Switch in accordance with the Service Information.
Perform the BODY VERIFICATION TEST.

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

1.	Turn the ignition off to the lock position.

2.	Disconnect the TIPM C1 harness connector.

3.	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

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

1.	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

Repair the (T313) Mode Sensor Signal circuit for a short to the (K91) Sensor Ground circuit.
Perform the BODY VERIFICATION TEST.

Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
Perform the BODY VERIFICATION TEST.

5. 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