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Tue Mar 14, 2017 1:10 am by vineethev

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 Coolant Temperature Alarm

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vineethev
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PostSubject: Coolant Temperature Alarm   Mon Jan 23, 2017 1:47 pm

Hi All

Mahindra Logan, 2008 November Model, 1.5 dCi, odo Reading 130000 km.

Recently I see coolant temperature alarm intermittently lighting up along with Engine knock (Serious knock with cracking kinda noise). To my surprise only four blocks in temperature level which is quite normal even before it alarms. Oil service was done 3 months back. Oil levels were perfect as per Company's instructions.

At this state, if I switch off and switch on ignition, alarm clears (while running & stand still) and I would be able to drive for a few more kilometers before it alarms again

While knocking if I continue to run, engine shuts off after a while. Engine restart is the only option.

Issue comes while running in city mostly, but faced it in long trips too.

Mechanic scanned the car and found two alarms logged in memory.
Rail pressure low & Rail pressure high. He cleared it and drove again, same alarms popped up.

My mechanic said it could be fuel line issue.
1. He removed Diesel tank, cleaned the strainer.
2. Replaced Diesel high pressure pump from another logan which runs good
3. Replaced Rail pressure sensor assembly (Delphi) from another logan which runs good

Heater plugs were just got replaced (Bosch brand) 3 months back

Still issue persists. Mechanic further told me that he will check Diesel Injectors.
Its still in garage.

Any lights in this issue?. Will be grateful for your advices.

Note: Added injector cleaner 350ml solution to full tank diesel once, not sure if that caused the issue.

Thanks
Vineeth
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mmehra
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PostSubject: Re: Coolant Temperature Alarm   Sun Feb 19, 2017 5:52 pm

Has the issue with your car been resolved?
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martin245
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PostSubject: Re: Coolant Temperature Alarm   Sun Feb 19, 2017 7:13 pm

That is what I hate people post and ask questions but we never get a Sitrep on what happened next
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vineethev
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PostSubject: Re: Coolant Temperature Alarm   Mon Feb 20, 2017 8:52 pm

Smile, my logan still in garage (almost 5 weeks). I see some progress.
They removed all 4 injectors, de-carbonized. 3 of them performed well at test bench but one got  damaged nozzle, in fact it partially does what it was supposed to.

New one cost 12000 INR, mechanic arranged a second hand one in good condition for 6000 INR, waiting for an update back from them. Must be hitting the road this Thursday hopefully.
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vineethev
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PostSubject: Re: Coolant Temperature Alarm   Fri Feb 24, 2017 3:22 pm

Update. Seems alarm+knock happens even after injector cleaning... troubleshooting electrical wiring now
Any lights, anyone please. I thought I would get suggestions at least from fellow members...
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mmehra
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PostSubject: Re: Coolant Temperature Alarm   Tue Feb 28, 2017 6:16 pm

When does knocking of engine start? After starting your engine when it is cold, how much time does it take for the knocking to start?
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vineethev
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PostSubject: Re: Coolant Temperature Alarm   Tue Feb 28, 2017 7:22 pm

Cold start never gives alarm and knock, to rule out I changed all 4 glow plugs 3 months back (Bosch brand). 
When Engine runs in city, especially in 2nd, 3rd gear / When engine heats up / log drive - gives temperature alarm followed by knock and finally engine shutdown. 
In fact alarm + knock frequency is more in city than highways during day times.
In opposite, it even gave alarm at night too.

Still troubleshooting going on at Garage, they suspect wiring fault.
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mmehra
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PostSubject: Re: Coolant Temperature Alarm   Wed Mar 01, 2017 1:18 pm

Your car is getting overheated. Fault with electrical can only be if cooling fan does not start.

When you first start your car which would be usually morning, if the engine runs fine, does not miss or knock and only knocks after getting heated which would be lets say after 15 to 40 minutes of engine running, then the fault lies in cooling system.

Do not run an overheated engine. Chances of damage to engine are there.

What is the level of coolant in reservoir bottle? When your car engine is heated, did you observe that your radiator cooling fan is working? Also the cooling fan has two speeds, a low and a high. In city driving the temperature starts to go above 100 degrees Celsius and if high RPM of fan does not happen then the temperature will keep rising.
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vineethev
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PostSubject: Re: Coolant Temperature Alarm   Tue Mar 14, 2017 1:10 am

Coolant levels are as per instructions. Fan just works as intended.
Got the car scanned from Mahindra, quoted 1.5 lakhs for Diesel high pressure pump & injectors replacement. Even If I go for it, they do not guarantee a solution (always says may get corrected etc)

Myself tested the diesel return flow from injectors, they just drips (2 drops a second ~) on all 4 injectors when there is no alarm. But when there is alarm, return flow is immense from all 4, I could here zzzz ____zzzz____ sound repeating the pattern every 2 seconds from engine while alarm. Also ~10V is being passed to injectors instead of 2V while alarm. I felt injectors & pump just works fine. It must be issue from wiring.

So again went back to my mechanic. Told him the facts. They now behind the Engine wiring.


Will update the results.
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