DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| C1401 | TRANSFER CASE RANGE SELECT SWITCH CIRCUIT LOW (CCN) |
| C1402 | TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH (CCN) |
| C1403 | TRANSFER CASE RANGE POSITION SENSOR PERFORMANCE (FCM) |
| C1404 | TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW (FCM) |
| C1405 | TRANSFER CASE RANGE POSITION SENSOR CIRCUIT HIGH (FCM) |
| C140B | TRANSFER CASE MOTOR CONTROL CIRCUIT LOW (FCM) |
| C140C | TRANSFER CASE MOTOR CONTROL CIRCUIT HIGH (FCM) |
| C140E | TRANSFER CASE MOTOR BLOCKED (FCM) |
| C230A | NEUTRAL INDICATOR CONTROL CIRCUIT LOW (CCN) |
| C230B | NEUTRAL INDICATOR CONTROL CIRCUIT HIGH (CCN) |
DIAGNOSTIC CODE INDEX
Scheme 116
Diagnostic Test
- 1) DTC IS ACTIVE Ignition on, engine not running. With the scan tool, read the FCM DTCs. Is the status Active for this DTC? Yes Go to 2) . No Go to 5) .
- 2) TRANSFER CASE INTERNAL CONDITION Turn the ignition off to the lock position. Inspect the Transfer Case in accordance with the Service Information to determine if there are any mechanical conditions that are preventing the Shift Motor from engaging the requested range. Are any mechanical conditions preventing the Shift Motor from engaging the requested range? Yes Repair or replace the Transfer Case in accordance with the Service Information. Perform «TRANSFER CASE VERIFICATION TEST - VER 1»(ref-285407-S03532512162008052100000) . No Go to 3) .
- 3) TRANSFER CASE MOTOR Turn the ignition off to the lock position. Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit. If any problems are found, repair as necessary and retest. If no other problems are found, replace the Transfer Case Motor in accordance with the Service Information. Ignition on, engine not running. Cycle the Transfer Case Selector Switch to each position several times during a test drive. With the scan tool, read the FCM DTCs. Is the DTC status Active? Yes Go to 4) . No Test complete. Perform «TRANSFER CASE VERIFICATION TEST - VER 1»(ref-285407-S03532512162008052100000) .
- 4) FRONT CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit. Were any problems found? Yes Repair as necessary. Perform «TRANSFER CASE VERIFICATION TEST - VER 1»(ref-285407-S03532512162008052100000) . No Replace the Front Control Module in accordance with the Service Information. Perform «TRANSFER CASE VERIFICATION TEST - VER 1»(ref-285407-S03532512162008052100000) .
- 5) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Were any problems found? Yes Repair as necessary. Perform «TRANSFER CASE VERIFICATION TEST - VER 1»(ref-285407-S03532512162008052100000) . No Test complete.
TRANSFER CASE VERIFICATION TEST - VER 1
Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
With the scan tool, select clear Stored DTCs.
Make sure that all accessories are turned off and that the battery is fully charged.
Test 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 and the transmission in neutral (auto trans) or the clutch pedal pressed (man trans).
- To select or deselect Transfer Case Neutral, vehicle speed must be 0 Kmh (0 mph) with the ignition ON, engine OFF, the brake pedal applied, and the transmission in neutral (auto trans) or the clutch pedal pressed (man trans). 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.
With the scan tool, read DTCs in the Front Control Module (FCM) and in the Instrument Cluster.
Are there any DTCs present in the Front Control Module (FCM) or in the Instrument Cluster?
Yes
- Return to the symptom list and perform the appropriate diagnostic test.
No
- Repair is complete.