Drakes Posted December 26, 2007 Share Posted December 26, 2007 Can anybody tell me if when you press the clutch pedal down if this switch completes the circuit or breaks the circuit Thanks Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 26, 2007 Share Posted December 26, 2007 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 Quote Link to comment Share on other sites More sharing options...
Porny Posted December 26, 2007 Share Posted December 26, 2007 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 Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 26, 2007 Share Posted December 26, 2007 In other words when foot is removed from accelerator the engine will respond this week not next Quote Link to comment Share on other sites More sharing options...
Drakes Posted December 27, 2007 Author Share Posted December 27, 2007 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? Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 27, 2007 Share Posted December 27, 2007 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. Quote Link to comment Share on other sites More sharing options...
jj_110 Posted December 27, 2007 Share Posted December 27, 2007 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 Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted December 28, 2007 Share Posted December 28, 2007 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! Quote Link to comment Share on other sites More sharing options...
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