Ecu not detected
Thread Starter
Driver School Candidate
Joined: May 2018
Posts: 3
Likes: 0
From: tx
Ecu not detected
Hey guys i am working on a 2008 lexus is 250
the cranks for like 4 seconds and then it stops . when that happens the check engine light does not come on anymore and i have no connectivity on my scanner . if i let it sit again for a couple of hours it then does the same thing and i am able to crank again and conect to the ecu if i dont crank and just turn the acc switch on . does anyone have the pin out of what pins are for ground and power on ecu plugs ?
the cranks for like 4 seconds and then it stops . when that happens the check engine light does not come on anymore and i have no connectivity on my scanner . if i let it sit again for a couple of hours it then does the same thing and i am able to crank again and conect to the ecu if i dont crank and just turn the acc switch on . does anyone have the pin out of what pins are for ground and power on ecu plugs ?
Cant help you there but you can buy a 48hr subscription to the toyota TIS website for $15 and look it up yourself.
It's more likely that your CAN bus is dropping out for some reason. I would begin by unplugging the ECU/ECM harness and inspect the pins for damage, growth, water intrusion, burns etc.
If nothing is found, log on to TIS and look about. IIRC it has trouble shooting guides too.
It's more likely that your CAN bus is dropping out for some reason. I would begin by unplugging the ECU/ECM harness and inspect the pins for damage, growth, water intrusion, burns etc.
If nothing is found, log on to TIS and look about. IIRC it has trouble shooting guides too.
Driver School Candidate
Joined: Jun 2018
Posts: 3
Likes: 0
From: Gauteng
I picked up the exact same issue on my car. car was started and moved. swithced off for about an hour. went back started fine and reversed. weird rev, car switched off and had this issue of not starting.
Car is 2009 is250se (133k milage)
Things tested so far - Fuel low pressure and after high pressure pump. fuel pump seems to be working
Battery,
checked all fuses, ecu plugs, wiring
checked fuel pressure sensor (disconnected as well)
tested the hold acc pedel down while trying to start
tested with spare key.
crank position sensor tested. gets a reading which was under 200rpms on cranking if i recall
from what i can pickup
ECU is detectable on the obd scanner for 2 attempts. thereafter it goes offline for about an hour. car will crank for a few seconds but not run. while ECU can be scanned the car will crank.
this rules out starter it works every 2 times then needs to be left for an hour once the ecu isnt detactable. if the starter relay is bridge it will crank.
trying to get my hands on a running IS250 (06-07) to swop ECU's to test
please keep me posted if you find a solution.
Car is 2009 is250se (133k milage)
Things tested so far - Fuel low pressure and after high pressure pump. fuel pump seems to be working
Battery,
checked all fuses, ecu plugs, wiring
checked fuel pressure sensor (disconnected as well)
tested the hold acc pedel down while trying to start
tested with spare key.
crank position sensor tested. gets a reading which was under 200rpms on cranking if i recall
from what i can pickup
ECU is detectable on the obd scanner for 2 attempts. thereafter it goes offline for about an hour. car will crank for a few seconds but not run. while ECU can be scanned the car will crank.
this rules out starter it works every 2 times then needs to be left for an hour once the ecu isnt detactable. if the starter relay is bridge it will crank.
trying to get my hands on a running IS250 (06-07) to swop ECU's to test
please keep me posted if you find a solution.
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Driver School Candidate
Joined: Jun 2018
Posts: 3
Likes: 0
From: Gauteng
Update: had an auto electrician diagnose.
got him to disconnect fuel pressure sensor even thou mechanic said it was fine.
car started cranking all the time. 👍🏻
tried the foot flat on accelerator. And car came back to life. Seems like it was flooded badly while testing.
problem found. Ecu no longer disables after 2 attemps.
will search for a new sensor and update.
thanks to the forum for tips.
got him to disconnect fuel pressure sensor even thou mechanic said it was fine.
car started cranking all the time. 👍🏻
tried the foot flat on accelerator. And car came back to life. Seems like it was flooded badly while testing.
problem found. Ecu no longer disables after 2 attemps.
will search for a new sensor and update.
thanks to the forum for tips.
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Racer
Joined: Mar 2016
Posts: 1,583
Likes: 310
From: Plano Texas
Back in 2014 there was a recall issued for the fuel pressure sensor. Was that done to your car?
- - - - - - - - - - - - - - - - - - - - - - -
NHTSA Campaign Number: 14V647000
Manufacturer Toyota Motor Engineering & Manufacturing
Components FUEL SYSTEM, GASOLINE
Potential Number of Units Affected 422,509
Summary
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2007-2010 Lexus LS vehicles manufactured May 9, 2006, to July 20, 2010, 2006-2011 Lexus GS vehicles manufactured January 6, 2005, to September 10, 2010, and 2006-2011 Lexus IS vehicles manufactured August 30, 2005, to September 10, 2010. Due to anti-corrosion plating remnants, fuel may leak from where the fuel pressure sensor is attached to the fuel delivery pipe.
Remedy
Toyota will notify owners, and dealers will clean and reseal the fuel pressure sensor mounting area, free of charge. The recall began March 3, 2015. Owners may contact Toyota customer service at 1-800-331-4331.
- - - - - - - - - - - - - - - - - - - - - - -
You can go here and enter the VIN of your car to see what recalls are still waiting (i.e., have NOT been done) to be done to your car to your car.
https://vinrcl.safercar.gov/vin/
- - - - - - - - - - - - - - - - - - - - - - -
NHTSA Campaign Number: 14V647000
Manufacturer Toyota Motor Engineering & Manufacturing
Components FUEL SYSTEM, GASOLINE
Potential Number of Units Affected 422,509
Summary
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2007-2010 Lexus LS vehicles manufactured May 9, 2006, to July 20, 2010, 2006-2011 Lexus GS vehicles manufactured January 6, 2005, to September 10, 2010, and 2006-2011 Lexus IS vehicles manufactured August 30, 2005, to September 10, 2010. Due to anti-corrosion plating remnants, fuel may leak from where the fuel pressure sensor is attached to the fuel delivery pipe.
