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After replacing timing belt one cylinder stops working/error codes P1336 and P1337

Tiny
JONNYB1963
  • MECHANIC
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Yes, I did see the interference on the scope trace. By the way, I have a Rigol scope too, 50 mhz 2 channel. Love it! Saving up for a nice 1Ghz Mixed Domain (I do a lot of EMC work). I would attribute the interference to just having inserted a nice Dipole antenna in the circuit! Nothing to worry about there. And yes you would expect the frequency to change with engine RPM so all looked good there.

Are you considering replacing the chip yourself on the MCU? I cannot find a datasheet on the 30566 to look at much less the schematics of the ECU but you are a brave soul. I am not a fan of working on SMD's my eyes are not so good anymore. Give me through hole PCB's any day ;) Yes I grew up with vacuum tubes as well.

Is the cost of the new ECU prohibitive? Or are you just a hardcore "I am going to fix this" sort of person like me?
Jon
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Tuesday, November 13th, 2018 AT 8:46 AM
Tiny
JONNYB1963
  • MECHANIC
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Sorry I missed something. You reported that you are seeing 12 volts on both of the terminals on one of the Injector connectors with the key on engine off?
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Tuesday, November 13th, 2018 AT 8:47 AM
Tiny
SANNKYNM
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No no. If you go through my all my post, you would see that after 2,500 rpm's, one of the injectors stops, and why it stops is because both terminal of the injector ( one that stops) gets 12 volts.

By the way, I am 24 old Electronics engineer, I work with ROVs ( underwater robots). I guess we both share the same passion.
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Tuesday, November 13th, 2018 AT 8:50 AM
Tiny
SANNKYNM
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By the way. I live in Chile, we do not get anything here. We have to import everything from other countries. Buying an ECU is very expensive for me. I would just fix this issue anyhow. I will not give up.
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Tuesday, November 13th, 2018 AT 8:51 AM
Tiny
JONNYB1963
  • MECHANIC
  • 252 POSTS
Awesome! 55 Year old, Mechanical/Electrical Engineer here. Been making smoke and solder since I was 10! I understand the problem with the ECU purchase. I cannot really advise you on the chip swap though. If you are that industrious and have all the equipment and skills I would say have at it. I am not at all familiar with the chip specs or the ECU internals. Sorry!
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Tuesday, November 13th, 2018 AT 9:27 AM
Tiny
SANNKYNM
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Awesome. Nice to meet you (virtually).
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Tuesday, November 13th, 2018 AT 10:00 AM
Tiny
SANNKYNM
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Guys, my ECU is broken. What shall I do?
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Tuesday, November 20th, 2018 AT 4:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I would try to find a used one, if not you will need to get it programmed should cost about $130.00 to get it done.
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Friday, November 23rd, 2018 AT 11:06 AM
Tiny
SANNKYNM
  • MEMBER
  • 21 POSTS
Hi Ken,

Someone is selling me a used ECU ( unblocked), shall I go for it?

There is another one who is selling, ECU, BSI and the keys as well or shall I go for this one?

Regards.
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Friday, November 23rd, 2018 AT 11:13 AM
Tiny
KEN L
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Go for the one with the keys so you will not need any programming. Let us know what happens and please upload pictures or videos of the problem.
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Friday, November 23rd, 2018 AT 12:23 PM
Tiny
SANNKYNM
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I fixed the problem. As all of you guys know Peugeot can be a real pain in arse.
So finally, we revised almost everything in the car. After going through so much, I just made a simple test. I took off the accessory belt and tested the car. Guess what, the problem went away, So I thought, maybe the alternator is messing up and so I installed the accessory belt back and disconnected the alternator wiring, the issue came back, after 2500 rpms, I lost one of the cylinders, then I thought it might be the compressor for the air conditioner so I disconnected that as well, now I have disconnected the alternator and air compressor and still I have the issue where after 2500 rpms, I lose one of the cylinders. So finally I took off the accessory belt and guess what? Again the car started functioning alright. Finally, I concluded that as I install the accessory belt irrespective of if the alternator and air compressor is connected or not, I get the issue where I loose the cylinder after 2500 rpms. Then I revised the belt itself and it was stretched a bit and my tensor was bit inside causing the half of belt to run on it, so I changed the belt and the tensor; my car is working A-ok.

The real question, How the hell a stretched accessory belt and a bad tensor can cause a car to loose its cylinder after 2500 rpms, Can anyone explain, please?
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Thursday, March 14th, 2019 AT 8:01 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey SANNKYNM,

P1336 and P1337 are codes for the crankshaft position sensor. Are these the only codes you had? No misfire codes?

The only explanation I can think of initially is that the engine isn't actually misfiring or losing a cylinder. Noise or juddering due to the worn belt slipping or being loose enough to hit other engine components, or the tensioner chattering under load could cause the appearance of a misfire.

The accessory belt running out of line enough to interfere with the crankshaft sensor pickup is potentially possible but I think unlikely. That could cause an engine running issue. What year/engine is your peugeot?

Regards, Joe
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Saturday, March 16th, 2019 AT 2:24 PM
Tiny
JOETECHPRO
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Hey SANNKYNM,

Another thought would be to check to make sure the belt had not been contacting any wiring harness that runs near the belt. If the belt had deflected enough to rub through a the harness for the crankshaft position sensor this could also be the cause of your issue. Worth checking to make sure you don't have damaged wiring that will cause you problems further down the line.

Regards, Joe
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Saturday, March 16th, 2019 AT 2:33 PM
Tiny
SANNKYNM
  • MEMBER
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Hi Joe,

Thank you so much for your response, I appreciate it and honestly whatever you are saying make sense. My car is a Peugeot 307 1.6 16v 2007 model D-sign break. Its a gasolin car. Hmm in my car the crank shaft sensor is located quite far away from the accessory belt. I dont think it can possibly bother the crankshaft sensor function and I dont see any wiring harness close to the accessory belt. My car runs a-ok now, after 1.5 years I was able to run my car like a normal car. Its a pity because just because of loose accessory belt I spent 1, 5 year looking for the problem and almost 1000 usd in replacing parts that had to nothing with the issue. I live in Chile. A good mechanic is like a unicorn.

Regards.
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Saturday, March 16th, 2019 AT 4:30 PM
Tiny
SANNKYNM
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By the way the codes that had had before I resolved it were p1336 p1337 p1338 and p 1339 and I think it was p1340 as well.

Surely I will keep continuing what caused this problem at the first place.
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Saturday, March 16th, 2019 AT 4:33 PM
Tiny
JOETECHPRO
  • MECHANIC
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Hey SANNKYNM,

Sorry I missed the previous posts with the check and finding injector shutting down. Unless in replacing the belt you disturbed wiring/ground connection for the crankshaft position sensor/PCM/injector I really can't see why replacing it would fix the fault. With only one injector affected its an interesting fault to have. Very glad to hear it is now running well! Hopefully you will eventually get an answer, cars can throw out some mysteries some times.

Regards, Joe
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Saturday, March 16th, 2019 AT 6:50 PM
Tiny
SANNKYNM
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Yes I am glad as well. Thank you so much for giving some thoughts on this mysterious issue.

Regards.
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Sunday, March 17th, 2019 AT 5:35 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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JOETECHPRO is one of our newest experts and is quickly shaping up to be one of our best :) Please let us know what you find. We are interested to see what it is.
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Sunday, March 17th, 2019 AT 3:17 PM
Tiny
SANNKYNM
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Sure ; I will Ken, you guys have been amazing. Thank you so much for the support.
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Sunday, March 17th, 2019 AT 8:05 PM

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