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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Ignition retarded - Knock sensor?Views : 4992 Replies : 13Users Viewing This Thread : |
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Mar 23rd, 2004, 00:34 | #11 |
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Last Online: Apr 10th, 2014 00:01
Join Date: Feb 2002
Location: Tonyrefail
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RE: Ignition retarded - Knock sensor?
When the clip is released the plug should lift up at one end and then be disengaged from a clip at the opposite end to the cable entry. This is similar to the ABS Control Unit and the ECU plug. Remember that the ECU AND ICU are interconnected. I think the knock sensor works via the ECU to alter the ICU. As I said before the sensor will have no effect whatsoever and cannot send a retard signal to the ECU/ICU either, if it is duff. All the best, Peter |
Jan 22nd, 2021, 17:04 | #12 |
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Last Online: May 11th, 2022 20:46
Join Date: Mar 2010
Location: worcester
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Can anyone help me please. My 98 945 turbo had been having intermittent issues. It would randomly cut out, after a few times of turning the engine off and on again it would cough splutter then be OK. It would then be weeks /months before it would do it again. Then sometimes when I put my foot down hard(with the boost turned up) it would start to miss fire, then it would be fine for weeks at a time also. So finally in November it died. After some research online I changed the icu for 1 I had in my shed from a car that got written off n I gutted it. It started up fine. Tested it and ran fine till I put my foot down n it is still missing under load. So I take the mbc off, put it back to LPT, no change. Swop the maf, no change. Put a new crank sensor on cos the outer cable was splitting, no change, new fuel pressure reg, no change. Then on a test had a huge backfire n lambda light came on. Put a new lambda in n no change and lambda light came back on after I cleared it. So I borrowed a mate's genuine volvo fault reader. It read faulty knock sensor, fitted a new 1 still no change! More research, tested the wires 12 & 13 to the icu, they are fine, got 0.75v to the fcu on pin 28, but I'm only getting 0.05v at the knock sensor between 1 wire n the battery negative, 0v on other wire n 0v across both plug wires not the 1.5-5v I should. I've swopped the fcu and got no difference in voltage also. Is my replacement icu no good or can anybody recommend anything else to try?????
Last edited by pony1975; Jan 22nd, 2021 at 17:24. |
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Jan 22nd, 2021, 17:39 | #13 | |
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Quote:
Also what fuel are you running on?
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ Last edited by Laird Scooby; Jan 22nd, 2021 at 17:42. |
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Jan 22nd, 2021, 17:42 | #14 | |
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Last Online: Yesterday 23:44
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Location: Lakenheath
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Quote:
Also reset all DTCs and then try again after checking/renewing the dizzy cap and rotor while you're at it. Then if there are any faults, read the DTCs and see what you've got.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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