AE111 can crank but engine start

[Lawcc]

Starter can crank but engine won't start

My manual corolla seg stock engine keep giving me this problem. Today is the third time. I am really hopeless now.

First time (2 weeks ago) it happened, just call mechanic, he just open and close the fuel outlet near firewall, then it was ok.

I suspect it could be due to alarm issue, then go and install a new alarm. On that night, the same problem happened again. The installer just use additional wire to connect the fuel wire to a connector to bypass, then it was ok.

This morning, the same issue happens again. After dinner, come back try luck to start, it was ok.

Below is the history
1. the car overheated 1~2 years ago.
2. change radiator
3. earlier engine die off while driving on the road, change distributor, its wiring, spark plugs and plug cables.
4. fuel pump changed
5. recently change engine gasket, timing belt, water pump etc...

What could be the reason? Please help.

Thanks a lot.

 

[me2kimi]

how about distributor? have you check it?

 

[levin818]

Sounds like ECU starts to give way.
But its better to run diagnostic to scan for any fault code.

 

[Lawcc]

how about distributor? have you check it?

Unlikely as the new distributor has been replaced.

---------- Post added at 12:20 AM ---------- 6 hour anti-bump limit - Previous post was at 12:17 AM ----------

Sounds like ECU starts to give way.
But its better to run diagnostic to scan for any fault code.

I have a good ecu and did test on it but still doesn't help.

---------- Post added at 12:21 AM ---------- 6 hour anti-bump limit - Previous post was at 12:20 AM ----------

Today cannot start again.

---------- Post added at 12:23 AM ---------- 6 hour anti-bump limit - Previous post was at 12:21 AM ----------

It looks like there's a fuel cut due to some unknown reason.

 

[leonl]

1. Check Sparks & fuel first (clogged fuel filter?).
2. Then engine sensors (CPS?).
3. Cylinders Compression (less likely, should start but runs crappy).
4. ECU (Less likely).
5. Get engine error code.

Good luck.

 

[Lawcc]

1. Check Sparks & fuel first (clogged fuel filter?).
2. Then engine sensors (CPS?).
3. Cylinders Compression (less likely, should start but runs crappy).
4. ECU (Less likely).
5. Get engine error code.

Good luck.

1. Fuel filter unlikely as it was not performance issue, but the engine cannot start at all.
2. CPS? Not sure, I ask mechanic to check but he say no crank sensor for this model.

 

[levin818]

Any fault code?

 

[KenDiriwan]

Your engine died off is it on low-speed / idling ?

 

[leonl]

1. Fuel filter unlikely as it was not performance issue, but the engine cannot start at all.
2. CPS? Not sure, I ask mechanic to check but he say no crank sensor for this model.

Since you have mentioned engine turn over but will not start. Even witha good fuel pump & clogged fuel filter. Engine still not getting fuel. I just changed fuel pump on my ML55 and many others change their filter at the same time since sometimes it got clogged. Just a thought.

My car will crank but will not start and commonly on ML, it is CPS and changed that, still no start. Checked fuel pressure and it was "weak". Traced it back to fuel pump and bingo. Replaced the fuel pump and now running as normal.

Check fuel and spark first, unless engine check light is on, then get the code first just like the rest has mentioned.

Good luck and keep us update.

 

[Lawcc]

My mechanic pull extra wiring from fuel pump to fuse box and few days gone the issue seems resolved.
He suspected it was due to the previous cobra alarm which caused the fuel to cut off. The previous tenon alarm installer didn't uninstall my problematic cobra alarm before installing.

 

[leonl]

My mechanic pull extra wiring from fuel pump to fuse box and few days gone the issue seems resolved.
He suspected it was due to the previous cobra alarm which caused the fuel to cut off. The previous tenon alarm installer didn't uninstall my problematic cobra alarm before installing.

Great to know that. So the alarm disabled the fuel pump, no fuel to engine, so no start. It is always good to have a problem solved.

 

[Lawcc]

The same issue come back again after 2 months of driving. It come randomly, and when it comes, after left it over night, it is ok again. I really wonder what is wrong.

 

[mh wong]

change mechanic la bro,

chun power, in shah alam, h/p#019-383 5675
ah nga, kajang bandar technology, h/p#019-217 4320, 012-704 8869

 

[ahaw]

wiring con. check, afraid some circuit shorted...

 

[me2kimi]

Happend to me 2 days ago. Drived to office and stop to buy nasik lemak. Then engine can crank but cant start. After Trobleshoot everything, I found that fuel pump wire short.

It short at 'sambungan' BLUE wire after changed halfcut engine. The wire became hot and short to body at the sambungan place. Manage to solved this problem after solder the sambungan. No more heat.



Sent from my Galaxy Nexus

 

[Lawcc]

Thanks for the info. You DIY?

 

[me2kimi]

Yes, DIY it bro.
One more thing, have you check Circuit Open Relay? This relay is the controller for the fuel pump. Usually this relay locate underneath dashbord.

Sent from my Galaxy Nexus

 

[Lawcc]

Yes, DIY it bro.
One more thing, have you check Circuit Open Relay? This relay is the controller for the fuel pump. Usually this relay locate underneath dashbord.

Sent from my Galaxy Nexus

Thanks for highlighting....
Will the relay cause intermittent issue?

 

[me2kimi]

Thanks for highlighting....
Will the relay cause intermittent issue?

I'm not sure. Maybe yes or maybe no. But you can try swap it first.


Here is how the Circuit Opening Relay operate:


Circuit Opening Relay Function
The function of the COR is to switch power to the fuel pump when the engine is running or being started. Having power to the fuel pump only when the engine is being started or is running is a safety feature.

An example of an event in which the COR would disconnect power to the fuel pump would be an accident, where
The driver is unconscious (and hence the ignition has been left on)
The engine has stalled
The fuel line has been ruptured

In this scenario the COR will be controlled to turn the fuel pump off (as the engine is not running) and this will stop fuel from leaking at high pressure from the ruptured fuel line. This is a desirable (and legally required) safety feature that would not exist if the fuel pump was wired to come on directly with the ignition.

Circuit Opening Relay Operation
The COR is much like a normal relay, however it has two 'triggers', either of which can be used to turn the COR on and switch power to the fuel pump.

Circuit Opening Relay Trigger 1
In all cases one of the triggers to turn the COR relay on is the ignition key being in the START position, this ensures that the fuel pump runs when attempting to start the engine is

Circuit Opening Relay Trigger 2 - Flap Type Air Flow Meter Equipped Engines
In cars with a flap type Air Flow Meter (AFM) there is switch inside the AFM that is open when the engine is stopped, when the engine is running the movement of the AFM flap causes this switch to close and trigger the COR on.

When the engine is not running the AFM switch is open and the COR is off causing the fuel pump to be turned off.

Circuit Opening Relay Trigger 2 - MAP Sensor & Non Flap Type Air Flow Meter Equipped Engines
In cars without flap type AFMs the engine ECU detects the engine speed (via the distributor or crank angle sensor etc) and the engine ECU has a dedicated output pin FC that is connected to ground inside the engine ECU via a transistor to turn the COR on when the engine ECU determines that the engine is running.

When the engine ECU determines that the engine is not running the engine ECU FC output is turned off which causes the COR to turn off and the fuel pump to be turned off.

Summary:
-fuel pump will operate when it detect engine speed
-it also act as safety relay

 

[Lawcc]

WOW...so informative. Thanks a lot.

Do you roughly how much is a COR?