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Home >> Mercedes Benz >> 1991 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> On-Board Diagnostics Using Mas Unit Memory
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On-Board Diagnostics Using Mas Unit Memory

  1. When engine is running and a fault occurs, any fault codes or malfunctions are also stored in MAS unit memory as well as CIS-E control unit memory.
  2. On 190E Series and 300 Series except 300SE and 300SEL, MAS unit codes can be read using impulse counter connected directly to diagnostic connector pin sockets No. 1 and No. 14.
  3. On 300SE and 300SEL, MAS unit codes can ONLY be read using socket box tester connected between MAS unit and MAS unit connector socket. Connect Black impulse counter lead to diagnostic connector pin socket No. 4. Connect Yellow lead to socket box tester pin socket No. 14.
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