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Home >> Saab >> 1996 >> 9000 CSE V6-2962cc 3.0L DOHC (B308) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Trip Computer >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Fault Diagnosis By Symptom >> Check Engine

Check Engine






Fault symptom
The malfunction indicator lamp does not light, see point 1.

The malfunction indicator lamp is lit continuously despite the fact that no diagnostic trouble code is registered in the engine management system. see point 2.

Action
1 Connect the Intelligent Saab Tester (ISAT) and read "CHECK ENGINE LAMP".
If the display response is ON 0 V, proceed to "Action Before Changing A Control Module".
If the display response is OFF 12 V :
If the car is installed with Trionic engine management system:
Contact the Trionic (10) and activate CHECK ENGINE.
If CHECK ENGINE does not work at ON, check the lead from Electronic Display Unit (EDU) control module pin 12 to Trionic control module pin 32 for open circuit. Localize and remedy the fault.
Connect a BOB to the EDU control module with the connector plugged in to the EDU control module. Ground pin 12 to pin 21.
If the lamp lights, change the Trionic control module.
If the lamp does not light, proceed to "Action Before Changing A Control Module".
If the car is installed with Motronic engine management system:
Contact the Motronic and activate CHECK ENGINE.
If CHECK ENGINE does not work at ON, check the lead between EDU control module pin 12 and Motronic control module pin 22 for open circuit. Localize and remedy the fault.
Connect a BOB on the EDU control module with the connector plugged in to the EDU control module. Ground pin 12 to pin 21.
If the lamp lights, change the Motronic control module.
If the lamp does not light, proceed to "Action Before Changing A Control Module".






2 Connect the ISAT and read "CHECK ENGINE LAMP". Start the engine.
If the display response is OFF 12 V, proceed to "Action Before Changing A Control Module".
If the display response is ON 0 V, switch oft the engine and unplug the connector to the Trionic/Motronic.
Switch on the ignition. If the lamp goes out, change the engine management system control module.
If the lamp does not go out, check the cable assembly between Electronic Display Unit (EDU) control module pin 12 and Trionic control module pin 32/Motronic control module pin 22 for short circuit to ground.
If the fault remains, proceed to "Action Before Changing A Control Module".

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