Reply With QuoteIn a jag I owned for awhile the simple test for a faulty CPS was that if while cranking the tacho was bouncing off the zero stop and showing 100-200 rpm then it wasn't the CPS that was the prob, but if tachometer was dead then suspect CPS.
Cheers
Master
Subscriber
Crank Position Sensor
It seems that we may also have a faulty Crankshaft Position Sensor as indicated in the thread by Phil Wynter. http://www.aulro.com/afvb/discovery-...t-restart.html
Does someone know what is the correct resistance value of a new or working Crankshaft Position Sensor? The resistance of our sensor is 0.68 ohm.
When cold or turned off for more than 5 minutes our 1999 Discovery 2 V8 manual spins over with the starter motor but does not fire.
When testing with the spark plug tester and trying to start the engine there is no spark from either banks of the engine. There also is no fault codes related to the sensor and the check engine light extinguishes when cranking.
The workshop manual says when fitting a new Crankshaft Position Sensor or removing the fly wheel the adaptive values will have to be reset using Testbook. Can you replace or remove the sensor without reseting the adaptive values as we do not have access to a Testbook?
LRT.
Master
In a jag I owned for awhile the simple test for a faulty CPS was that if while cranking the tacho was bouncing off the zero stop and showing 100-200 rpm then it wasn't the CPS that was the prob, but if tachometer was dead then suspect CPS.
Cheers
Master
SubscriberHi Alpick, thanks for the tip.
The tacho doesn't shift, but the live data on the diagnostic tool goes up to 200rpm!
Can the CPS be removed and replaced without resetting values?
LRT
Major part of the heart and soul of AULRO.comThat depends on how the tacho is driven. Some are driven from the tacho output on the alternator.Originally Posted by alpick
Ron B.
VK2OTC
2003 L322 Range Rover Vogue 4.4 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA
RIP Bucko - Riding on Forever
If you get no reply's send Lewy a PM, I know he had his CPS fail on the way back to Darwin, so he may be able to shed some light on your problem.
Cheers Ean
Swaggie
To ensure it is the crank sensor, see if you have fuel pump operation during cranking. If not, then fuel pump operation combined with no spark and injector pulse usually adds up to a crank sensor failure with the Thor Motronic engine.
PS, Adaptive values don't ALWAYS need to be reset in my experience, just drive it and see. they are just there to take up wear and tear in the engine over time and how hard it gets driven etc etc.
Sometimes it may even run better than if you HAVE reset them.....
JC
Master
SubscriberHi justinc, the fuel pump works and the injectors pulse in the live data on the diagnostic tool, so it does seem that it may be the crank position sensor. Thanks so much for the differential diagnosis and your comments about the adaptive values - much appreciated and a relief.
LRT
Swaggie
Actually I didn't explain myself well, if the fuel pump IS NOT being triggered then it is most likely a crank sensor. You find that the whole system drops out IE fuel pump signal, injector pulse and spark because the computer doesn't 'see' the engine rotating.
At least that has been my recent experience with a D2. I actually initially thought the crash switch had been triggered but bypassing it made no difference. That is when I went through the system and discovered NOTHING was working during cranking, fitted a known working crank sensor and voila.
JC
Master
SubscriberMany thanks justinc for the clarification. It seems as though we may have a more complex problem to diagnose and solve.
LRT
Wizard
Mine was exactly as justin discribed above,is your key fob alarm etc working as usual
Posting Permissions
| Search AULRO.com ONLY! |
Search All the Web! |
|---|
|
|
|
Bookmarks