9-3 Viggen Coupe (9400) L4-2.3L Turbo (B235) HO (1999)
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If there is no match with diagnostic trouble codes or symptoms, the technician must diagnose the fault himself.
A final check must be performed after the repair.
Good technical product knowledge is required to solve this type of problem.
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The work on the car is finished.
General fault diagnosis in electronic Systems
Control module
When the control module is supplied with current, the processor in it is tripped. The processor then reads the instructions stored in the control module's
memory.
The control module is programmed to read the inputs and activate the outputs. If the control module program is defective, the diagnostic trouble code
"Internal Control Module Fault" will be generated.
The control module must be supplied with current before the system will function. The control module is supplied with current and the processor tripped
when the control module can be contacted by the diagnostic instrument.
Outputs
The purpose of the system is to control a number of functions by means of various actuators, e.g. an injector or a lamp. For the system to be capable of
performing its functions, it must be possible to activate the actuators. For this reason the actuators must be connected to the control module and have a
proper power supply or ground connection.
Inputs
A condition before the control module's capability of controlling its actuators is that the system sensors supply the control module with correct values.
Sensor performance can be checked with the diagnostic instrument.
Tech2 Menu Structure, read, activate, adj, program, system info
Diagnostic trouble codes (DTC)
Read Values/Activate
Adjustment
Programming
Snapshot
System Information
Menu "Read Values"