900 Turbo Convertible L4-1985cc 2.0L DOHC Turbo EFI (1994)
Technical Service Bulletin # 340-1722
Date: 970901
Ignition Discharge Module - Pre-Replacement Check
SI No. 340-1722
PI No. 2/97 Group 3 D 2.0
Date September 1997
Distr. all
900
Pre-replacement check of ignition discharge module
Cars affected
All cars with electronic ignition
Background
Because there is no diagnostic tool specifically for the ignition discharge module. it can be difficult to measure certain of the module's functions. Saab
has now produced a special test module, Part. No. 83 95 279 (CA:30567748). This module, used together with the other special tools and diagnostic
procedures, makes it possible to test the ignition discharge module and thereby avoid unnecessary replacements.
The test module is a standard ignition discharge module, except that ports have been provided between the mounting holes on the sides of the module. A
hole for hanging the module has been provided, and the module is painted blue. The test module has undergone comprehensive function checks during
both factory and road tests.
Materials
Test module: 83 95 279 (CA: 30567748)
See SI 103-1813 for information on this tool.
Procedure
WARNING
High-voltage ignition system--proceed with caution. Never touch the ignition discharge module when the starter is running or during filament
burn-off (when turning the ignition key to OFF). The high voltages present can be fatal to people with weak hearts or pacemaker implants.
Before starting work, determine the fault symptoms described by the customer.
Most problems are caused by one of the following faults. Always check for these first and rectify them, as necessary, before starting any additional
diagnosis work. After each fault has been rectified, check to see whether the fault symptoms are still there.
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Module connections (both inside the module and in the electrical circuit)
