SL/R230: Fault Code Logic
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From: Gretna, NE
'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
Fault Code Logic
Has anyone seen anything from Mercedes on the logic behind their fault codes? Working on US domestic vehicles, I can often find the set of events (logic) required to trigger a fault code, but I haven't been able to find anything for Mercedes.
As an simple example, a temperature sensor faulty code might get set at any time if the voltage read is < .50V or > 4.50V. A more complicated example would be some of the emissions monitoring where there might be 10-20 prerequisites for starting the monitor, a complex set of conditions to trigger a fault, and often times only a pending code and no MIL until the second fault occurs within x monitoring cycles.
For an example specific to the R230, what will trigger a C1526 Malfunction in pressure supply (ABC)? Other manufacturers would say something like "ABC Pressure Supply - Conditions to initiate monitor: 1) engine running > 10 sec, 2) ambient temperature > -20C, Threshold to trigger: Pressure < 175 bar for 3 sec or Pressure < 150 bar for .5 sec. Red ABC Drive Carefully warning light illuminated while threshold conditions are met. Monitor duration - continuous"
This information would be very valuable for trouble shooting, but I have not been able to find it.
As an simple example, a temperature sensor faulty code might get set at any time if the voltage read is < .50V or > 4.50V. A more complicated example would be some of the emissions monitoring where there might be 10-20 prerequisites for starting the monitor, a complex set of conditions to trigger a fault, and often times only a pending code and no MIL until the second fault occurs within x monitoring cycles.
For an example specific to the R230, what will trigger a C1526 Malfunction in pressure supply (ABC)? Other manufacturers would say something like "ABC Pressure Supply - Conditions to initiate monitor: 1) engine running > 10 sec, 2) ambient temperature > -20C, Threshold to trigger: Pressure < 175 bar for 3 sec or Pressure < 150 bar for .5 sec. Red ABC Drive Carefully warning light illuminated while threshold conditions are met. Monitor duration - continuous"
This information would be very valuable for trouble shooting, but I have not been able to find it.
