1. Cycle the park brake switch.
2. Observe the park brake pump motor operation.

Does the park brake pump motor run?

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Go to Step 2

Go to Park Brake Pump Motor Does Not Run

Check the actuator movement during park brake pump motor operation.

Does the actuator extend normally?

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Go to Park Brake Pump Motor Does Not Run

Go to Step 3

1. Cycle the park brake switch.
2. Verify that the park brake pressure solenoid valve clicks.

Does the solenoid click?

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Go to Park Brake Pump Motor Does Not Run

Go to Step 4

1. Disconnect the park brake pressure solenoid valve connector.
2. Turn the ignition switch to the RUN position.
3. Connect a J 39200 DMM from CKT 1931 (YEL/BLK) to ground.
4. Measure the voltage.

Is the voltage more than the specified value?

>10.0 volts

Go to Step 5

Go to Step 8

Connect a J 39200 from CKT 150 (BLK) to ground.

Does the DMM indicate continuity?

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Go to Step 6

Go to Step 7

Replace the park brake pressure solenoid valve. Refer to Park Brake Solenoid Valve Replacement .

Is the repair complete?

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System OK

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Locate and repair the open in CKT 150 (BLK) between S107 and the park brake pressure solenoid valve.

Is the repair complete?

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System OK

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Locate and repair the open in CKT 1931 (YEL/BLK) between S385 and the park brake pressure solenoid valve.

Is the repair complete?

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System OK

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