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Home >> Volvo >> 1993 >> 850 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Code Testing >> Ignition System Trouble Code Diagnosis >> 1-2-3 (Engine Temperature Sensor Signal Absent Or Faulty)

1-2-3 (Engine Temperature Sensor Signal Absent Or Faulty)

  1. Activate diagnostic test mode No. 1 and check if codes have been set by fuel injection (socket No. 2) and instrument panel (socket No. 7) systems. See DIAGNOSTIC TEST MODE NO. 1 under SELF-DIAGNOSTICS  . If fuel injection Code 1-2-3 and instrument panel Codes1-2-1 and 1-2-2 are displayed, check fuel injection Code 1-2-3.
  2. If code is present in ignition system and instrument panel but not in fuel injection system, go to next step. If code is not recorded in fuel injection system or instrument panel, go to step 4).
  3. Check for an open or short circuit between fuel injection and ignition system terminals No. 53 (Green/Gray wire). If wire is okay, repeat test using new fuel injection ECU.
  4. If code is present in ignition system but not in fuel injection or instrument panel system, check wire between fuel injection and ignition system terminals No. 53 (Green/Gray wire) for an open circuit. If circuit is okay, repeat diagnosis using new ignition ECU.
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