Motronic MED 17.5
Substitute Functions in Case of Sensor/Actuator Failure
Symptom in
Case of Failure
Substitute
Signal
Power Emergency
Limitation Operation
DTC Entry
MIL
EPC
No Cruise
Control
F63
Yes
No
No
No
No
No
G39
G61
G62
No Control
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
No
Yes
No
No
No
No
No
No
Yes
Radiator
Fan Runs
G83
No
No
No
No
No
No
Permanently in
Setting 1
No Throttle
Response
G79/G185
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
No Throttle
Response
G187/G188
G247
G336
No High Pressure
No
Yes
Yes
Yes
Yes
No
No
No
No
Yes
No
Yes
No
No Cruise
Control
G476
Yes
No
No
No
No
No
No Power Supply
to ECM –
J271
No
No
No
No
No
No
Engine Not
Running
J538
J757
No
Yes
Yes
Yes
Yes
No
No
No
No
No
No High Pressure
Yes
Yes
Yes
Engine Not
Running
Smoothly
Ignition
Coils
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Engine Not
Running
Smoothly
N30-N33
N75
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes
No
Yes
No
N205
N276
N316
No
No High Pressure
No
Yes
No
Yes
No
Yes
No
This table refers to generally occurring faults. It is not a substitute for diagnosing with the
“Guided Fault Finding” function. The parameters specified in the table are subject to deviation
depending on fault type. Specifications are subject to change due to updating of ECM software.
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