Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Vacuum Diagrams: Introduction
This article contains underhood schematics of vacuum hose routing. Use these vacuum diagrams during the visual inspection performed in the appropriate BASIC DIAGNOSTIC PROCEDURES article. This will assist in identifying improperly routed vacuum hoses, which may cause driveability and/or computer-indicated malfunctions. To properly identify calibration code, catch code must be identified. The catch code is the 4 alpha/numeric characters located in parenthesis at the end of the calibration code. Example; 9-EQA-BBD 9 (BAX3). The BAX3 is the catch code. The catch code tag is attached to the powertrain control module connector. See POWERTRAIN CONTROL MODULE LOCATIONΒ table. On some models, the catch code tag may also be located on the "A" pillar or inner fender.
| Model | Location | |
|---|---|---|
| Econoline & Excursion | Left Rear Of Engine Compartment, Near Master Cylinder | |
| Expedition, Explorer, Mountaineer, Navigator & Ranger | Right Rear Of Engine Compartment, Mounted On Cowl | |
| Pickup | ||
| F150 | Behind Right Kick Panel, Through Bulkhead | |
| F250/F350 Super Duty | Left Rear Of Engine Compartment, Near Master Cylinder | |
| Villager | Behind Glove Box | |
| Windstar | Right Rear Of Engine Compartment, Mounted On Cowl | |
| Application/Calibration No. | See | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Econoline | ||||||||||||
| 4.2L | Fig 1 | |||||||||||
| 4.6L | Fig 2 | |||||||||||
| 5.4L | (1) | |||||||||||
| 6.8L | ||||||||||||
| 0-E41-8H0-B10 (HNS6) | (2) | |||||||||||
| 0-E41-8H0-B12 (HNS6), 0-E41-8R0-B06 (MLD2) & 9-DTA-BGD (CHK4) | Fig 3 | |||||||||||
| 0-E41-8Q0-B10 (TVF3) | Fig 4 | |||||||||||
| 0-418-Q0B-06 (TVF | (3) | |||||||||||
| 0-E41-8R0-B10 (MLD3) & 0-E41-8R0-B11 (MLD4) | Fig 5 | |||||||||||
| 0-E41-8N0-506 (MXK2), 0-E41-8N0-510 (MXK3), 0-E41-8P0-A6 (CIS2) & 0-E41-8P0-A10 (CIS3) | Fig 6 | |||||||||||
| Excursion | ||||||||||||
| 5.4L | (1) | |||||||||||
| 6.8L | ||||||||||||
| 0-L11-8D0-B06 (MXH2) | Fig 2 | |||||||||||
| 0-L11-8N0-A06 (FXU2) | Fig 7 | |||||||||||
| Expedition | ||||||||||||
| 4.6L | Fig 2 | |||||||||||
| 5.4L | Fig 8 | |||||||||||
| Explorer & Mountaineer | ||||||||||||
| 4.0L | ||||||||||||
| OHV (4) | Fig 9 | |||||||||||
| SOHC | ||||||||||||
| 9-NEA-ABB (JNJ1) | Fig 10 | |||||||||||
| 9-NEA-BAH (CDE4) & 0-U31-A40-505 (LXD1) | Fig 11 | |||||||||||
| 5.0L | Fig 12 | |||||||||||
| Navigator | Fig 8 | |||||||||||
| Pickup | ||||||||||||
| F150 | ||||||||||||
| 4.2L | Fig 13 | |||||||||||
| 4.6L | ||||||||||||
| Except 0-F51-6EO-B10 (RQD3) | Fig 14 | |||||||||||
| 0-F51-6EO-B10 (RQD3) | Fig 2 | |||||||||||
| 5.4L | ||||||||||||
| 0-F51-4DO-B06 (CPE2), 0-F51-4DO-B10 (DPE3), 0-F51-4DO-B11 (CPE4), 0-F51-4MO-B06 (NCG2), 0-F51-4MO-B10 (NCG3) & 0-F51-4MO-B11 (NCG4) | Fig 8 | |||||||||||
| 0-F52-2B0-A06 (UUV2), 0-F52-2E0-A06 (FRR2), 0-F52-2F0-A06 (KWV2), 0-F52-2G0-B07 (SKB3) & 0-F52-2H0-B07 (EGJ3) | Fig 13 | |||||||||||
| F250/F350 Super Duty | ||||||||||||
| 5.4L | ||||||||||||
| 0-F51-4DO-B11 (CPE4), 0-F72-8A0-B06 (ZLG2), 0-F72-8A0-B10 (ZLG3), 0-F71-4D0-B06 (FVR2) & 0-F71-4D0-B10 (FVR3) | Fig 8 | |||||||||||
| 7-28V-0A0-6 (DRC2), 0-F71-4N0-A10 (CPY3), 0-F71-4N0-A11 (CPY4), 0-F72-8V0-A10 (DRC3) & 0-F72-8V0-A11 (DRC4) | Fig 15 | |||||||||||
| 6.8L | ||||||||||||
| 0-F71-8C0-B06 (WKR2), 0-F71-8C0-B10 (WKR3), 0-F71-FC0-B11 (FID4) & 0-F71-8C0-B11 (WKR4) | Fig 8 | |||||||||||
| 0-F71-8P0-A06 (FDA2), 0-F71-7P0-A10 (KND3), 0-F71-8P0-A11 (FDA4) & 0-F71-7P0-A11 (KND4) | Fig 15 | |||||||||||
| 0-F71-7P0-A06 (KNDE), 0-F71-8R0-B06 (QED2), 0-F71-7R0-B06 (QUM2), 0-F71-8R0-B10 (QDE3) & 0-E71-7R0-B10 (QUM3) | Fig 5 | |||||||||||
| Ranger | ||||||||||||
| 2.5L | Fig 16 | |||||||||||
| 3.0L | Fig 17 | |||||||||||
| 4.0L | Fig 18 | |||||||||||
| Villager | Fig 19 | |||||||||||
| Windstar | ||||||||||||
| 3.0L | Fig 20 | |||||||||||
| 3.8L | Fig 21 | |||||||||||
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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