Volvo Parts Catalog Volvo Accessories Catalog Volvo Technical Articles Volvo Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Camshaft Sensor Replacement
 
Bookmark and Share

Pelican Technical Article:

Camshaft Sensor Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$150

Talent:

****

Tools:

10mm socket, flathead screwdriver

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:

Camshaft sensor, fasteners, blue Loctite

Hot Tip:

Work with a cool engine

Performance Gain:

Car will run well

Complementary Modification:

Replace air filter

The digital motor electronics (DME) engine management system in Volvo V70 vehicles with utilize 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 crankshaft position information. Using the signal from the crankshaft sensor, the ECM monitors which cylinder is ready for fuel intake and then, later, for ignition.

However, in addition to the crankshaft position signal, the ECM needs a signal to distinguish the crankshaft valve-overlap top-dead-center (TDC) position from the TDC just prior to the power stroke. This signal is provided by camshaft position sensors, which help synchronize fuel injection and ignition. In addition, camshaft sensors serve as feedback devices for VANOS (variable camshaft timing) control.

When a camshaft sensor fails, the check engine light will illuminate and a fault code will be stored. I have seen faulty sensors cause engine stalling and poor engine drivability. If you have a camshaft sensor fault code and your engine isn't running right, I suggest replacing the sensor before digging too deep.

In this article, I'll go over the steps involved with replacing the camshaft 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.

On V70 base models, the camshaft position sensor is located at the left front corner of the cylinder head.
Figure 1

On V70 base models, the camshaft position sensor is located at the left front corner of the cylinder head. It is possible to have two style sensors. One is replaceable from outside of the housing (green arrow) and one is integrated into the housing (red arrow points to area of this style). This tech article covers the sensor serviced separately of the housing.

Working at the intake air boot between the throttle housing and the 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 the 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).

Working at the camshaft position sensor, remove the 10mm fastener (green arrow).
Figure 6

Working at the camshaft position sensor, remove the 10mm fastener (green arrow). Then remove the 10mm wiring harness mount fastener (red arrow).

Remove the mount from the wiring harness by opening it and pulling the wiring harnesses out of it.
Figure 7

Remove the mount from the wiring harness by opening it and pulling the wiring harnesses out of it.

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.

Pull the camshaft sensor out of the cylinder head.
Figure 10

Pull the camshaft sensor out of the cylinder head.

Working at the lower front corner of the cylinder head, near the throttle housing mounting bore, remove the camshaft wiring harness (green arrow) from the plastic mounts (red arrows).
Figure 11

Working at the lower front corner of the cylinder head, near the throttle housing mounting bore, remove the camshaft wiring harness (green arrow) from the plastic mounts (red arrows).

Working beneath the intake manifold, locate the camshaft sensor electrical connector (yellow arrow).
Figure 12

Working beneath the intake manifold, locate the camshaft 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.

Feed the harness out of the engine with the sensor.
Figure 13

Feed the harness out of the engine with the sensor. To replace the sensor, route the wiring as it was before. Then install the sensor into the cylinder head and tighten the fasteners. Connect the electrical connector and install the remaining items. Clear all the fault codes from the DME when complete.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Mon 12/5/2016 02:47:11 AM