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Clutch Switch Testing and Replacement
 
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Pelican Technical Article:

Clutch Switch Testing and Replacement

Nick Czerula

Time:

1.5 hours

Tab:

$50

Talent:

****

Tools:

Phillips & 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:

Clutch pedal switch

Hot Tip:

Use a high impedance DVOM

Performance Gain:

Repair faulty clutch switch

Complementary Modification:

Replace brake light switch

Volvo V70 models are equipped with an electronic clutch switch, which is mounted to the clutch pedal. This switch sends an open or closed signal to the DME depending on clutch pedal position. When the clutch is pressed the switch closes. When the clutch switch is not pressed, the switch is open. The clutch switch is used to notify the DME that you pressed the clutch pedal. The signal generated by the clutch pedal switch is used for engine starting, engine performance and traction / ABS control.

The clutch pedal switch is mounted below the clutch master cylinder. It clips onto small ball mounts, secured via plastic sockets. Replacing it is quite easy, and I will show you a little later in this tech article how to test it for faults.

Remember that your car may have been serviced before and had parts 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. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. 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.

Remove the lower dashboard trim near the pedal assembly. See our tech article on lower dashboard trim removing.

Working at the lower trim panel above the pedal cluster, remove the T25 Torx screw (red arrow).
Figure 1

Working at the lower trim panel above the pedal cluster, remove the T25 Torx screw (red arrow).

Pull the panel forward about two inches, then down.
Figure 2

Pull the panel forward about two inches, then down. During this step you are detaching the panel clips (red arrows) from the instrument panel.

Lower the trim panel enough to access the footwell light electrical connector.
Figure 3

Lower the trim panel enough to access the footwell light electrical connector. Disconnect the electrical connector by releasing the clip and pulling it straight out.

Pull the panel down to detach the air duct (red arrow) while feeding the hood release lever through the slot (green arrow).
Figure 4

Pull the panel down to detach the air duct (red arrow) while feeding the hood release lever through the slot (green arrow).

Now that you have removed the trim panel, you will have to disconnect the clutch switch electrical connector.
Figure 5

Now that you have removed the trim panel, you will have to disconnect the clutch switch electrical connector. It is located on the bottom (red arrow). Press the release tab (yellow arrow) and pull the connector straight out of the switch.

To remove the clutch switch from the clutch master cylinder, pull the top (red arrow) down.
Figure 6

To remove the clutch switch from the clutch master cylinder, pull the top (red arrow) down. Then pull the switch away from the bulkhead in the direction of the green arrow.

This photo shows detaching the top.
Figure 7

This photo shows detaching the top.

This photo shows pulling the switch away from the bulkhead.
Figure 8

This photo shows pulling the switch away from the bulkhead. To install the new switch, connect the bulkhead socket first. Then snap the top socket on the clutch pedal. Once installed, connect the electrical connector and reassemble the trim panel. Check that the clutch switch is functioning properly by starting your vehicle and you are done.

The switch has two wires going to it: a ground and a 5 volt feed.
Figure 9

The switch has two wires going to it: a ground and a 5 volt feed. Yu can test with the switch installed or removed. I will show you how to test the switch with it removed. The only difference would be using the clutch pedal to activate the switch, instead of doing it by hand. To test, you need to confirm the ground and the 5 volt feed are both present and that the signal occurs when the clutch pedal is pressed. Confirm the wiring for your vehicle with a current wiring diagram. All testing has to be done with the key in the ON position. Connect your DVOM to the signal wire (yellow arrow). With the clutch pedal up or the switch not pressed (green arrow), it should read about 5 volts (red arrow).

With the clutch pedal pressed or the switch compressed by hand, it should read about 2.
Figure 10

With the clutch pedal pressed or the switch compressed by hand, it should read about 2.5 volts (red arrow).

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Comments and Suggestions:
Eliza Cranston Comments: Thank you for explaining how to test the clutch switch in a Volvo. I think that there is something wrong with my clutch and I'd like to check it out. I'll follow these steps!
December 8, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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