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 MANUALSSAAB20009-3 CONVERTIBLE (9400) L4-2.0L TURBO (B205)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONDETAILED DESCRIPTIONGROUND
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)
Ground
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)SECTION Ground
Power ground
The following are grounded to grounding point G7:
- control module pins 25, 47 and 62
- mass air flow sensor
- ignition discharge module.
Sensor ground
The following sensors are grounded from control module pins 22 and 70. The two supplies are internally coupled together in the throttle body.
- Crankshaft position sensor and its screen
- Manifold absolute pressure sensor
- Charge air absolute pressure sensor
- Differential pressure sensor, tank
- Intake air temperature sensor
- Temperature sensor, engine coolant
- Oxygen sensor screens
- Pedal position sensors
- Throttle position sensor
Reference ground
Oxygen sensors 1 and 2 are grounded from control module pin 58.
Diagnostics
- The engine will not start if the power ground is missing and the diagnostic tool will not be able to make contact with the system.
- The engine will not start it the sensor ground is missing and the throttle will go into limp-home mode. As the two sensor ground outputs are coupled together internally in the throttle body, there will be no symptoms if a break should occur in on one of them.
- If the reference ground is missing, diagnostic trouble code P0134 will be generated.
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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.