C1460-AWD SWITCH CIRCUIT PERFORMANCE

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 AWD Switch is not reporting a valid voltage for either switch position.

Possible Causes

(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORT TO GROUND

(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORT TO VOLTAGE

(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT OPEN

(Z940) GROUND CIRCUIT OPEN

TRANSFER CASE SELECTOR SWITCH

ALL WHEEL DRIVE (AWD) CONTROL MODULE

1.DTC IS ACTIVE

NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding.

Is the DTC status Active at this time?

Yes

2.TRANSFER CASE SELECTOR SWITCH

Does the voltage display as described?

Yes

3.(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO GROUND

Is the resistance less than 5.0 ohms?

Yes

Repair the (K77) Transfer Case Position Sensor Input circuit for a short to ground.
Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)

4.(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO VOLTAGE

Is the voltage above 10 volts?

Yes

Repair the (K77) Transfer Case Position Sensor Input circuit for a short to voltage.
Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)

No
5
5.(K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT OPEN

Is the resistance greater than 5.0 ohms?

Yes

Repair the (K77) Transfer Case Position Sensor Input circuit for an open.
Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)

6.(Z940) GROUND CIRCUIT OPEN

Is the resistance above 5.0 ohms?

Yes

Replace AWD Control Module in accordance with Service Information.
Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)

7.INTERMITTENT TRANSFER CASE RANGE SELECT SWITCH PERFORMANCE

Were any problems found?

Yes