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NOTE: The term "flushing" refers to repeatedly draining and refilling the trans with Honda Genuine
ATF-Z1. Don't confuse it with aftermarket flush systems. American Honda still strongly recommends that
you avoid using them on any Honda vehicle.
The original procedure was written for simpler A/Ts that readily upshifted when you ran the vehicle on a lift.
But A/Ts have come a long way since then, and most of the newer ones balk at shifting past 2nd gear
when on a lift, unless you work the shift lever a certain way.
In light of all this, we thought it was high time that the A/T flushing procedure got a facelift. So here's the
latest word on flushing that works for all A/Ts:
1. Set the parking brake, and raise the vehicle on a lift.
2. Drain the trans, and refill it with Honda Genuine ATF-Z1. Refer to the applicable S/M or to ISIS for
3. Start the engine, shift into Drive, and release the parking brake.
4. Push down on the accelerator pedal to raise the vehicle speed to 2,500 rpm.
Neutral and back to Drive. Then go to step 5.
5. Make sure that the trans shifts through all the forward gears and goes into torque converter lockup.
6. Let off the accelerator pedal, and press the brake pedal to drop the vehicle speed to zero. Shift into
Reverse and then into Neutral.
7. Shift into Drive, and repeat steps 4 thru 6 four more times.
8. Set the parking brake, and repeat steps 2 thru 6 two more times.
9. Drain the trans, and reinstall the drain plug with a new sealing washer.
10. Refill the A/T with ATF-Z1.