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TD5 Defender Clutch Switch

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Can anybody tell me if when you press the clutch pedal down if this switch completes the circuit or breaks the circuit

Thanks

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I think it must break a normally-closed circuit because if you disconnect the switch it disables the ASC which makes the vehicle either jerky or responsive, depending on your point of view :)

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From the workshop manual:

SWITCH - CLUTCH PEDAL

The clutch pedal switch is located on the clutch master cylinder and is activated when the clutch pedal is operated.

The ECM uses the signal from the clutch pedal switch to provide surge damping during gear change.

Surge damping stops engine speed rising dramatically (engine flaring) during gear change.

Surge damping assists driveability as follows:

• Smoother gear change.

• Greater exhaust gas emission control.

• Improved fuel consumption.

Input / Output When the clutch pedal is in the rest position, the clutch switch is closed. This allows a feed to flow from the switch (C0667-1) to the ECM (C0658-35) on a black/white wire. When the clutch pedal is pressed the switch contacts open, cutting the feed to the ECM.

The clutch pedal switch can fail in any one of the following ways:

• Switch open circuit.

• Short circuit to vehicle supply.

• Short circuit to vehicle earth.

In the event of a clutch pedal switch failure surge damping will be inactive.

Ian

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In other words when foot is removed from accelerator the engine will respond this week not next :D

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Porny and BogMonster

Thanks for your replies.I am converting to auto and so will no longer have clutch pedal but I am thinking that I will need to keep the feed down the black and white wire otherwise the ECM will try to operate surge damping all the time.

What do you think?

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No I think if you remove the connection (i.e. do away with the switch) the surge damping will be deactivated. There is a proper "auto" setting in the Td5 ECU though, from what I remember.

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No I think if you remove the connection (i.e. do away with the switch) the surge damping will be deactivated. There is a proper "auto" setting in the Td5 ECU though, from what I remember.

people claim that the car gets more responsive and dosnt loose as much boost on gearchanges if the plug is unplugged.

i drove many miles with it pluged in and also many with it disconnected and i can tell u that u notice absolutely naff all difference

no fault codes come up btw

JJ

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Guest diesel_jim
people claim that the car gets more responsive and dosnt loose as much boost on gearchanges if the plug is unplugged.

i drove many miles with it pluged in and also many with it disconnected and i can tell u that u notice absolutely naff all difference

no fault codes come up btw

JJ

i unplugged the switch on my old 110 and it drove like a "normal" rover.... in such as i had lots of transmission clunk again, so you need to gently release the clutch up again!

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