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From The Saab Tech Wiki
==Overview==
The Crankshaft Position Sensor is part of the Trionic engine management system. It generates a signal used by the ECM to calculate RPM and engine TDC. Typical life of the sensor is 100-150K miles. The original sensor is manufactured by Bosch, dealer list price $141, or ~$100 online. Crankshaft position sensors are simple inductive sensors, consisting of a magnet, a wire coil, housing, cable and connector. Generic equivalents like the one pictured above typically cost ~$50.
[[file:900_9-3_Crank_Position_Sensor_01.jpg|thumbnail|none|Fig. 1 - Crankshaft Position Sensor Location]] [[file:900_9-3_Crank_Position_Sensor_02.jpg|thumbnail|none|Fig. 2 - Crankshaft Position Sensor and Cable]]
===No-Start===
===Coil Resistance===
The resistance of the sensor coil can be measured across connector pins 1 and 2, and should be within about 10% of the nominal value (At 20C temp). Both pins should test "open" to pin 3. If not, the sensor should be replaced. However, resistance is not always proof of a good sensor.
[[file:900_9-3_Crank_Position_Sensor_14.gif|thumbnail|none|Fig. 3 - Crankshaft Position Sensor Connector]]
==Access==
===Sensor Connector===
The connector for the crankshaft position sensor is located under the engine cover, tucked below other wiring and hoses behind the engine. The cable is usually held in place with a plastic cable tie which has to be cut before the connector can be unplugged.
[[file:900_9-3_Crank_Position_Sensor_03.jpg|thumbnail|none|Fig. 4 - Crankshaft Position Sensor Connector]]
===Turbo Hoses===
* Remove the Charge Air Pipe (3)
* Plug the open pipes with a towel
[[file:900_9-3_Crank_Position_Sensor_04.jpg|thumbnail|none|Fig. 5 - Crankshaft Position Sensor Turbo Hoses]]
====900SE Turbo====
===Battery and Power Steering Hose===
Remove the battery. Unclip the power steering suction line below the battery tray and remove a single 10-mm bolt holding the pipe above the fan. Do not disconnect the p/s hose clamps!
[[file:900_9-3_Crank_Position_Sensor_06.jpg|thumbnail|none|Fig. 6 - Battery and Power Steering Hose]]
===Radiator Fan===
Remove two 8-mm bolts holding the fan and unplug the electrical connectors. Push the suction line toward the engine and pull the fan out between the power steering line and the front of the engine compartment.
[[file:900_9-3_Crank_Position_Sensor_05.jpg|thumbnail|none|Fig. 7 - Radiator Fan]]
==Removal==
===Sensor Retaining Bolt===
Use PB Blaster or liquid wrench to loosen the torx bolt, which may be rusted. Remove the bolt using a ratchet with an extension, and a T-30 torx bit. Use a new and sharp torx bit and gently tap it into the bolt head with a hammer to loosen rust and help the end of the bit bite into the bolt.
[[file:900_9-3_Crank_Position_Sensor_07.jpg|thumbnail|none|Fig. 8 - Crankshaft Position Sensor Retaining Bolt]]
===Tool Clearance===
On the 900SE turbo, pass the extension under the downpipe. The picture is after removal of the fan, and shows a ratchet with a 6-inch extension. (With the fan in place, the extension would have to be shorter to allow the ratchet handle to clear the fan.)
[[file:900_9-3_Crank_Position_Sensor_08.jpg|thumbnail|none|Fig. 9 - Crankshaft Position Sensor Tool Clearance]]
===Crankshaft Position Sensor===
Remove the sensor from the engine block, with the old o-ring and the support collar. Unclip the sensor cable from the coolant pipe on the side of the engine, and remove the sensor. Save the bolt, the support collar and the two clips.
[[file:900_9-3_Crank_Position_Sensor_09.jpg|thumbnail|none|Fig. 10 - Removing Crankshaft Position Sensor]]
==Replacement==
===Sensor===
The sensor on the right is a generic replacement from a chain auto part store, for about $55. Clean the sensor seating surface. Install the new sensor in the engine block with the support collar and a new o-ring. Tighten the retaining bolt to about 6 lb-ft. Do not overtighten.
[[file:900_9-3_Crank_Position_Sensor_11.jpg|thumbnail|none|Fig. 11 - Crankshaft Position Sensor]]
===Support Collar and O-ring Seal===
Note the relative position of the o-ring and collar. If the new sensor does not come with one, the collar may be reused.
[[file:900_9-3_Crank_Position_Sensor_10.gif|thumbnail|none|Fig. 12 - Crankshaft Position Sensor Collar and O-Ring Seal]]
===Sensor Cable===
Attach the cable to the same coolant pipe with the two clips. Route the cable around the back of the engine in the same location as the original. The cable is fairly rugged and has a braided wire shield under the insulation, but should not be bent at sharp angles, "kinked", or pinched by the clamps.
[[file:900_9-3_Crank_Position_Sensor_12.jpg|thumbnail|none|Fig. 13 - Crankshaft Position Sensor Cable]]
===Connector===
Plug the sensor connector in behind the engine, and secure the cable slack to the fuel rail harness with a plastic cable tie.
[[file:900_9-3_Crank_Position_Sensor_13.jpg|thumbnail|none|Fig. 14 - Crankshaft Position Sensor Connector]]
===Fan and Battery (if removed)===
===Retaining Bolts Spec===
Torx T-30, M6x100
6 lb-ft torque
===Tools===
