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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING 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
Adaptation
To obtain the best possible performance from the LH system it is extremely important for adaptation of the system to be carried out, both at idling speed and while the car is being driven.
Adaptation affects drivability, and also diagnostic trouble code detection, to a high degree. Adaptation of the system should be carried out in connection with the replacement of components or when any other work is carried out on the system.
Adaptation normally takes place while the car is being driven but to accelerate the process the following adaptation procedure can be used:
Idling
1 Start the engine and warm it up. When it has reached normal operating temperature, switch it oft.
2 Clear any fault codes and zeroes the adaptation levels by unplugging the LH control module connector for about 1 minute. Then plug the connector in again.
3 Start the engine and run it at idling speed for at least 2 minutes.
4 Switch off the engine and repeat point 3.
Driving
WARNING: Do not take out the ignition key when the ignition switch has been moved to the OFF position as this engages the steering column lock and could be the cause of an accident.
1 With the engine properly warmed up, drive the car at a speed of 70 km/h.
Manual gearbox Declutch, switch off the engine and then immediately start it again.
Automatic transmission Move the selector lever to the N position. Switch off the engine and then immediately start it again.
2 Repeat the above procedure.
To obtain the best possible performance from the LH system it is extremely important for adaptation of the system to be carried out, both at idling speed and while the car is being driven.
Adaptation affects drivability, and also diagnostic trouble code detection, to a high degree. Adaptation of the system should be carried out in connection with the replacement of components or when any other work is carried out on the system.
Adaptation normally takes place while the car is being driven but to accelerate the process the following adaptation procedure can be used:
Idling
1 Start the engine and warm it up. When it has reached normal operating temperature, switch it oft.
2 Clear any fault codes and zeroes the adaptation levels by unplugging the LH control module connector for about 1 minute. Then plug the connector in again.
3 Start the engine and run it at idling speed for at least 2 minutes.
4 Switch off the engine and repeat point 3.
Driving
WARNING: Do not take out the ignition key when the ignition switch has been moved to the OFF position as this engages the steering column lock and could be the cause of an accident.
1 With the engine properly warmed up, drive the car at a speed of 70 km/h.
Manual gearbox Declutch, switch off the engine and then immediately start it again.
Automatic transmission Move the selector lever to the N position. Switch off the engine and then immediately start it again.
2 Repeat the above procedure.
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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.