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Selector Switch/Transfer Case-Mismatch

SELECTOR SWITCH/TRANSFER CASE-MISMATCH





For a complete wiring diagram refer to diagrams.
^ When Monitored:
With the ignition on and the engine running.
^ Set Condition:
When the 2WD/AWD position is selected, the Transfer Case Control Module performs a diagnostic routine to verify that the correct Transfer Case Selector Switch is in place.

Possible Causes

- INTERMITTENT SELECTOR SWITCH/TRANSFER CASE - MISMATCH
- CHARGING SYSTEM DTCS PRESENT
- VERIFY MODULE TYPE 233/2WD
- VERIFY MODULE TYPE 244/AWD
- VERIFY SELECTOR SWITCH 233/2WD
- VERIFY SELECTOR SWITCH 244/AWD
- (T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN
- (K977) MODE SELECT CIRCUIT OPEN
- TRANSFER CASE SELECTOR SWITCH 233/2WD
- TRANSFER CASE SELECTOR SWITCH 244/AWD
- TRANSFER CASE CONTROL MODULE

1. CHARGING SYSTEM DTCS PRESENT With the DRBIII read Engine DTCs.

Are there any Charging System related DTCs present?
Yes >>Refer to the symptom list and perform the appropriate diagnostic procedure(s) as necessary.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test
No >>Go To 2

2. SELECTOR SWITCH/TRANSFER CASE-MISMATCH DTC PRESENT
With the DRBIII read Transfer Case DTCs. Record all DTC information.

NOTE: If there are any other Transfer Case Control Module DTCs present, perform the applicable diagnostic procedures before continuing with this test.

With the DRBIII erase Transfer Case DTCs.
Start the engine and cycle the Transfer Case Selector Switch through all positions.
With the DRBIII read Transfer Case DTCs.

Does the DRBIII display SELECTOR SWITCH/TRANSFER CASE-MISMATCH?
Yes >>Go To 3
No >>Go To 13

3. VERIFY TRANSFER CASE TYPE
Identify the Transfer Case type using the Transfer Case Identification Tag.
Select the Transfer Case type as indicated by the Identification Tag:
233/2WD Go To 4
244/AWD Go To 7

4. VERIFY MODULE TYPE 233/2WD
Identify the Transfer Case type using the DRBIII
Compare the Transfer Case type as identified by both the Identification Tag and the DRBIII

Do both identify the Transfer Case as 233/2WD?
Yes >>Go To 5
No >>Reprogram the Transfer Case Control Module as type 233/2WD in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

5. VERIFY SELECTOR SWITCH TYPE 233/2WD
Visually identify the Transfer Case Selector Switch type.

Does the Selector Switch display 2WD/4HI/4LO?
Yes >>Go To 6
No >>Replace the Transfer Case Selector Switch type 233/2WD in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

6. TRANSFER CASE SELECTOR SWITCH 233/2WD
Turn the ignition off to the lock position.
Disconnect the Transfer Case Selector Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between the (K977) Mode Select circuit and the (T322) 5 Volt Selector Switch Supply circuit in the Transfer Case Selector Switch.

Is the resistance between 5200 and 5950 ohms?
Yes >>Go To 10
No >>Replace the 233/2WD Transfer Case Selector Switch in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

7. VERIFY MODULE TYPE 244/AWD
Identify the Transfer Case type using the DRBIII
Compare the Transfer Case type as identified by both the Identification Tag and the DRBIII

Do both identify the Transfer Case as 244/AWD?
Yes >>Go To 8
No >>Reprogram the Transfer Case Control Module as type 244/AWD in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

8. VERIFY SELECTOR SWITCH TYPE 244/AWD
Visually identify the Transfer Case Selector Switch type.

Does the Selector Switch display AWD/4HI/4LO?
Yes >>Go To 9
No >>Replace the Transfer Case Selector Switch type 244/AWD in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

9. TRANSFER CASE SELECTOR SWITCH 244/AWD
Turn the ignition off to the lock position.
Disconnect the Transfer Case Selector Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between the (K977) Mode Select circuit and the (T322) 5 Volt Selector Switch Supply circuit in the Transfer Case Selector Switch.

Is the resistance between 3050 and 3600 ohms?
Yes >>Go To 10
No >>Replace the 244/AWD Transfer Case Selector Switch in accordance with the Service Information.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

10. (T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN





Turn the ignition off to the lock position.
Disconnect the Transfer Case Control Module C2 harness connector.

NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running.

Measure the resistance of the (T322) 5 Volt Selector Switch Supply circuit from the Transfer Case Selector Switch harness connector to the Transfer Case Control Module C2 harness connector.

Is the resistance below 5.0 ohms?
Yes >>Go To 11
No >>Repair the (T322) 5 Volt Selector Switch Supply circuit for an open circuit or high resistance.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

11. (K977) MODE SELECT CIRCUIT OPEN





Disconnect the Transfer Case Control Module C1 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the (K977) Mode Select circuit from the Transfer Case Selector Switch harness connector to the Transfer Case Control Module C1 harness connector.

Is the resistance below 5.0 ohms?
Yes >>Go To 12
No >>Repair the (K977) Mode Select circuit for an open circuit or high resistance.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

12. TRANSFER CASE CONTROL MODULE
Using the wiring diagram as a guide, inspect the wiring and connectors relative to this DTC. Inspect all power and ground circuits. Repair as necessary.
If there are no Charging System related DTCs or other possible causes remaining, view repair.

Repair
Replace the Transfer Case Control Module.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test

13. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
Using the DRBIII monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?
Yes >>Repair as necessary.
Perform TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test
No >>Test Complete.
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