LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 1993 >> 850 Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System & Traction Control System >> Diagnosis & Testing >> Abs/TRACS Diagnostic Trouble Code Tests >> Code 4-4-1: Control Module Fault
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 4-4-1: Control Module Fault

  1. Control module is fitted with dual microprocessors. To compare results, microprocessors carry out all calculations in parallel. Code sets when control module detects that calculations do not correspond with each other.
  2. Connect test box to control module. See USING TEST BOX (981 3190) under SELF-DIAGNOSIS. Check control module by connecting an ohmmeter between control module housing and ground, then between test box terminal No. 1 and ground.
  3. If ohmmeter indicates continuity in both cases, ensure wheel sensor wiring is not too close to sources of interference (electric motors, phone connections, etc.). If wheel sensor wiring is okay, erase code and test drive vehicle. See TEST DRIVING VEHICLE. If code reoccurs, replace control module. If ohmmeter indicates an open circuit in both cases, replace control module.
scientia non olet · About LEMON Manuals