On-Board Diagnostic Readout System

Various components of the CIS-E injection system are checked by a microprocessor in the control unit. The failure codes are transmitted by the lambda measuring circuit of the diagnostic socket and are displayed on the Bosch On-Off Ratio Tester (KDJE-P600 ) or Impulse Counter (124 589 19 21 00 ). California models have an on-board test connector, located in engine compartment, equipped with Light Emitting Diode (LED) and push button to activate or flash trouble codes. See Fig 1 .

Fig 1: On-Board Diagnostic Connector (Calif.)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: 190E 2.3L Component Locations

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: 190E 2.6L, 260E, 300CE, 300E & 300TE Component Locations

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: 300SE & 300SEL Component Locations

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 5: 560SL Component Locations

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 6: 420SEL, 560SEL & 560SEC Component Locations

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.