P1640 Engine Management System

Fault symptom
Car fails to start.

Condition
Diagnostic trouble code (DTC) P 1640 stored in the engine management system if alarm code absent.







Diagnostic procedure
1 Check the diagnostic trouble code (DTC) in the engine management system
- Connect an Intelligent Saab Tester (ISAT) scan tool.
- Ignition switch in the "ON" position.
- Select "TRIONIC" or "MOTRONIC 2.8.1", as appropriate.
- Select "READ FAULT CODES".

Is diagnostic trouble code (DTC) P1640 stored?
[YES] Continue with point 2.
[NO] Continue fault diagnosis of the engine management system as described in Service Manual 2:7.

2 Check the alarm code status in VSS
- Select "THEFT ALARM".
- Select "READ VALUES".
- Select "ALARM CODE".

Is the alarm code correct?
[YES] Continue with point 3.
[NO] The alarm code is incorrect or absent. Continue fault diagnosis of the engine management system as described in Service Manual 2:7.

3 Final test
Start the car and check to see if the fault symptom persists.

Does the trouble persist?
[YES] Continue as described in "Before Changing the Electronic Control Module". Before Changing the Electronic Control Module
[NO] The remedial measure taken was correct or the fault is of intermittent nature.