Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the transfer case Diagnostic System Check? | -- | Go to Diagnostic System Check | |
2 | Verify the fault is present. Does the system operate normally? | -- | ||
3 | Does the front axle engage when the four wheel drive (4WD) control lever is in the 4WD position? | -- | ||
4 | Using the scan tool, under special test in instrument cluster, activate the 4WD indicator lamp to ON. Does the lamp come on? | -- | ||
5 |
Does the scan tool show switch status yes? | -- | ||
6 |
Does the test lamp illuminate? | -- | ||
7 |
Does the test lamp illuminate? | -- | ||
8 |
Does the test lamp illuminate? | -- | ||
9 | Repair short to ground in the 4WD front wheel lock telltale feed circuit . Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
10 | Repair open in the 4WD front wheel lock telltale feed circuit between the switch and the PCM/VCM. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
11 | Replace the front axle actuator/switch. Refer to Electric Motor Actuator Replacement in Front Drive Axle. Did you complete the replacement? | -- | -- | |
12 | Replace the VCM/PCM. Refer to VCM Replacement/Programming for 4.3L or Powertrain Control Module Replacement for all other engines Did you complete the replacement? | -- | -- | |
13 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK |
