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Check: knock detection function — variant 6 Peugeot 806 I

Power unit

ECU information available

Actuators test: no

Parameter measurements: no

Characterised by

  • Short circuit to positive or open circuit
  • Short circuit to earth
  • Coherence
  • Not specified (short circuit to earth or short circuit to positive or open circuit, coherence)

Checks to be carried out if fault is present

Short circuit to positive or open circuit

conditions under which the fault appearschecks to be made conditions for checking
engine running engine speed above 2600 rpmcheck: - ignition on, ECU connected: - 12 V absent on terminal B3 of connector 32 V.NR (control unit) - 12 V absent on terminal C3 of connector 32 V.NR (control unit) warning: if 12 V is present for 2/3 seconds after switching on the ignition, short circuit with a function supplied by +ve after relay engine running: - 0 V ≤ U peak ≤ 1 V when accelerating fiercely, between terminals B3 and C3 of the control unit connector 32 V.NR

Short circuit to earth

conditions under which the fault appearschecks to be made conditions for checking
engine running engine speed above 2600 rpmcheck: - ignition off, control unit disconnected: - no earth at terminal B3 on the 32 V.NR connector (control unit) - no earth at terminal C3 on the 32 V.NR connector (control unit) - R ≃ 199,9 kΩ between terminals B3 and C3 of the control unit connector 32 V.NR engine running: - 0 V ≤ U peak ≤ 1 V when accelerating fiercely, between terminals B3 and C3 of the control unit connector 32 V.NR

Coherence

conditions under which the fault appearschecks to be made conditions for checking
engine running engine speed above 2600 rpmcheck, engine running, engine speed less than 5000 revs/min: - 0,1 ≤ U peak ≤ 0.3 volts between ECU terminals B3 and C3 securing of knock sensor

Not specified (short circuit to earth or short circuit to positive or open circuit, short circuit, coherence)

conditions under which the fault appearschecks to be made conditions for checking
engine running engine speed above 2600 rpmcheck: ignition on, ECU connected: - 12 V absent on terminal B3 of connector 32 V.NR - 12 V absent on terminal C3 of connector 32 V.NR warning: if 12 V is present for 2/3 seconds after switching on the ignition, short circuit with a function supplied by +ve after relay engine running: - 0,1 ≤ peak ≤ 1 V when accelerating fiercely (between terminals B3 and C3 of the control unit connector 32 V.NR) engine running, engine speed less than 5000 revs/min (steady speed) - 0,1 ≤ U peak ≤ 0.3 V between terminals B3 and C3 of the control unit connector 32 V.NR securing of knock sensor (2 ± 0,5 da.Nm)

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