An aftermarket distributor looking up “Scania 1934981″ or “Volvo 3099148″ on a 24V ABS solenoid valve is usually not looking for a part number — they are looking for a yes-or-no answer on whether the unit fits the truck on the lift. This article walks through what those two OEM numbers actually represent on our Scania solenoid valve line, how the electrical and mechanical specifications compare, where the two references cross over, and where they do not.

What a 24V ABS Solenoid Valve Actually Does in a Heavy-Duty Truck

Our engineering team treats a 24V ABS solenoid valve as the actuator that converts the ABS or EBS electronic control unit’s command into a hydraulic pressure change at the wheel brake. The valve is normally closed; when the ECU detects wheel slip, it pulses the solenoid open to dump or modulate pressure, and the brake responds through the modulator block the valve is bolted to. The 24V rating is the truck’s nominal system voltage — a heavy-truck electrical system runs at 24V nominal, dropping to roughly 21V under load and rising to 28V during charging.

The valve’s job is small in mechanical terms but large in safety terms. A valve that sticks closed disables ABS on the corner it serves; a valve that sticks open can cause a wheel lock under braking. Our quality team tests every production lot against the holding-pressure and response-time thresholds published by the truck OEM and by the ABS system standards the OEM designs to. The aftermarket distributor who orders a 1934981 or a 3099148 from us is buying the same build quality the truck line shipped with — same pressure envelope, same response profile, same electrical resilience — but matched to the connector and calibration of the OEM number on the box.

Our engineering team treats the ABS solenoid as a sub-assembly inside the larger modulator block, not a standalone service part. The valve seats into a machined bore in the modulator; the coil winding terminates at a connector that is part of the modulator’s harness loom; the calibration map is set by the ECU’s learned-current handshake, which is set by the valve’s coil resistance and the ECU’s expectation of where that resistance will land. A substitute valve that lands outside the ECU’s expectation triggers a soft fault; the dashboard ABS light comes on; the truck fails inspection at the next commercial-vehicle test. Our distributors see this failure mode every quarter from at least one customer who tried the bench-test-only cross-fit; our documentation team tracks the field returns against the lot number so we can close the loop with the production cell on the calibration profile.

The aftermarket distribution model makes the connector and calibration pair especially important. The OE supplier ships a single valve per truck platform and the harness is built into the chassis loom. The aftermarket distributor ships hundreds of valves per year, mixed across multiple platforms, and the customer pulling the part off the shelf does not know whether the truck on the lift is a Scania R450 or a Volvo FH13 until the harness connector is in their hand. Our documentation team prints the OEM number, the connector variant, and the calibration profile on the box label and on the per-unit record so the distributor’s parts counter can match the right valve to the right truck without opening the packaging.

Scania 1934981: Electrical, Mechanical, and Connector Spec

Scania 1934981 is the OEM reference for a 24V ABS solenoid valve used on Scania truck and bus platforms, typically the R-series, P-series, and the older 4-series cabs that still roll through European fleets. Our production line ships against 1934981 with the following envelope:

• Coil voltage: 24V DC nominal, 18-32V operating range.
• Coil resistance: typically 7.5-9.5 Ω at 20 °C (the exact figure varies by lot; our documentation team records the measured value on the per-unit record).
• Pressure rating: up to 13 bar working pressure at the modulator port.
• Operating temperature: -40 °C to +85 °C ambient at the modulator block.
• Connector geometry: 2-pin sealed connector, Scania-standard pinout (not DIN 72585; Scania uses its own bayonet variant).
• Calibration map: matched to Scania’s ABS/EBS ECU handshake, including the holding-current profile the ECU uses to reduce power dissipation after the initial pull-in.

The Scania connector is the first place an aftermarket distributor gets tripped up. It looks similar to a DIN 72585 bayonet but the keyway orientation differs, and the seal carrier is dimensioned for the Scania harness family rather than the European DIN standard. Scania’s parts documentation treats the connector geometry as part of the part number; substituting a DIN 72585 valve into a Scania harness either fails to seat or, worse, seats but loses the IP6K7 seal at the connector interface and pulls water into the modulator block over time.

The second trip point is calibration. Scania’s ABS ECU does a learned-current handshake on power-up; if the holding-current profile of the substitute valve drifts outside the ECU’s window, the ECU flags a soft fault and the dashboard ABS light stays on. Our quality team tests the holding-current profile against the Scania ECU reference window before each production batch ships, so a 1934981-equivalent from us passes the same handshake as the original-equipment part.

The third trip point is the mechanical seat. Scania’s modulator blocks have a machined bore with a specific chamfer and O-ring gland dimension; our 1934981-equivalent is built to that bore geometry so the valve seats without re-machining. Our quality team measures each lot against a Scania modulator reference fixture on the production line; the seat depth, the O-ring compression, and the axial play all have to land inside the published tolerance band. A valve that seats too deep will bind inside the bore; a valve that seats too shallow will not seal the O-ring. Either failure mode shows up at the truck’s first commercial-vehicle test, not on the bench.

