September 2022 - 30
TOOL BRIEFING
even use a Fluke 88 automotive DVOM
to test coil resistances and available voltage.
Always check your service information
for wiring diagrams when performing
pinpoint testing on the ignition systems.
When we begin any diagnosis at my
shop, we always start with duplicating
the customer's concern. If you cannot
duplicate the concern, how are you supposed
to find it? Once we have duplicated
the concern, we will typically scan all the
computers in the vehicle for trouble codes.
Now that we have collected that data, we
will go to Identifix (Figure 5) to look for
TSBs, recalls, and common failures. We
will use that as guidance when we begin
testing the vehicle to confirm the concern.
We recently had a 2020 Chevrolet
p Figure 3- A Matco Tools diesel compression tester on the left, a Snap-on gasoline engine
compression tester in the middle, and a Star products cylinder leakage tester on the right.
Silverado with the new 3.0L Duramax
Diesel. The customer's concern was the
vehicle entering limp home mode with a
service wrench light and check engine light.
If the customer cycled the key, the service
wrench light would reset. The vehicle had
been to the dealer at least once for this concern
but was unable to duplicate the concern.
We were able to duplicate the customers
concern but not on a repeatable basis. We
grabbed our Autel Ultra scanner for the job
since it will also provide a network Topology
map when performing a full vehicle scan
(Figure 6). We did find the vehicle to have
three trouble codes related to the problem:
* P0202:00 Cylinder 2 injector control
circuit
* P0216:00 Injection timing control
circuit
* P0300:00 Random or multiple cylinder
misfire
When checking the vehicle service
information from Mitchell, we checked
TSBs and found an applicable TSB for the
engine wire harness having chaffing issues
throughout the engine compartment. Our
next step was to remove the left front inner
fender liner to access the PCM and to gain
access to the wire harness. The bulletin was
very good at listing the rub points that were
common, making our job easier.
We hooked up our Snap-on Zeus
p Figure 4- The many Autel scan tools in our shop.
30 PTEN SEPTEMBER 2022 www.VehicleServicePros.com
oscilloscope with the Snap-on low amp
clamp and also a fuse tap from AES Wave
http://www.VehicleServicePros.com
September 2022
Table of Contents for the Digital Edition of September 2022
EDITOR'S NOTE
NEW PRODUCTS
DIAGNOSTIC TECH
TOOL BRIEFING
TOOL REVIEWS
INNOVATION AWARDS
CATEGORY SPOTLIGHT
BIG-TIME BOXES
September 2022 - 1
September 2022 - 2
September 2022 - 3
September 2022 - 4
September 2022 - 5
September 2022 - 6
September 2022 - 7
September 2022 - EDITOR'S NOTE
September 2022 - 9
September 2022 - NEW PRODUCTS
September 2022 - RSC1
September 2022 - RSC2
September 2022 - 11
September 2022 - 12
September 2022 - 13
September 2022 - 14
September 2022 - 15
September 2022 - 16
September 2022 - 17
September 2022 - 18
September 2022 - 19
September 2022 - DIAGNOSTIC TECH
September 2022 - 21
September 2022 - 22
September 2022 - 23
September 2022 - 24
September 2022 - 25
September 2022 - TOOL BRIEFING
September 2022 - 27
September 2022 - 28
September 2022 - 29
September 2022 - 30
September 2022 - 31
September 2022 - 32
September 2022 - 33
September 2022 - TOOL REVIEWS
September 2022 - 35
September 2022 - 36
September 2022 - 37
September 2022 - 38
September 2022 - 39
September 2022 - INNOVATION AWARDS
September 2022 - 41
September 2022 - CATEGORY SPOTLIGHT
September 2022 - 43
September 2022 - 44
September 2022 - 45
September 2022 - 46
September 2022 - 47
September 2022 - 48
September 2022 - 49
September 2022 - 50
September 2022 - 51
September 2022 - 52
September 2022 - 53
September 2022 - 54
September 2022 - 55
September 2022 - 56
September 2022 - 57
September 2022 - BIG-TIME BOXES
September 2022 - 59
September 2022 - 60
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