Description of On-Board Diagnostics

ISAT DIAGNOSTICS
Communication between the MOTRONIC control module and an Intellegant Saab Tester (ISAT) is possible via pin 55. Communication is two-way and accordingly consists of both input and output signals.

With the ignition switch in the Drive position and the Intellegant Saab Tester (ISAT) in communication with the system, the voltage applied to pin 55 should be about 10 V.

The diagnostics socket is located underneath the dashboard on the driver's side of the car.

Lamp Flash Codes
To comply with legal requirements in the US market (OBD 1), it must be possible for emission-related faults to be signalled by means of flash codes on the CHECK ENGINE lamp (MIL).

The connection (L lead) between pin 13 of the control module and pin 6 of the diagnostics socket is utilized to activate flash codes.

A list of available lamp flash codes will be found in "Lamp Flash Codes" at System Diagnosis/Procedures/Diagnostic Charts. Engine Control Systems

The ISAT can NOT be used for activating lamp flash codes.

IMPORTANT: Care must be taken when grounding pin 6 of the diagnostics socket to activate lamp flash codes as the adjacent pins might be live.