Description

DAF CF65, CF75, CF85, XF105, F735 2007 Technical Manual – ECAS-4 System and Component Information

You’ve got a DAF truck with air suspension acting up – maybe a CF65 that won’t lift the rear, or an XF105 that drops overnight. Without the factory ECAS-4 documentation, you’re guessing which valve is stuck or which sensor is lying. Guessing on air suspension costs you billable hours and can leave a truck dead on the shoulder. This 104-page DAF CF65, CF75, CF85, XF105, F735 2007 Technical Manual is the original DAF publication – not a copy, not a reprint from a third party. It’s the same binder the dealer techs had in 2007.

ECAS-4 Power Supply and Earth Circuits – The First Thing to Check

Section 1.1 covers the power supply and earth of the ECAS-4 electronic unit (D992). I’ve seen more than one tech replace an ECAS valve only to find a corroded ground pin. The manual gives you the exact pin-out for the ECU, including CAN connection data (section 1.2). You get the factory wire colors and connector views – no aftermarket redraw that misses a splice. Page 1 of the manual shows the system overview. Having the correct power and ground paths means you don’t chase ghosts.

Valve Specifications: Front Axle (B166) and Driven Axles (B238, B250)

Three separate valve sections in this manual – front axle supply valve B166, driven axle supply valves FT (B238) and FA (B250). Each one lists the coil resistance, operating voltage, and the air port functions. If you swap a valve without checking the coil resistance against the spec, you risk a solenoid that draws too much current and blows the ECU driver. The manual also covers the ECAS lift/lower axle valve (B254). For those, you need the exact pin identification. I keep this manual open when I’m testing with a multimeter so I don’t mis-pin a connector.

Height and Pressure Sensors: F612, F613, F614, F735, F736, F615

Sensors are where most ECAS complaints live. Sections 1.7 through 1.9 detail the height sensors (F612, F613, F614) and the pressure sensors (F735, F736, F615). Each sensor has a test procedure – output voltage versus arm position for height sensors, and pressure-to-voltage curves for the pressure sensors. The manual gives you the expected values so you can decide if a sensor is bad or if the wiring is the problem. Without these specs, you’re swapping parts. That’s expensive. I’ve used the pressure sensor data on a CF75 that wouldn’t maintain ride height – turned out to be a F735 sensor drifting, not a valve leak.

ECAS Remote Control and Driving Level Switches (D529, C740–C895)

Sections 1.10 through 1.15 cover the remote control (D529) and all the switches: normal driving level (C740), second driving level (C899), lift/lower axle (C741), traction control (C742), and increased manoeuvring level (C895). Each switch has a wiring diagram and a continuity table. For example, the remote control D529 uses a specific CAN message pattern – the manual shows you the signal timing. If the remote won’t raise the truck, you can check the switch contacts and the CAN bus without guessing. I’ve had calls from other shops that spent a day changing a D529 box when the problem was a broken wire in the switch harness.

Source Authenticity: Why This OEM Manual Beats Aftermarket

This is a 2007 DAF Trucks N.V. publication, copyrighted with the statement that no part may be reproduced without written consent. It’s the real deal – the same PDF that DAF issued to their network. Aftermarket manuals often omit the ECAS-4 specific CAN communication data or the pressure sensor calibration tables. I’ve seen a generic manual list a generic torque value for a valve mounting bolt that would strip a DAF casting. This manual doesn’t have that problem because it came from the factory. You get the original page numbering and the DAF part numbers for every component. If you’re working on a CF65 or XF105, you need factory data.

Who Needs This Manual and How to Use It

If you own a DAF CF65, CF75, CF85, XF105, or F735 with the ECAS-4 system, this manual is for you. It’s also for fleet mechanics who see these trucks regularly and need to narrow down a suspension issue fast. A real‑world scenario: an XF105 shows ‘ECAS fault’ on the dash, and the rear drops after parking. With this manual, you can isolate the supply valve B238 from the height sensor F614 by following the diagnostic steps. You don’t need a dealer scan tool – the manual gives you voltage checks at the ECU pins. Pair it with the DAF XF105 Electrical system Wiring Diagram for the full vehicle electrical picture. For older trucks, the DAF CF65/75/85 2003 Electrical Technical Manual covers the earlier ECAS versions, and the DAF CF65 CF75 CF85 2005 Technical Manual fills in gaps for mid‑year changes. If you need a refresher on how a Manual Transmission works, that’s a different topic, but for the ECAS air system, stick with this factory manual.

Frequently Asked Questions

Does this manual include wiring diagrams for the entire truck?

No. It focuses on the ECAS-4 system – ECUs, valves, sensors, and switches. Full chassis wiring is in the separate electrical wiring diagram manual.

Can I use this manual for a CF65 built in 2005?

The manual covers CF65 IV, CF75 IV, CF85 IV, and XF105 models as of 2007. For a 2005 CF65 (likely pre‑IV), the ECAS version may differ. Check the vehicle VIN and compare the ECU part number. The height sensor data should be similar, but the valve pin‑outs might be different. I’d cross‑reference with the earlier manuals.

Are torque values listed for the valve and sensor mounting bolts?

This technical manual does not include torque specs. It is a system and component information document – it tells you what each part does, how it connects, and how to test it. For assembly torque, you need the separate DAF workshop manual.

How is this different from a generic ECAS troubleshooting guide?

Generic guides give you one‑size‑fits‑all advice. This manual is DAF‑specific: it lists the exact DAF part numbers (B166, D992, etc.), the factory CAN message IDs, and the DAF‑only pressure sensor calibration curves. That level of detail prevents misdiagnosis. I’ve seen generic guides tell a tech to check voltage at a pin that doesn’t exist on the DAF ECU.

You need the right documentation to keep a DAF on the road. Whether you’re a DIY owner working on a CF65 or a shop foreman with a fleet of XF105s, this 104-page factory manual gives you the ECAS-4 data that DAF designed the system with. Stop wasting time on aftermarket approximations. Access the Factory Manual and get the real specs.

• Related: DAF XF105 Electrical system Wiring Diagram
• Related: DAF CF65/75/85 2003 Electrical Technical Manual
• Related: DAF CF65 CF75 CF85 2005 Technical Manual
• External: Manual Transmission
• External: Manual Transmission