FCA CS.00081 Solid and Liquid Contaminant Resistance Specification

The "FCA CS.00081 Specification for Resistance to Solid and Liquid Contaminants," developed by Fiat Chrysler Automobiles (FCA) (now Stellantis), an Italian-American automotive company, is one of the internal component standards focused on solid and liquid ingress testing. This standard specifies environmental and durability requirements (specifically, resistance to water, dust, mud, and similar contaminants) for all electronic or electrical automotive components (engine control units, sensors, modules, connectors, cables, and the like) used in vehicle environments.

This standard is generally applicable to all suppliers of electrical and electronic components to FCA/Stellantis. The purpose of this standard is to ensure that components perform reliably and maintain their appearance after exposure to real-world environmental conditions. These include:

• Water ingress (rain, splash)
• Dust and particle ingress
• Mud and liquid exposure
• Gravel impact (this condition is often detailed in supplementary tests such as the FCA CS.00056 standard)

The FCA CS.00081 standard generally includes:

• Preconditioning of components (e.g. combustion, operating cycles)
• Exposure to environmental stressors such as water jets, dust chambers, mud spraying
• Simultaneous functional testing (must function correctly during and after exposure)
• Post-test review:
  • There should be no degradation of functionality, error codes or intermittent malfunctions
  • The appearance must meet standards (no unacceptable damage)

The method described in FCA CS.00081 is not a standalone test method. It complements other environmental tests in FCA's series of component standards. For example,

• CS.00056 Gravel bombardment
• 7.G2051: Corrosion/wear assessment

This standard is part of a package intended to simulate real-world durability, from gravel to liquid ingress and corrosion resistance.

In addition to functional integrity, this standard requires components to maintain cosmetic integrity, such as surface requirements and appearance. Namely,

• There should be no cracks, peeling coating or paint defects.
• Must meet FCA's drawing requirements (including for metallic parts) (this illustrates FCA's emphasis on appearance across standards, even though the reference is for hose assemblies).

The FCA CS.00081 standard is important because it directly protects the functional integrity and safety of a vehicle's electronic and electrical components in harsh environmental conditions. This standard is considered important for the following reasons:

• Prevents component failures: Modern vehicles are heavily reliant on electronic control units, sensors, and wiring. Dust, water, mud, or other contaminants can
  • May short-circuit components
  • May corrode internal parts
  • May disrupt data communication
  • May cause misdiagnosis or vehicle malfunctions

This standard ensures that these components continue to function even after exposure to such elements.

• Ensures passenger safety: Failures in electronic systems like brakes, steering, airbags, and advanced driver assistance systems can have catastrophic consequences. This standard prevents safety-critical failures due to environmental exposure through rigorous solid and liquid ingress testing, ensuring the reliability of these life-saving systems.
• Protects vehicle reliability and customer satisfaction: If components fail prematurely due to dust or water ingress, drivers lose confidence in the vehicle brand, and OEMs face costly recalls, warranty claims, and reputational damage. This standard helps OEMs and suppliers deliver durable, long-lasting parts that meet customer expectations.
• Adapts to real-world driving conditions: Cars are used in all types of climates and terrains: rain, snow, desert, off-road, and more. This standard simulates these conditions and ensures:
  • Parts operate globally, from deserts to the tropics.
  • The vehicles meet international performance standards.
• Increases supplier quality and accountability: By standardizing testing, FCA/Stellantis ensures:
  • All suppliers meet the same environmental durability expectations.
  • There are clear criteria for accepting/rejecting parts during design and production.
• Supports compliance with other regulations: This standard aligns with broader regulatory and automotive quality systems (such as ISO 16750, LV124, or USCAR standards). It primarily helps:
  • Performing due diligence in parts verification.
  • Facilitating certification and homologation processes in global markets.

The basic test procedures described in the FCA CS.00081 standard are:

• Dust ingress: In this method, components are placed in a dust chamber to test their resistance to fine particle ingress.
• Water column testing: In this method, a pressurized water column is applied to evaluate the sealing effectiveness against rain, splashes or jets.
• Mud fill/mud spray test: In this method, components are coated with mud and dried to check for ingress under real field conditions or contaminated environments.
• Salt water immersion/salt fog testing: In this method, components are exposed to salty environments to test corrosion performance both during and after entry.
• Chemical exposure testing: This method tests for resistance to automotive fluids, detergents or other chemicals that may come into contact with external components.
• Appearance and function testing: In this method, during and after all exposures, components are functionally tested (electrical operation, diagnostics) and visually inspected to ensure there is no unacceptable damage.

The typical test sequence for these tests is as follows:

• Preconditioning: The burn-in, operational cycle, or functional baseline is established.
• Environmental exposures: Dust, water jets/column, mud compaction, salt fog/water immersion, chemical spray applied.
• Simultaneous functional tests: Tests are performed during operation at some exposure stage.
• Post-exposure inspection: Functionality is retested, checked for faults/water/dust, and cosmetic integrity is inspected.

Incidentally, this standard does not specify a precise dust mass, but instead relies on the ISO 20653 standard ingress protection (IP) levels to classify the required dust resistance according to component location.

As a result, the FCA CS.00081 standard ensures that electrical components are not only isolated from the environment but also verified against real-world environmental stressors. Used in conjunction with other CS series tests, it represents a fundamental pillar of FCA/Stellantis' approach to component durability, reliability, and quality assurance.

In short, this standard ensures that components remain functionally and visually intact under harsh environmental conditions, from dusty deserts to muddy off-road conditions and salty coastal climates. By combining indoor exposure, live functionality checks, and rigorous appearance criteria, it gives suppliers and vehicle manufacturers confidence in the durability of their electrical components.

Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services to businesses in accordance with the "FCA CS.00081 Specification for Resistance to Solid and Liquid Contaminants" standard.