Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB19879000 L4-1985CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONPROGRAMMING AND RELEARNING
1987 Saab 9000 L4-1985cc 2.0L DOHC
Programming and Relearning
1987 Saab 9000 L4-1985cc 2.0L DOHCSECTION Programming and Relearning
Before Control Module Replacement
When all tests have been carried out according to the relevant diagnostics procedure or by manual fault diagnosis without any faults having been found, it is natural to assume that the control module is at fault.
Therefore, go through the following points carefully before definitely pinpointing the LH control module as the cause of the fault.
1 Check once again that every single point in the fault diagnosis procedure for the relevant diagnostic trouble code has been carried out.
2 Study the wiring diagram of the circuit in question and make sure you understand how it works.
3 Check all grounding points. If you have already done so, do it once again. Check that power ground and sensor are mechanically and electrically separate.
4 Check the power supply for the control module.
5 Check the input and output signals and compare the readings with the tables for the LH system in question.
6 Be restrictive with control module replacement. Unnecessary control module replacement represents a major expense for the customer. Think of every possible cause of the fault before changing the control module.
7 If the fault still persists, the LH control module will have to be changed.
When all tests have been carried out according to the relevant diagnostics procedure or by manual fault diagnosis without any faults having been found, it is natural to assume that the control module is at fault.
Therefore, go through the following points carefully before definitely pinpointing the LH control module as the cause of the fault.
1 Check once again that every single point in the fault diagnosis procedure for the relevant diagnostic trouble code has been carried out.
2 Study the wiring diagram of the circuit in question and make sure you understand how it works.
3 Check all grounding points. If you have already done so, do it once again. Check that power ground and sensor are mechanically and electrically separate.
4 Check the power supply for the control module.
5 Check the input and output signals and compare the readings with the tables for the LH system in question.
6 Be restrictive with control module replacement. Unnecessary control module replacement represents a major expense for the customer. Think of every possible cause of the fault before changing the control module.
7 If the fault still persists, the LH control module will have to be changed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.