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.
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HOMESERVICE MANUALSVOLVO1993850 L5-2.4L VIN 55 B5254SREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSABS CODES (ANTILOCK BRAKE SYSTEM CONTROL MODULE)DTC 4-4-4 [EM]PROCEDURESCHECKING HYDRAULIC UNIT CONNECTOR [EM3]
1993 Volvo 850 L5-2.4L VIN 55 B5254S
Checking Hydraulic Unit Connector [EM3]
1993 Volvo 850 L5-2.4L VIN 55 B5254SSECTION Checking Hydraulic Unit Connector [EM3]
Checking Hydraulic Unit Connector
- Ignition off.
- Check hydraulic unit connector C/ED for contact resistance and oxidation as per HA6. Contact Resistance and Oxidation [HA6]
- Connect hydraulic unit connector.
Connect an ohmmeter between combination relays connector terminal 9 and #3 on test box.
Ohmmeter should read approx. 0 Ohms.
If reading is OK:
- DTC was due to poor contact in hydraulic unit connector C/ED.
If reading is incorrect:
- Check resistance in hydraulic unit EM4. Checking Resistance In Hydraulic Unit [EM4]
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.