Volvo 3099148: Electrical, Mechanical, and Connector Spec

Volvo 3099148 is the OEM reference for a 24V ABS solenoid valve used on Volvo FH, FM, and FL truck platforms, and on the B-series bus chassis that share the Volvo EBS architecture. Our production line ships against 3099148 with a parallel envelope and a few specific divergences:

• Coil voltage: 24V DC nominal, 18-32V operating range (same envelope as Scania).
• Coil resistance: 7.0-9.0 Ω at 20 °C (a tighter band than the Scania reference, because the Volvo ECU’s current window is narrower).
• Pressure rating: up to 13 bar working pressure.
• Operating temperature: -40 °C to +85 °C ambient.
• Connector geometry: 2-pin sealed connector, Volvo-standard pinout (closer to DIN 72585 than Scania’s, but with a different seal carrier).
• Calibration map: matched to Volvo’s EBS ECU handshake, including the proprietary pull-in pulse profile Volvo uses to reduce coil inrush current.

Volvo’s parts documentation treats the connector geometry and the calibration map as inseparable from the OEM number. The connector is the visual cue — a Volvo connector is close enough to a DIN 72585 that a Scania-trained technician may try it — but the seal carrier and the locking collar are dimensioned for the Volvo harness family. A DIN 72585 valve in a Volvo harness seats but does not lock correctly, and the harness can pull out under vibration before the modulator reaches operating pressure.

The calibration map is the second discriminator. Volvo’s EBS ECU uses a proprietary pull-in pulse profile — a brief high-current pulse followed by a lower holding current — that reduces coil inrush and the resulting voltage dip on the truck’s 24V bus. Our quality team tests each production lot against the Volvo ECU reference, and our documentation team logs the measured pull-in and holding currents on the per-unit record so the Volvo-trained technician can audit the calibration before installation.

The mechanical seat on the Volvo side carries the same story as the Scania side, with the bore dimension shifted to Volvo’s modulator block geometry. Our 3099148-equivalent is built to the Volvo reference fixture, with the seat depth and the O-ring compression measured against a Volvo modulator at the production line. The bore tolerance is tight — within a few hundredths of a millimetre — because Volvo’s modulator block has a shorter land than the Scania equivalent and the O-ring gland has to seal on a smaller surface. Our quality team’s lot acceptance is against the Volvo fixture, not against a generic ABS valve reference, which is what separates the OE-equivalent shipment from a generic aftermarket valve.

Side-by-Side Comparison: Where the Two References Agree and Diverge

The five rows that agree — voltage, voltage range, pressure, temperature, and basic coil-resistance overlap — explain why the two references are sometimes mistaken for interchangeable. The four rows that diverge — connector geometry, seal carrier, calibration map, chassis fitment — explain why a direct swap fails in the field. Our engineering team treats the divergence rows as the load-bearing specification; a distributor who specs on the agreement rows alone is buying a part that fits the bench test and fails the truck test.

For the distributor reading the table at the parts counter, the practical heuristic is this: if the box label lists a Scania OEM number, the valve inside is calibrated for a Scania ECU; if the box label lists a Volvo OEM number, the valve inside is calibrated for a Volvo ECU. The connector geometry, the seal carrier, and the calibration profile are matched to the OEM number, not to a generic ABS valve reference. Our documentation team prints the OEM number, the chassis fitment list, and the calibration profile on the box label so the distributor’s parts counter can match the right valve to the right truck without opening the packaging.

Cross-Fit Scenarios: When a Harness Adapter Is the Right Answer

There are three real cross-fit scenarios our team encounters from aftermarket distributors, and each one has a different right answer.

Scenario 1 — Volvo truck, Scania harness on hand. The distributor has a 1934981 in stock and a Volvo FH on the lift. The right answer is a Scania-to-Volvo harness adapter with a calibrated resistor to bridge the coil-resistance gap, plus a Volvo ECU re-flash or to a learned-current reset. Our team stocks the harness adapter for this case; the resistor and the ECU reset are dealer-side operations.

Scenario 2 — Scania truck, Volvo harness on hand. The reverse. Same logic, reverse adapter. The connector keyway is the discriminator, not the voltage envelope.

Scenario 3 — Mixed fleet, single valve SKU. The distributor wants one valve SKU that can be programmed or adapted at the bench to serve both Scania and Volvo trucks. The right answer is a programmable solenoid with field-selectable calibration; we ship a programmable variant against both 1934981 and 3099148 with the calibration loaded at the bench per the distributor’s fleet mix. The programmable valve costs more than the fixed-calibration valve and pays for itself only at fleet scales where the inventory carrying cost of two SKUs exceeds the per-unit price premium.

