Inverter Pump Change Causing Maint Required Light To Flash Couple Times?

I just changed my inverter pump (drivers side, in front of driver's side headlamp) on my 2009 Prius Touring model. I did this because I had already changed out the three-way valve in order to eliminate the solid "check engine" light, which was not the problem. I have over 180K miles on the odometer. Now, not only did the Check engine light stay on, I have an issue with the "Maint Required" light now that I did not notice before. I have purged the inverter coolant system of air after the pump change. Immediately after doing so, upon startup and again this morning, the "Maint Required" light flashed a couple times and then stayed off. I should note that when I inspected the coolant reservoir with the cap off, I noticed a circulating of the fluid, which I believe indicated the pump I changed was working. I replaced the pump with an OEM part. I do not know if the old pump was defective or if this is just another change of a part that did not need to be changed. Any ideas please?

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Answer #1: Posted by waelsaidani1 on January 2nd, 2017 7:11 AM

waelsaidani1

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This light comes on to remind you to change your oil. It comes on 5,000 miles after the last time it was reset.

It comes on strictly as a function of those miles-it has no way of knowing whether your oil has or hasn't been changed in the interim-and it never, ever is an indication of something being wrong.

Sometimes shops neglect to reset the maintenance-required meter if the light doesn't happen to be on yet when they are changing the oil. Many quick-lube shops simply don't know how to reset it.

The maintenance-required light is easy to reset. On most Toyotas you simply:

Turn the key to the on position.
Determine that the odometer reading is displayed. (For some models, it's the trip-meter "A" that you want to be displaying.)
Turn the key back off.
Push and hold the reset button for the trip meters. (Same button as used to navigate between the odometer and the two trip meters.)
While continuing to depress the reset button, turn the key back to the "on" position, but not so far as the "start" position. The odometer display should come up with a series of dashes that disappear one by one. When they've all disappeared, a series of zeros will display. Continue holding the reset button until all of the zeros clear and the odometer (or trip meter "A") reading returns.The maintenance-required light should be off, and the vehicle will now be counting toward the next 5,000 interval, at which time it will turn on again.