Did you perform the HVAC Air Delivery System check?

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Go to Step 2

Go to HVAC Air Delivery System Check

1. Disconnect the P/B Booster Vacuum Switch.
2. Connect a fused jumper between cavity A and B.

Does the P/B Booster Vacuum Pump operate?

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Go to Step 3

Go to Step 4

1. Inspect the P/B Booster Vacuum Canister for a restriction that would maintain vacuum within the canister.
2. If the canister is OK, replace the P/B Booster Vacuum Switch.

Did you complete the repair?

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Go to Step 13

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Check CKT 50 (BLK) wire for continuity to ground.

Does CKT 50 (BLK) wire have continuity to ground?

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Go to Step 6

Go to Step 5

Locate and repair open CKT 50 (BLK) wire.

Did you complete the repair?

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Go to Step 13

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Inspect ENG-1 fuse for open.

Is ENG-1 fuse open?

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Go to Step 7

Go to Step 8

1. Locate and repair short to ground in CKT 239 (PNK) wire.
2. If the wire is OK, replace the P/B Booster Vacuum Pump.

Did you complete the repair?

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Go to Step 13

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1. Disconnect the P/B Booster Vacuum Pump.
2. Turn ignition ON.
3. Check CKT 239 (PNK) wire for voltage.

Is voltage present?

Battery voltage

Go to Step 10

Go to Step 9

Locate and repair open in CKT 239 (PNK) wire.

Did you complete the repair?

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Go to Step 13

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Check CKT 950 (BLK) wire for continuity.

Does CKT 950 (BLK) wire have continuity?

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Go to Step 11

Go to Step 12

Replace P/B Booster Vacuum Pump.

Did you complete the repair?

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Go to Step 13

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Locate and repair open in CKT 950 (BLK) wire.

Did you complete the repair?

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Go to Step 13

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Reconnect all disconnected components.

Is the action complete?

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Go to HVAC Air Delivery System Check