What Shaoxing Fangjie Ships Against Each Reference

Shaoxing Fangjie Auto Accessory Co., Ltd. produces the 24V ABS solenoid valve family on its solenoid valve production line in Shaoxing, with the Scania 1934981-equivalent and the Volvo 3099148-equivalent as catalogue SKUs in the aftermarket distribution line. Our quality team runs each production lot through a 100% bench test that captures the coil resistance, the holding-current profile, the response time at the rated pressure, and the connector-seat verification. The per-unit record carries the measured values; the distributor can pull the data into their incoming-inspection system through the documentation package that ships with each order.

The production equipment behind the line includes the CNC machining centres and the assembly benches described on the company’s profile page; the solenoid valve production cell runs alongside the brake caliper, slack adjuster, and brake chamber cells that share the same Fuquanshan Industrial Park facility. Our foreign trade team handles the export documentation for distributors in Europe, Southeast Asia, and the Middle East, and the per-shipment record includes the calibration profile, the connector variant, and the lot number so the distributor’s incoming-inspection team can match it against the OEM number on the truck’s parts list.

Our quality team’s 100% bench test is the single most important step in the production flow. Each valve is cycled at the rated pressure, the coil resistance is measured at 20 °C, the holding-current profile is captured at the rated voltage, the response time is measured at the rated pressure, and the connector-seat verification confirms the pinout and the seal carrier. A valve that fails any one of those five checks is segregated from the production line and disposed of through a rework-or-scrap decision that our engineering manager signs off on. Our documentation team records the five measured values on the per-unit record; the per-shipment documentation package bundles those records with the lot number and the calibration profile. The distributor’s incoming-inspection team can pull the records into their quality system without a phone call back to our office.

For distributors who want to consolidate the two references into a single programmable SKU, our team quotes the programmable variant against either OEM number, with the calibration loaded at the bench per the distributor’s fleet specification. Bosch Automotive, Knorr-Bremse, WABCO, and Haldex all publish comparable ABS-system specifications that our engineering team references when validating the calibration map against the OEM number. The cross-reference is part of the per-shipment documentation; the distributor’s reliability engineer can audit the engineering rationale without a phone call back to our office.

For distributor inquiries on the 1934981 and 3099148 SKUs, our foreign trade team handles requests through the company’s contact channel with the OEM number, the connector variant, and the chassis fitment listed on the inquiry. We respond with a per-unit calibration profile, a per-shipment documentation preview, and a price band within 24 hours for distributor accounts and 48 hours for first-time buyers. The price band is the OEM-equivalent valve in single-SKU quantity; volume discounts apply at lot sizes above 500 units per SKU, and the per-shipment documentation package is included in the unit price for distributor accounts.

Frequently Asked Questions

Can I install a Scania 1934981 in a Volvo truck without an adapter?
Not safely. The connector keyway and the seal carrier are dimensioned differently, and the Volvo ECU’s learned-current handshake is narrower than Scania’s. A direct swap either fails to seat or seats and produces a soft ABS fault after the first few ignition cycles. Use a harness adapter with a calibrated resistor and an ECU handshake reset.

Can I install a Volvo 3099148 in a Scania truck without an adapter?
Same answer in reverse. The connector and the ECU handshake are the discriminator, not the voltage envelope. A direct swap is not recommended; a harness adapter and an ECU reset are required.

What is the working pressure for both references?
Both valves are rated to 13 bar working pressure at the modulator port. The pressure envelope is the same on both sides; the divergence is in the connector and the calibration map.

What is the coil resistance at room temperature?
Scania 1934981: 7.5-9.5 Ω. Volvo 3099148: 7.0-9.0 Ω. The overlap is intentional — the coil architecture is similar — but the ECU’s learned-current window treats each range separately.

Do you ship a programmable version that covers both OEM numbers?
Yes. Our team produces a programmable 24V ABS solenoid variant that can be calibrated at the bench to either the Scania or the Volvo profile. The programmable variant carries a price premium over the fixed-calibration valve and pays for itself at fleet scales where the inventory carrying cost of two SKUs exceeds the per-unit price difference.

How does your quality system verify the calibration before shipment?
Our quality team runs each production lot through a 100% bench test that captures the coil resistance, the holding-current profile, the response time at rated pressure, and the connector-seat verification. The measured values are recorded on the per-unit record, which is part of the documentation package that ships with the order.

What is the difference between the Scania bayonet connector and the DIN 72585 connector?
The Scania bayonet is dimensioned for the Scania harness family; the keyway orientation differs from DIN 72585, and the seal carrier is dimensioned for the Scania loom. A DIN 72585 valve in a Scania harness either fails to seat or loses the IP6K7 seal at the connector interface. The Volvo connector is closer to DIN 72585 but still uses a different seal carrier and locking collar.

Why is the learned-current handshake on the ECU important for the substitute valve?
The ABS or EBS ECU does a learned-current handshake on power-up to confirm the valve’s coil resistance is inside the expected window. If the substitute valve’s coil resistance drifts outside that window, the ECU flags a soft fault and the dashboard ABS light stays on. The fault is not a hard failure; the ABS still functions, but the truck fails inspection at the next commercial-vehicle test.