Transfer Case Verification Test

TRANSFER CASE VERIFICATION TEST

1. Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
2. Make sure that all accessories are turned off.
3. Make sure that the battery is fully charged.
4. With the scan tool, record and erase all DTC(s) from the Drive Train Control Module (DTCM) and the Cluster/CCN.
5. Test drive the vehicle. If equipped with a selector switch drive the vehicle in each Transfer Case range and verify proper operation in each range.
- To select or deselect 2WD, AWD or 4HI mode, vehicle speed must be below 88 Kmh (55 mph) with all wheels at vehicle speed.
- Shifts will not take place with a wheel speed difference of greater than 21 Kmh (13 mph) between the front and rear wheels.
- To select or deselect 4LO (if equipped), vehicle speed must be below 5 Kmh (3 mph) with the ignition on, engine not running and the transmission in neutral (automatic transmission) or the clutch pedal pressed (manual transmission).
- To select or deselect Transfer Case Neutral (if equipped), vehicle speed must be 0 Kmh (0 mph) with the ignition on, engine not running, the brake pedal applied, and the transmission in neutral (automatic transmission) or the clutch pedal pressed (manual transmission). Press the Neutral button (if equipped) on the Transfer Case Selector Switch until the Neutral Indicator is illuminated.
- WARNING: Apply the parking brake. The vehicle may roll with the Transfer Case in neutral.

- To verify that the Transfer Case is in Neutral, shift the automatic transmission into reverse and release the brake pedal for three seconds or shift the manual transmission into gear and slowly release the clutch pedal. There should be no vehicle movement if the Transfer Case is in Neutral.

6. With the scan tool, read DTCs in the Drive Train Control Module (DTCM) and in the Cluster Control Node (CCN).

Are any DTCs present in the DTCM or CCN?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection or Testing and Inspection.

No

- Test complete.