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toyota prado kdj120 diesel.

posted Jul 07, 2016 16:21:45 by CyrusKiur
No start!checkd crank sensor,cam sensor looks ok.no injections pulse at all and no check engine or no troube code.changed edu still no start.all computer ground looks fine.what does targetd common rail pressure?
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12 replies
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Dylan said Jul 07, 2016 16:49:01
What's your pressure while cranking? Do you have data PID on your scan tool?
Any particular reason why you've changed EDU?

Belgium, Europe
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CyrusKiur said Jul 07, 2016 18:28:24
I changed edu coz was no injections control wen cranking but no me the mechanic changes before i get there.fuel pressure while cranking is between 70 psi to 2100 psi,target pressure 4310 but target pressure changes as i crank.koef 0 psi.if fuel pressure is low,why fuel pressure is not seeing that?
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IvanKibuka-Kiguli said Jul 08, 2016 11:34:20
No start!checkd crank sensor,cam sensor looks ok.no injections pulse at all and no check engine or no troube code.changed edu still no start.all computer ground looks fine.what does targetd common rail pressure?


Did you say there is no check engine light or you meant the ECM communicates and CEL shows but throws no fault codes? If the EDU were faulty and the ECM OK, I believe the ECM would be the first to tell you about the faulty EDU.

Dylan is also very correct in asking you to look at the fuel rail pressure PID on the scan tool if the ECM is working. Infact that should be your first port of call on common rail diesels.
[Last edited Jul 08, 2016 11:36:52]
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CyrusKiur said Jul 08, 2016 13:49:56
Ok.I meant the pcm don't throw any trouble code.
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CyrusKiur said Jul 08, 2016 13:51:21
Which is the normal fuel pressure wen cranking?
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Dylan said Jul 08, 2016 19:56:54
Hey Cyrus. Here's some feedback. I know you do not have DTC but there's some interesting info.

http://www.moranbahweather.com/toyota/lc_trj12/rm/rm1151e/m_05_0422.pdf

Check voltage at rail pressure sensor. KOEO should be around 0.5 volts. While cranking voltage rises to +/- 1.2 volts.

Check out the pico waveform.



Belgium, Europe
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CyrusKiur said Jul 08, 2016 21:05:05
Thank u.
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CyrusKiur said Jul 10, 2016 08:40:33
I solved the problem!the problem was fuel pressure pumb but i dnt know y fuel pressure sensor didn't report this problem?
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Noah said Jul 10, 2016 13:45:59
..fuel pressure while cranking is between 70 psi to 2100 psi,target pressure 4310 but target pressure changes as i crank.koef 0 psi.if fuel pressure is low,why fuel pressure is not seeing that?

It looks like the pressure sensor was seeing it.
With a target pressure of 4,310 the actual pressure of 70-2,100 Is less than half that at best.
I'm happy to see you got to the bottom of it! Thank you for posting the fix to the problem, nice work!
Massachusetts, USA
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CyrusKiur said Jul 10, 2016 17:35:34
Thank u guy.if the sensor noticed y did pcm set code?
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Noah said Jul 11, 2016 01:37:16
That's a good question. If you have access to service information, you could check the code set criteria. I unfortunately have no information for that car in the US market. Maybe "noticed" is the wrong term.
The sensor was certainly reporting a low pressure condition, the computer however didn't respond with a trouble code.
Massachusetts, USA
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CyrusKiur said Jul 11, 2016 06:07:24
Ok thank u
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