MACS Service Reports - 2016 - APR5

and compressor clutch status on a new Toyota sans
clutch do appear on the best of non-factory / OEM
scan tools once in a while. Take a look at Figure
8. Notice the compressor voltage hovering around
280 volts while compressor current and speed turn
completely on and off. Is this a "Swiss Cheese
hole?" Maybe, or it may simply be due to the design
of a CAN bus controlled electric scroll compressor.
The supply of high voltage DC power is constant
on these compressors. The CAN bus message tells
a small inverter to make that steady supply of high
voltage DC current into 3-phase AC current that
varies to control compressor output.

Diagnostic Tool and Electronic
Service Information Updates
Customizing the HVAC electronic controls (Figure 9) is certainly not unique to Toyota. GM among
others has allowed temperature door skewing (offsets) for years. The scenario of customization with
GM originated with allowing techs to make the
blend door go a little further cold or hot when set
to the customer 's desired setting. One might think
that if you aren't warm enough at 78°F, just move
the HVAC temperature setting to 80°F. Some customers are so used to their residential HVAC system's performance (how they feel at X degrees set
at home) that they simply feel their vehicle should
cool them or warm them the same way. Rather than
say, "Sorry, that's the way the engineers made it,"
some models allow for scan tool tweaking of the
HVAC head to make the customer happy. Being an
advanced bi-directional command / configuration
procedure, your OE Level (a.k.a. NOT a factory scan
tool) may perform such features flawlessly, attempt
to perform the function and then display an error
message or simply make you think it performed the
function and not tell you it didn't. This is why you
should check functions before and after such an advanced EEPROM "write to" A/C customization to
ensure you're successful in getting your customer 's
HVAC into an improved state of operation. When
a true dealer OEM factory tool is available (Figure
10), most techs know to leave the OE Level scanner
in the box and grab the factory unit for an advanced
function such as A/C customization. Since most
shops don't have many (if any) true factory scan
tools (GM Tech 2, Ford IDS, Nissan Consult, etc.),
we need to think outside the box to consider all alternatives when facing the need to perform over the
top functions that often are lost in the holes of coverage and functionality.
Alternatives include teaming up with other shops
to form a cooperative 'divide and conquer ' plan for
scan tool purchases and sharing. In other words,
your good buddy and friendly competitor on the

April 2016

5

north side of town seems to have a bit more Ford
business than you do while you have quite a few
regular customers (or a fleet account) with Chrysler
products. You both agree that your shop will purchase a Chrysler Wi-Tech, annual subscription and
dedicated laptop while his shop purchases a Ford
IDS, subscription and dedicated laptop. On those
occasions when your trusty, battle proven ABC OE
Level scanner can't get the advanced scanning /
configuration function performed satisfactorily,
you borrow his tool knowing that tomorrow you
may be returning the favor with your Chrysler tool.
Some methods of rising to daily challenges by
other successful repair shops are always worth considering. I first learned of this creative co-op idea in
a hybrid class several years ago. Hybrids have always been over the top with complexity and therefore very likely to require the services of a true factory scan tool. Some shops who wanted to work on
multiple hybrid OEMs tried out the idea and loved
it. More recently I became familiar with a nationally franchised group of high end repair shops who
have been successful with this cooperative scanner
sharing concept. For programming and flashing,
most of these shops have a Ford IDS which often
times proves to be more reliable and user friendly
for Ford flashes compared to a true universal J2534
pass-thru programmer. On the other hand, not every one of their shops has every factory scan tool.
Combine a bunch of shops in a large metro market
and chances are most OEM bases are covered. As
has been said for eons, "No man is an island." Dare
we apply this concept to auto repair shops?
Select OEM scan tools are sometimes simply a
download of software to your PC with a paid subscription and registration procedure IF you own
a J2534 universal pass-through programmer. If
you've not made the plunge for one of these tools,
you might consider it. The future of one piece of PC
interface (a J2534 box) combined with a subscription has begun. As the Right to Repair acts come
up before state and federal law makers, the OEMs
have been taking note. Toyota and Lexus for example have validated several models of J2534's on
the market for being compatible with not only their
programming process but also for their factory
Techstream Lite scan tool software. Reliable sources
say even if the particular brand of J2534 box you
own isn't on the official Toyota validation list, their
Techstream Lite will probably work OK with it. On
the other hand, GM's GDS2 software and Tech2WIN
(virtual GM Tech2 for Windows) the GM dealers
use on their OEM dedicated J2534 "MDI" pass-thru programmer will only work on select universal
J2534 pass-thru programmers. Drew Technology's
CarDAQ-M is one of the J-Tools that plays

MACS Service Reports



Table of Contents for the Digital Edition of MACS Service Reports - 2016

MACS Service Reports - 2016 - JAN1
MACS Service Reports - 2016 - JAN2
MACS Service Reports - 2016 - JAN3
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