“Toyota 5L-E engine runaway – injection pump replaced but problem persists”

[Chrisvy]

Here’s a clear, detailed post in English you can publish on a forum:

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Title:
Toyota 5L-E engine runaway – injection pump replaced but problem persists

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Post:
Hi everyone,

I’m dealing with a serious issue on a Toyota Land Cruiser TXL equipped with a 5L-E engine. The engine revs uncontrollably right after startup, as if the accelerator is being pressed, even though no input is given.

At first, we suspected the injection pump, so we replaced it, but the problem remains exactly the same.

Here are the checks and tests I’ve already done:

• Disconnected the accelerator pedal sensor → no change
• Checked / disconnected the TPS → no change
• Checked / disconnected the MAP sensor → no change
• Verified connectors on the injection pump → no improvement
• Compared with another vehicle (Toyota Hiace 5L-E): I noticed similar behavior regarding power supply on some connectors (mostly grounds, no clear power), so I’m not sure if that’s normal

Additional observation:

• The engine shuts off normally when turning the ignition key off, even when it is over-revving

At this point, I’m wondering:

• Could this be a wiring issue (short, wrong connection, or signal problem)?
• Could the ECU be sending incorrect commands to the injection system?
• Is there a known cause of engine runaway on the 5L-E despite replacing the injection pump?

I would really appreciate any guidance or similar experiences.

Thanks in advance!

 

[r2m]

Have you considered the problem to be ECM related? Getting TechStream you'll be able to check to see if the problem is computer related. Are you getting any codes?, https://www.amazon.com/dp/B07BCNPDDG?tag=ihco-20 and don't forget a good OBDII dongle, like OBDLink MX: https://www.amazon.com/dp/B07JFRFJG6?tag=ihco-20
And when you get the OBDLink MX, you can use the OBDLink app on your phone to monitor everything/anything you want on your vehicle, in real time as your driving! Techstream will work any Toyota/Lexus product that's new enough to have OBDII.

Unfortunately most of us on here are North Americans, with a few from Europe and other parts unknown (like yourself), so apologies I can't be of more help.