Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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This step determines if the transfer case shift control module has electronic control of the switch indicator lamps.
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This step provides a ground to the indicator lamp circuits in order to eliminate the transfer case shift control module.
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This step checks for B+ in the indicator lamp circuits.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Transfer Case Diagnostic System Check performed? | -- | Go to Step 2 | |
Do the switch indicator lamps turn On? | -- | Go to Step 7 | Go to Step 3 | |
3 |
Do each of the switch indicator lamp states change from OFF to ON as Indicator Lamps are commanded ON? | -- | Go to Step 7 | Go to Step 4 |
Do each of the lamps illuminate when its circuit is grounded? | -- | Go to Step 7 | Go to Step 5 | |
Connect a J 39200 Digital Multimeter DMM between the suspect circuit and ground in order to measure voltage. Is the voltage within the specified value? | 9-14 V | Go to Step 8 | Go to Step 6 | |
6 | Inspect the suspect circuit(s) for open. Refer to Wiring Repairs in Wiring Systems. Were the suspected circuit(s) open? | -- | Go to Step 9 | Go to Step 8 |
7 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Is the action complete? | -- | Go to Step 10 | -- |
8 | Replace the range/mode switch. Refer to Transfer Case Shift Control Switch Replacement . Is the action complete? | -- | Go to Step 10 | -- |
9 | Repair an open in the suspect circuit(s). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 10 | -- |
10 |
Have all the ATC components been reconnected and properly mounted? | -- | Go to Step 11 | -- |
11 | Clear all ATC DTCs. Have all the ATC DTCs been cleared? | -- | -- |
