Wiring of the Ignition Sensor Unit (ISU)

The ignition pulse sensor (ISU) is connected in series between the ignition output of the first cylinder and the primary side of the ignition coil of the first cylinder. The ignition impulse of the first cylinder is transmitted in firing order to the DetCon ignition input.

The jumper with the designation Load Resistance has not be removed.

 

Position Load Resistance jumper

The jumper Load Resistance changes the input resistance of the ignition input.

  • Jumper set: 220 
  • Jumper removed: 1 k

It is on the upper left of the device 1.

19a_Jumper-Position

If not all cylinders are fitted with detonation sensors, the ignition sensor unit is installed on the cylinder on which the first detonation sensor is installed.

Principle Circuit Diagram

21_Prinzipschaltbild_ISU

Ignition
controller

Ignition output
1st cylinder

Ignition sensor
unit (ISU)

Primary side of ignition coil
1st cylinder

Ignition coil
1st cylinder

Connections on the Ignition Sensor Unit

22_Stecker_ISU

Pos.

Connection

1

DetCon ignition input (in A, black)

2

DetCon ignition input (in B, brown)

3

Not used

4

Primary side of ignition coil of first cylinder

5

Ignition controller ignition output of the first cylinder

Connections on the DetCon

The ignition sensor unit is connected to the DetCon via the connector Synchronization.

23_Stecker_DetCon_ISU