Hwy mode in $61 vs top gear (ANLU tune, e.g.)

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Feb 5, 2009 | 11:24 PM

BigBadLou

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Car: '91 Z28 convertible

Engine: TPI

Transmission: T5

Axle/Gears: 3.27 posi disc

Hwy mode in $61 vs top gear (ANLU tune, e.g.)

Simple question: is the highway mode in the $61 code (let's say ANLU bin) invoked only in top gear? Or does the ECM not care about that input for this specific part?
More vaguely: does the transmission have to be in top gear with the torque converter locked up to engage hwy mode?

I couldn't find anything in the search engine.

Thanks in advance.
Lou

Feb 6, 2009 | 10:50 AM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Re: Hwy mode in $61 vs top gear (ANLU tune, e.g.)

Note that there is both a hiway SA mode and a hiway fuel mode. There are enabled individually (not tied together).

There isn't a 4th gear or TCC lockup requirement for either.

RBob.