When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hi guys hope you can help. My is250 (2008 auto) initially had a low rail pressure error and discovered the fuel pump was dead. After replacing pump which worked I now have another code C1201 and one that talks about throttle error. Cirrently when you accelerate the vehicle makes a whizzy sound, weak revs and the vsc and check engine lights are on. What could be the issue. The car is in limp mode as we speak
Description:
The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. When the monitored voltage (+BM) is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the engine switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
The ECM monitors the battery supply voltage applied to the throttle actuator. When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC. If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.
--
Check your ETCS fuse and any connectors that were touched during previous repairs to ensure nothing was cut, nicked, or damaged and that everything is connected properly.
My fuse box doesn't correspond with the cover. Have tried to go in the internet for fuse lay out with no luck... See attached my fuse box
Originally Posted by Jeff Lange
P2118: Open in ETCS power source (+BM) circuit
Trouble Area:
Open in ETCS power source circuit
ETCS fuse
ECM
Description:
The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. When the monitored voltage (+BM) is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the engine switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
The ECM monitors the battery supply voltage applied to the throttle actuator. When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC. If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.
--
Check your ETCS fuse and any connectors that were touched during previous repairs to ensure nothing was cut, nicked, or damaged and that everything is connected properly.
All of a sudden, when I pressed the accelerator pedal nothing happened. It stayed at about 1500 rpm. I had this error code P2118 and changing this fuse worked for me to fix it.
Description:
The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. When the monitored voltage (+BM) is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the engine switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
The ECM monitors the battery supply voltage applied to the throttle actuator. When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC. If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.
--
Check your ETCS fuse and any connectors that were touched during previous repairs to ensure nothing was cut, nicked, or damaged and that everything is connected properly.
Jeff
Hello Mr. Jeff
I have read your instructions and did as you said ... I changed the ETCS fuse and then cleared the codes .. the code has gone and after a while it has returned when I start the engine again and I still have the same issue ... the RPM is about 1500 and can't cross 40 km\h
Last edited by pmontathar; Oct 30, 2023 at 12:43 PM.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.
Lexus IS250 Code P2118
