· Engine running at idle speed
· Vehicle speed less than 1
km/h (0.6 mph)
· Coolant temperature higher than 75 °C/167 °F
· Throttle valve aperture less than 2 %
· Following trouble codes not stored: 21, 22, 24
· Nominal idle speed is not maintained; the
deviation
is greater than 75 rpm
· The above conditions must be fulfilled for at
least 19 s
Only for control units up to
Model Year 91: C 14 NZ
· The above conditions must be fulfilled for at
least 1 s
Only for control units as of
Model Year 92: C 12 NZ,
C 14 NZ
If
the speed sensor has malfunctioned and trouble code 24 has not yet been
recognized, trouble code 35 may be set under certain circumstances.
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