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Home >> Volvo >> 1992 >> 940 GL, AW70 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostics - Turbo System >> Fault Code Testing >> Code 3-4-2 (A/C Blocking Relay)

Code 3-4-2 (A/C Blocking Relay)

  1. Remove turbo control unit connector. Turn ignition on. Connect voltmeter between turbo control unit terminal No. 6 and ground. Reading should be 12 volts. Turn ignition off. Install control unit connector.
  2. Start engine, and turn A/C on. After A/C compressor has engaged, quickly press accelerator pedal to floor. Compressor should disengage when throttle is fully opened. Turn ignition off.
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