Step | Action | Yes | No |
|---|---|---|---|
DEFINITION: 4WD always engaged, all other engine and transmission functions are normal. | |||
1 | Did you review the transfer case operation and perform the necessary inspections? | Go to Step 2 | Go to Transfer Case Diagnostic System Check |
2 |
Does the 4WD system disengage? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Is the 4WD indicator illuminated? | Go to Step 4 | Go to Step 7 |
4 | Test the four wheel drive switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
5 | With the transfer case in 2WD, test the four wheel drive switch for continuity. Refer to Testing for Continuity in Wiring Systems. Is continuity present? | Go to Step 6 | Go to Step 7 |
6 | Replace the four wheel drive switch. Refer to Selector Switch Replacement . Did you complete the replacement? | Go to Step 9 | -- |
7 | Test the axle actuator control circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
8 | Replace the front drive axle actuator pump. Refer to Electric Motor Actuator Replacement in front axle. Did you complete the replacement? | Go to Step 9 | Go to Step 9 |
9 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