Remedy
Toyota will notify owners, and dealers will clean and reseal the fuel pressure sensor mounting area, free of charge. The recall began March 3, 2015. Owners may contact Toyota customer service at 1-800-331-4331.
- - - - - - - - - - - - - - - - - - - - - - -
You can go here and enter the VIN of your car to see what recalls are still waiting (i.e., have NOT been done) to be done to your car to your car.
https://vinrcl.safercar.gov/vin/
Driver School Candidate
Joined: Jun 2018
Posts: 3
Likes: 0
From: Gauteng
Thanks Dennis
to my knowledge that was done on my car. I will follow up with the dealer to check records.
the recall was only for the gasket not the sensor that seems to be faulty this time.
update. Car starts most times on first crank. Abit delayed compared to normal. But starts. Progress...
doesnt rev past 2000rpm
code throws u for vsc and fuel pressure sensor thats disconnected. I will try souce a sensor locally. Already ordered one online but shipping times are long to South Africa
to my knowledge that was done on my car. I will follow up with the dealer to check records.
the recall was only for the gasket not the sensor that seems to be faulty this time.
update. Car starts most times on first crank. Abit delayed compared to normal. But starts. Progress...
doesnt rev past 2000rpm
code throws u for vsc and fuel pressure sensor thats disconnected. I will try souce a sensor locally. Already ordered one online but shipping times are long to South Africa
Driver
Joined: Oct 2023
Posts: 86
Likes: 14
From: SC
I experienced a similar issue. After returning home from a road trip, my car sat for a couple of days. When I started it, the battery seemed weak, but it started without issue. I parked it outside the garage and forgot to close the convertible top. I attempted to close the top with the engine off, but it stopped midway. When I tried to restart the car, it cranked once, and then the battery died.
Jump-starting didn’t work, and the car wouldn’t even attempt to start. Every 2–3 hours, I tried starting it, and while it cranked, the engine wouldn’t fire. I also couldn’t read any error codes.
Eventually, I figured it out—when the cylinders are flooded, the fuel pressure sensor seems to send data to the PCM, shutting down the system. I unplugged the sensor connector and tried starting the car, and it fired right up! A check engine light appeared due to the disconnected sensor, but after plugging it back in, the car started flawlessly and felt like new. Problem solved! I hope, this can help you guys.
Jump-starting didn’t work, and the car wouldn’t even attempt to start. Every 2–3 hours, I tried starting it, and while it cranked, the engine wouldn’t fire. I also couldn’t read any error codes.
Eventually, I figured it out—when the cylinders are flooded, the fuel pressure sensor seems to send data to the PCM, shutting down the system. I unplugged the sensor connector and tried starting the car, and it fired right up! A check engine light appeared due to the disconnected sensor, but after plugging it back in, the car started flawlessly and felt like new. Problem solved! I hope, this can help you guys.
Driver
Joined: Oct 2023
Posts: 86
Likes: 14
From: SC
UPDATE:
Unfortunately, the problem persisted. I removed the air surge tank to inspect the fuel pressure sensor and found that the plastic part behind the sensor had melted. I’ve ordered the updated fuel pressure sensor 89458-30011, the gasket 90430-12026, and the air surge tank to intake manifold gasket 17176-31060.
I’m aware that the technical instructions recommend removing the intake manifold and adjusting the sensor’s torque angle, but since I don’t have the necessary tools, I won’t be doing that. I’m hoping that simply replacing the sensor resolves the issue. I’ll provide an update once the replacement is done!
Unfortunately, the problem persisted. I removed the air surge tank to inspect the fuel pressure sensor and found that the plastic part behind the sensor had melted. I’ve ordered the updated fuel pressure sensor 89458-30011, the gasket 90430-12026, and the air surge tank to intake manifold gasket 17176-31060.
I’m aware that the technical instructions recommend removing the intake manifold and adjusting the sensor’s torque angle, but since I don’t have the necessary tools, I won’t be doing that. I’m hoping that simply replacing the sensor resolves the issue. I’ll provide an update once the replacement is done!
UPDATE:
Unfortunately, the problem persisted. I removed the air surge tank to inspect the fuel pressure sensor and found that the plastic part behind the sensor had melted. I’ve ordered the updated fuel pressure sensor 89458-30011, the gasket 90430-12026, and the air surge tank to intake manifold gasket 17176-31060.
I’m aware that the technical instructions recommend removing the intake manifold and adjusting the sensor’s torque angle, but since I don’t have the necessary tools, I won’t be doing that. I’m hoping that simply replacing the sensor resolves the issue. I’ll provide an update once the replacement is done!
Unfortunately, the problem persisted. I removed the air surge tank to inspect the fuel pressure sensor and found that the plastic part behind the sensor had melted. I’ve ordered the updated fuel pressure sensor 89458-30011, the gasket 90430-12026, and the air surge tank to intake manifold gasket 17176-31060.
I’m aware that the technical instructions recommend removing the intake manifold and adjusting the sensor’s torque angle, but since I don’t have the necessary tools, I won’t be doing that. I’m hoping that simply replacing the sensor resolves the issue. I’ll provide an update once the replacement is done!
GL
Driver
Joined: Oct 2023
Posts: 86
Likes: 14
From: SC