PIN SIGNAL DESCRIPTION CHART

Pin No.	Signal type	Description
1	Ignition trigger cylinder 4, in	Synchronization of ionization current measurement for cylinder 4.
2	Ignition trigger cylinder 3, in	Synchronization of ionization current measurement for cylinder 3.
3	Knock signal, out	Knock signal, raw value to ECM.
4	Combustion signal 1, out	Combustion signal, raw value to ECM.
5	n/c
6	n/c
7	Ionization signal 2, in	Ionization signal from ignition coil cylinder 2.
8	Ionization signal 3, in	Ionization signal from ignition coil cylinder 3.
9	Ignition trigger cylinder 1, in	Synchronization of ionization current measurement for cylinder 1.
10	Ignition trigger cylinder 2, in	Synchronization of ionization current measurement for cylinder 2.
11	Combustion signal 2, out	Combustion signal, raw value to ECM.
12	B+	Power supply B+ from main relay.
13	B-	power supply B- from grounding point G7.
14	n/c
15	Ionization signal 4, in	Ionization signal from ignition coil cylinder 4.
16	Ionization signal 1, in	Ionization signal from ignition coil cylinder 1.

Fig 1: Ionization Detection Module - Communication Diagram (1 Of 3)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Ionization Detection Module (740): Connection