Was the Transfer Case Diagnostic System Check performed?

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Go to Step 2

Go to Transfer Case Diagnostic System Check

1. Turn the ignition ON, engine ON.
2. Connect a Scan Tool in order to monitor the Front Axle Switch status.
3. Use the Scan Tool to engage the front axle.

Does the Front Axle Switch status change from UNLOCKED to LOCKED?

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Go to Step 11

Go to Step 3

3

Drive the vehicle in four wheel drive mode in order to determine if torque is being applied to the front wheels (the vehicle will display crow-hop or jerking during tight turns).

Is torque being applied to the front wheels?

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Go to Step 8

Go to Step 4

While the engine is running, inspect the front drive axle clutch solenoid for proper vacuum supply.

Is there proper vacuum supplied to the front drive axle clutch solenoid?

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Go to Step 5

Go to Step 12

5

1. Turn the ignition ON, engine OFF.
2. Disconnect the connector at the front drive axle clutch solenoid.
3. Connect a J 39200 Digital Multimeter DMM between the front drive axle clutch solenoid harness connector terminal A and ground.

Is the voltage within the specified values?

B+

Go to Step 6

Go to Step 15

6

1. Connect a J 39200 DMM between the front drive axle clutch solenoid harness connector terminal B and ground.
2. Use a Scan Tool in order to lock the front axle while monitoring the resistance value on the DMM.

Is the resistance reading within the specified values?

0-2 ohms

Go to Step 13

Go to Step 7

7

1. Disconnect connector C1 at the transfer case shift control module.
2. Connect a J 39200 DMM between the transfer case shift control module connector C1 terminal F4 and the front drive axle clutch solenoid harness connector terminal B.

Is the resistance reading within the specified values?

0-2 ohms

Go to Step 11

Go to Step 16

8

1. Turn the ignition ON, engine OFF.
2. Disconnect the connector at the front axle switch.
3. Use a fused jumper across terminals A and B at the front axle switch harness connector.
4. Observe the state of the front axle switch with the Scan Tool .

Does the scan tool display for the front axle switch position change from UNLOCKED to LOCKED?

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Go to Step 14

Go to Step 9

1. Turn the ignition ON, engine OFF.
2. Connect a J 39200 DMM between the front axle switch connector terminal A and ground.

Is the voltage within the specified values?

B+

Go to Step 10

Go to Step 15

10

1. Disconnect connector C1 at the transfer case shift control module.
2. Connect a J 39200 DMM between the transfer case shift control module harness connector C1 terminal E14 and the front axle switch harness connector terminal B.

Is the resistance reading within the specified values?

0-2 ohms

Go to Step 11

Go to Step 17

Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .

Is the repair complete?

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Go to Step 18

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Repair vacuum leak between the engine and the front drive axle clutch solenoid.

Is the repair complete?

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Go to Step 18

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Replace the front drive axle clutch solenoid. Refer to Vacuum Actuator Replacement in Driveline and Axle.

Is the action complete?

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Go to Step 18

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Replace the front axle switch.

Is the action complete?

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Go to Step 18

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Repair open in CKT 241. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 18

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Repair open in CKT 1570. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 18

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Repair open in CKT 1695. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 18

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1. Ensure that the ignition is OFF.
2. Properly mount and reconnect all previously disconnected ATC components.

Have all the ATC components been reconnected and properly mounted?

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Go to Step 19

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Clear all the ATC DTCs.

Have all the ATC DTCs been cleared?

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Go to Transfer Case Diagnostic System Check

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