Wiring of the Ignition Sensor Unit (ISU)

In order to transfer the ignition pulse of the first cylinder in the firing order to the ignition input of the DetCon, the ignition sensor unit (ISU) is installed between the ignition output of the first cylinder and the primary side of the ignition coil of the first cylinder. The jumper with the designation Load Resistance must not have been 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 knocking sensors, the ignition sensor unit is mounted on the cylinder on which the first knocking sensor is mounted.

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

No.

Connection

1

DetCon ignition input (Timing1, black)

2

DetCon ignition input (Timing2, 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 Ignition Pulse.

23_Stecker_DetCon_ISU