T-CASE SWITCH HIGH (BCM)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The Body Control Module (BCM) will set this DTC if voltage goes above 4.8 volts for more than 5 seconds on the (K77) Transfer Case Position Sensor Input circuit.
| Possible Causes |
| (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO VOLTAGE |
| (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT OPEN |
| (K300) SENSOR GROUND CIRCUIT OPEN |
| TRANSFER CASE POSITION SENSOR |
| BCM |
Diagnostic Test
1.CHECK THE TRANSFER CASE POSITION SENSOR INPUT VOLTAGEIs the voltage above 4.5 volts?
Yes
- Go To 2
No
- Go To 7
2.CHECK THE (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT VOLTAGE
Is the voltage above 5.2 volts?
Yes
- Go To 3
No
- Go To 4
3.CHECK THE (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE
Is the voltage above 0.2 volts?
Yes
- Repair the (K77) Transfer Case Position Sensor Input circuit for a short to voltage.
No
- Replace and program the BCM in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
4.CHECK THE (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT & THE (K300) SENSOR GROUND CIRCUIT FUNCTION
Is the voltage below 1.0 volt?
Yes
- Replace the Transfer Case Position Sensor in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 5
5.CHECK THE (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT FOR AN OPEN
Is the resistance below 5.0 ohms?
Yes
- Go To 6
No
- Repair the (K77) Transfer Case Position Sensor Input circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
6.CHECK THE (K300) SENSOR GROUND CIRCUIT FOR AN OPEN
Is the resistance below 5.0 ohms?
Yes
- Replace and program the BCM in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Repair the (K300) Sensor Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
7.TEST FOR INTERMITTENT CONDITION
NOTE: The condition that set this DTC is not present at this time. The following may help in identifying the cause of the intermittent condition.
Were any problems found?
Yes
- Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Test Complete.