P0836-TRANSFER CASE POSITION SENSOR SIGNAL VOLTAGE TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on. No other T-Case Position Sensor DTC's present.
Set Condition:
The Transfer Case Position Sensor Signal is above 4.8 volts for 0.5 second.

Possible Causes

TRANSFER CASE POSITION SENSOR

INTERMITTENT WIRING AND CONNECTORS

TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT OPEN

TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO GROUND

TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO SENSOR GROUND CIRCUIT

ENGINE CONTROL MODULE

Diagnostic Test

1.CHECKING FOR CURRENT DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

NOTE: The vehicle speedometer must be operational for the result of this test to be valid.

Does the scan tool display this DTC?

Yes

Go To2

Go To7

2.TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

Is the voltage above 1.0 volt?

Yes

Repair the Transfer Case Position Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To3

3.TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To4

Repair the Transfer Case Position Sensor Signal circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO GROUND

Is the resistance below 1000.0 ohms?

Yes

Repair the Transfer Case Position Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To5

5.TRANSFER CASE POSITION SENSOR SIGNAL CIRCUIT SHORT TO SENSOR RETURN CIRCUIT

Is the resistance below 1000.0 ohms?

Yes

Repair the Transfer Case Position Sensor Signal circuit for a short to the Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To6

6.TRANSFER CASE POSITION SENSOR

NOTE: When shifting the transfer case selector to each position, the Sensor voltage should result in the following voltages: 2WD 2.64 - 2.80, 4WD Part Time 1.96 - 2.12, 4WD Full Time 1.39 - 1.55, Neutral 0.80 - 0.96, 4WD Low 0.21 - 0.37,

Does each position provide the correct voltage?

Yes

Replace and program the ECM in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Replace the Transfer Case Position Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

7.INTERMITTENT WIRING AND CONNECTORS

Were there any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Test Complete.