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Crankshaft Sensor Replacement
 
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Pelican Technical Article:

Crankshaft Sensor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$130

Talent:

*****

Tools:

10mm socket, flathead screwdriver, DVOM

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Crankshaft position sensor

Hot Tip:

Work with a cool engine

Performance Gain:

Car will start and run well

Complementary Modification:

Replace air filter

The digital motor electronics (DME) engine management systems in Volvo V70 vehicles uses the engine control module (ECM) to control fuel injection, ignition and other important drivetrain functions. The ECM sequentially triggers the fuel injectors to spray fuel into the intake ports and then, a split-second later, triggers the ignition coils to fire the spark plugs. This sequence of events is timed by using the crankshaft position. Using the signal from the crankshaft sensor, the ECM knows which cylinder is ready for fuel intake and then, later, for ignition.

The crankshaft position sensor is located near the cylinder head, mounted in the transmission bell housing. The sensor reads a toothed reluctor wheel mounted to the end of the flywheel or torque converter. It then sends a signal to the DME used to identify cylinder location. If this signal is missing, for example from a faulty crankshaft sensor, then the engine will not start. You can consider the signal from the crankshaft sensor the RPM signal for the DME.

In this article, I'll go over the steps involved with replacing the crankshaft position sensor.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The crankshaft position sensor (green arrow) is located near the cylinder head, mounted in the transmission bell housing near the radiator hose (red arrow).
Figure 1

The crankshaft position sensor (green arrow) is located near the cylinder head, mounted in the transmission bell housing near the radiator hose (red arrow).

Working at the intake air boot between the throttle housing and intake air housing, disconnect the electrical connector (red arrow) by pressing the release tab and pulling the connector straight off.
Figure 2

Working at the intake air boot between the throttle housing and intake air housing, disconnect the electrical connector (red arrow) by pressing the release tab and pulling the connector straight off.

Disconnect the breather hose (red arrow) by pulling it straight off the intake air duct.
Figure 3

Disconnect the breather hose (red arrow) by pulling it straight off the intake air duct.

Then, loosen the intake air duct clamps (green arrows).
Figure 4

Then, loosen the intake air duct clamps (green arrows).

Remove the intake air duct from the intake air housing and throttle housing.
Figure 5

Remove the intake air duct from the intake air housing and throttle housing. Then disconnect the breather hose (red arrow) located at the bottom of the duct (green arrow).

Use a long extension and a 10mm socket, remove the crankshaft sensor fastener (green arrow).
Figure 6

Use a long extension and a 10mm socket, remove the crankshaft sensor fastener (green arrow).

Once the fastener is removed, check that the sensor is free by moving it side to side (red arrow).
Figure 7

Once the fastener is removed, check that the sensor is free by moving it side to side (red arrow). This also helps to free up a slightly frozen sensor.

Working at the throttle housing, remove the four 10mm fasteners (green arrows).
Figure 8

Working at the throttle housing, remove the four 10mm fasteners (green arrows).

Pull the throttle housing off the intake manifold and lay it aside.
Figure 9

Pull the throttle housing off the intake manifold and lay it aside.

Working at the lower front corner of the cylinder head, near the throttle housing mounting bore, remove the camshaft and crankshaft wiring harnesses (green arrow) from the plastic mounts (red arrow).
Figure 10

Working at the lower front corner of the cylinder head, near the throttle housing mounting bore, remove the camshaft and crankshaft wiring harnesses (green arrow) from the plastic mounts (red arrow). Both have to be removed to get the crankshaft harness free.

Working beneath the intake manifold, locate the crankshaft sensor electrical connector (yellow arrow).
Figure 11

Working beneath the intake manifold, locate the crankshaft sensor electrical connector (yellow arrow). The red arrow points to the intake manifold for orientation. You will do most of this part by feel, as it is difficult to see the sensors. Press the release tab (green arrow) while pulling the connector end (yellow arrow) apart.

Pull the crankshaft sensor out of the transmission bell housing.
Figure 12

Pull the crankshaft sensor out of the transmission bell housing. Feed the harness out of the engine with the sensor.

This photo shows the sensor removed from the engine.
Figure 13

This photo shows the sensor removed from the engine. To replace the sensor, route the wiring as it was before. Then install the sensor into the transmission bell housing and tighten the fasteners. Connect the electrical connector and install the remaining items. Clear all fault codes from the DME when complete.


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