Computer Trouble Codes
Computer Trouble Codes
1990-1993: W201 with 2.3L M102 engine
Flashes Fault
1   No System Malfunction
2   Throttle Valve Swttch
3   Coolant Temperature Sensor
4   Airflow Sensor Position Indicator
5   Oxygen Sensor
6   NotUsed
7   Td Signal
8   Altitude Correction Capsule
9   Electro-Hydraulic Actuator (EHA)
10   Throttle Valve Switch and/or Idle Speed Contact
11   NotUsed
12   EGR Temperature Sensor
1991-??: W124, and W202 with 2.8L & 3.2L M104 engines [W129 & W140?]
Flashes Fault -
1   No faults in system
2   Oxygen Sensor Inoperative
3   Lambda Control Inoperative
4   Air Injection inoperative
5   Exhaust Gas Recirculation (EGR) inoperative
6   Idle Speed Control Inoperative
7   Ignition System Failure
8   Coolant Temperature Sensor - Open Or Short Circuit
9   lntake Air Temperature Sensor - Open Or Short Circuit
10   Voltage At Air Mass Sensor Too High Or Low
11   TN (RPM) Signal Defective
12   Oxygen Sensor Heater Open Or Short Circuit
13   Camshaft Position Sensor Signal From - EZLJAKR Ignition Control Unit Defective
14   Intake Manifold Pressure At Start Too Low
15   Full Throttle Information Defective
16   Idle Speed Information Defective
17   Controller Area Network (CAN) Data Exchange - Malfunction Between Control Units
18   Adjustable Camshaft Timing Solenoid - Open Or Short Circuit
19   Fuel Injectors- Open Or Short Circuit, or Emission Control System Adaptation at Limit
20   Speed Signal Missing
21   Purge Switchover Valve - Open Or Short Circuit
22   Camshaft Position Sensor Signal Defective
23   Intake Manifold Pressure With Engine Running Too Low
24   Starter Ring Gear Segments Defective
25   Knock Sensors Defective
26   Upshift Delay Switch over Valve - Open Or Short Circuit
27   Coolant Temperature Sensor Deviation Between Sensor Circuit No. 1 and Sensor Circuit No. 2
28   Coolant Temperature Sensor (Coolant Temperature Change Monitor)
1991-1993: W124, W126 & W201 with 2.6L & 3.0L M103 engines
Flashes Fault
1   No faults in system
2   Throttle Valve Switch (Full Throttle Contact)
3   Coolant Temperature Sensor
4   Airflow Sensor Potentiometer
5   Oxygen Sensor
6   Not assigned
7   TNA (Engine RPM) Signal
8   Altitude Pressure Signal From EZL Ignition Control Unit
9   Current To Electro-hydraulic Actuator
10   Throttle Valve switch (Idle Contact)
11   Air Injection System
12   AbsoIute Pressure Valves From EZL Ignition Control Unit
13   Intake Air Temperature Signal
14   Road Speed Signal At CIS-E Control Unit
15   Not assigned
16   Exhaust Gas Recirculation (EGR)
17   Oxygen Sensor Signal
18   Current To Idle Speed Air Valve
19   Not assigned
20   Not assigned
21   Not assigned
22   Oxygen Sensor Heating Current
23   Short Circuit To Positive In Regeneration Switch over Valve Circuit
24   Not assigned
25   Short Circuit To Positive in Start Valve Circuit
26   Short Circuit To Positive In Shift Point Retard Circuit
27   Data Exchange Fault Between CIS-E Control Unit and EZL ignition Control Unit
28   Loose Contact In Coolant Temperature Sensor Circuit
29   Difference In Coolant Temperatures Between CIS-E Control Unit and EZL Ignition Control Unit
30   Not assigned
21   Loose Contact In Intake Air Temperature Sensor Circuit
32   Not assigned
33   Not assigned
34   Faulty Coolant Temperature Sensor Signal from EZL Ignition Control Unit