· Engine speed
greater than 2000 rpm
· Control unit
reference voltage for knock sensor lower than 10 mV. The value varies
depending on the engine speed
· Knock sensor
voltage is evaluated and indicates an implausible value for
50 consecutive checks (at 100 ms intervals)
Replacement values:
· If the engine load
signal is greater than 4.1 ms and the coolant temperature is higher than
30 °C / 86 °F the control unit retards the firing angle by up
to 10.5 °CA for safety reasons.
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