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 MANUALSSAAB19949000 HATCHBACK L4-2290CC 2.3L DOHCREPAIR AND DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSANTILOCK BRAKES / TRACTION CONTROL SYSTEMSVACUUM PUMP, BRAKE SYSTEM
1994 Saab 9000 Hatchback L4-2290cc 2.3L DOHC
Vacuum Pump, Brake System
1994 Saab 9000 Hatchback L4-2290cc 2.3L DOHCSECTION Vacuum Pump, Brake System
οΏ½οΏ½(Vacuum Pump, Brake System:
WIRING DIAGRAM
Vacuum Pump, Brake System: Component Location:
COMPONENT LOCATION VIEW
Vacuum Pump, Brake System: Component ID:
COMPONENT ID
1 Battery in the engine bay.
75 Distribution block, battery positive.
29 Brake lights switch beside the pedals.
342a Main fuse board in the engine bay.
458 Vacuum switch.
459 Vacuum pump.
460 Relay, vacuum pump, on the main relay board in the engine bay.
10-Pin Connector
H10-15 Behind the left-hand headlamp.
24-Pin Connector
H24-2 Behind the left-hand headlamp.
70-Pin Connector
H70-1 In the engine bay, behind the bulkhead partition.
Grounding Points
G2 Grounding point, behind the battery on the left-hand wheel housing.
G25 Grounding point, on the gearbox.
DESCRIPTION OF OPERATION
To boost the vacuum for the brake servo, a vacuum pump has been introduced on certain models.
When engine vacuum is insufficient, pressure switch 458 closes and grounds the coil in relay 460. The relay operates and motor 459 is supplied with current (+30 circuit) via fuse 13.
The vacuum pump runs until the right vacuum level is attained. The pressure switch then opens and the pump stops.
The relay coil is supplied with current (+54 circuit) via fuse 9.
FAULT DIAGNOSIS HINTS
1. Check that fuses 13 and 9 are intact and supplied with current.
2. Check that distribution terminal 231 is supplied with current.
3. Check the performance of the pressure switch.
4. Check the wiring harness, connectors and ground connections.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.