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Camshaft Position Sensor Testing
 
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Pelican Technical Article:

Camshaft Position Sensor Testing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$50

Talent:

*****

Tools:

DVOM, backprobes, 10mm socket

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

Hot Tip:

Always note and double-check your test results

Performance Gain:

Remedy fault codes

Complementary Modification:

Replace camshaft sensor

The digital motor electronics (DME) engine management system in Volvo V70 vehicles utilize 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 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.

In this tech article we will go about testing Volvo V70 camshaft position sensors on base V70 models. Other engines are similar, and the same test techniques can be applied. A faulty camshaft sensor will set a fault code and possibly create engine drivability problems such as rough idle, engine stalling and misfire.

During the tests you will see what a working sensor will show. If your readings do not match, replace the 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 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. All testing will be performed with the key on and the engine off.

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).

Working at the throttle housing, remove the four 10mm fasteners (green arrows).
Figure 6

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 7

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

Working beneath the intake manifold, locate the camshaft sensor electrical connector (yellow arrow).
Figure 8

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. You will be backprobing the connector, from the intake manifold side.

Insert a backprobe into terminal 1 (yellow arrow), the end terminal.
Figure 9

Insert a backprobe into terminal 1 (yellow arrow), the end terminal. On my vehicle, it was the red wire. Then connect the red lead of your DVOM to the backprobe (green arrow).

With your DVOM connected, test the voltage at each terminal (red arrow).
Figure 10

With your DVOM connected, test the voltage at each terminal (red arrow). Terminal 1 is the sensor supply voltage and should be about 5 volts. Terminal 2 is the sensor reference voltage / signal wire. Terminal 3 is the ground for the sensor provided by the DME. The wiring color and DME terminal locations may vary. Check your model against a wiring diagram. Turn the Key ON, but do not start the engine. Connect your DVOM black lead to battery negative. Place the DVOM on D/C volts. The red lead will be used to probe the electrical connector. Pin 1: 5 volts. Pin 2 5 or 0 volts (depending on sensor shutter position), Pin 3 Ground, around zero volts.

Steer the wheels all the way right.
Figure 11

Steer the wheels all the way right. Then working in the wheel well, remove the 10mm plastic nut (red arrow).

Open the plastic access cover (red arrow) to gain access to the crankshaft pulley (green arrow).
Figure 12

Open the plastic access cover (red arrow) to gain access to the crankshaft pulley (green arrow).

Insert a backprobe into terminal 2, the middle terminal.
Figure 13

Insert a backprobe into terminal 2, the middle terminal. Then connect the red lead of your DVOM to the backprobe and the ground to battery negative. Rotate the engine clockwise by hand using a 30mm socket and ratchet on the crankshaft pulley bolt (red arrow). Monitor the DVOM for voltage to fluctuate from 5 volts to zero volts as the engine rotates. If voltage stays at 5 volts or 0 volts while you rotate the engine, and does not fluctuate, the sensor is faulty. The sensor voltage should cycle twice per engine revolution, (0 - 5 volts, then 0 - 5 volts again, per full engine rotation).

If you want to test the sensor removed from the engine, you can remove it and test it manually.
Figure 14

If you want to test the sensor removed from the engine, you can remove it and test it manually. 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 15

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

Pull the camshaft sensor out of the cylinder head.
Figure 16

Pull the camshaft sensor out of the cylinder head.

Connect your DVOM black lead to battery negative and place the DVOM on D/C volts.
Figure 17

Connect your DVOM black lead to battery negative and place the DVOM on D/C volts. The red lead will be used to probe the electrical connector. Connect the camshaft position sensor electrical connector. Insert a backprobe into terminal 2, the middle terminal. Then connect the red lead of your DVOM to the backprobe. Hold the sensor while moving a wrench across the tip. Monitor the DVOM. The voltage should fluctuate just as it should when rotating the engine by hand. In this photo the wrench (red arrow) is away from the sensor (green arrow), so the DVOM reads 0 volts.

In this photo the wrench (red arrow) is close to the sensor (green arrow), so the DVOM reads 5 volts.
Figure 18

In this photo the wrench (red arrow) is close to the sensor (green arrow), so the DVOM reads 5 volts. When done testing, be sure to clear the fault codes.











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Comments and Suggestions:
johnande Comments: how do you change the intergrated Cam sensor Mind doesn't seem to be the type that is external
May 26, 2016
  Followup from the Pelican Staff: What vehicle are you working on? Can you share a photo? - Nick at Pelican Parts  
johnande Comments: so how do you change the intergarated sensor
May 26, 2016
  Followup from the Pelican Staff: What vehicle are you working on? Can you share a photo? - Nick at Pelican Parts  

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