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8/9/2019 Pep Boys Ep Techs Key Off Evap Webinar
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Chrysler, Dodge, Jeep
Evaporative System Integrity Monitor(EISM)
Webinar
Pep Boys Advanced Technical Training
A course handout for tonight's webinar is available atwww.meatraining.com/ttcfaq.htm
Audio through PC speakers or by phone
If using phone audio call in on # (646) 307-1707
Then enter access # 825-253-502
Training Model
Setting the new standard inAutomotive Technician Training
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Continuous Relevant Training
Training Customized to the Equipment in the shop
Focus is on results through real world content
Company wide support for all levels of technic ians
Training Model
EP Level 2013
Import &
Domestic Air Fuel
and Wideband
Sensors
Asian Driveability
Diagnosis
Import & DomesticKey Off
Evaporative FuelSystem
Gasoline Direct
Injection andHybrid Vehicles
on demand
e-learning module
live web
based training
Instructor Led
Training
live web based
training
on demand
e-learning module
live web
based training
Instructor Led
Training
live web based
training
on demand
e-learning module
live web
based training
Instructor Led
Training
live web based
training
on demand
e-learning module
live web
based training
Instructor Led
Training
live web based
training
16 OCT. 2014
28 OCT. 2014
Schedule now
Available now
1st
Webinar
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Guidelines
Webinar times:
7:00 to 8:00 PM EST 9:00 to 10:00 PM EST
Q and A session at the end ofthe training webinar
HOLD YOUR QUESTIONS TOTHE END!
Questions on this technical
topic only
Any questions about
administrative proceduresor course credit forattendance please referthem to your technicaltrainer or training manager
3 Poll questions to verifyparticipation only, not usedfor pass or fail
Objectives
Gain an understanding of Chrysler
EISM systems as compared to
Chrysler NVLD systems
Learn how Chrysler EISM systems
perform EVAP system leak checks
Apply the proper procedures to find
leaks in the evaporative fuel system
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.020 (.5mm) Leak Diagnosis
.020 (.5mm) specification applies to all Key Off EVAP systems !
Ideal Gas Law
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Temperature to Pressure
Ideal Gas Law
Ideal Gas Law
Fixed volume- fuel tank
Temperature changes,
pressure changes
Pressure changes,temperature changes
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Small Leak code
First Poll Question
Poll question number 1
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Chrysler-Natural Vacuum Leak Detection
New hardware NVLD assembly
NVLD Types
Canister mounted Remote mountedCanister mounted Remote mounted
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Chrysler NVLD Wiring
All leak and purge flow
diagnostics go through
this switch
Vacuum switch Is
normally open
When testing switch
with an ohm meter,there is 130 ohm
resistor in the circuit
NVLD Switch
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NVLD Wiring
ground
Fresh
air
Fromcharcoalcanister
Ventvalveshould
beclosed
PCMsends5voltsto
theswitch(keyoff)
Monitoring of vacuum switch-key off
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ground
Fresh
air
Fromcharcoalcanister
1 of water vacuum pulls
the diaphragm up and
should close the switchcontacts
5voltsgoestozero
volts
when
the
switchcontactsclose
Vacuum Switch Normal Operation
EISM Location
Evaporative System Integrity Monitor
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Service Information Layout of EISM
Diagnostic switch (N.O.)Cover
Pressure relief
valve and seal(large check valve) Vacuum relief
valve and seal
(small check valve)
EISM
assembly
Diaphragm
Internal View of EISM
Vacuum reliefvalve and seal
Canister side of
EISM assembly
Fresh air side of
EISM assembly
EISM diaphragm
Diagnostic switch (N.O.)Pressure relief
valve and seal
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Cover for EISM Removed
coverEISM assembly
Diaphragm
Top Side of Diaphragm
Diaphragm top side,
exposed to fresh air
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Under Side of Diaphragm
Diaphragm button
exposed to canister side
Top View of Diagnostic Switch
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Side View of Diagnostic Switch N.O.
Terminals for Diagnostic Switch N.O.
Diagnostic switch to connector terminals
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Under Side of Diaphragm
Button on the diaphragm
will push on the diagnostic switch
Vacuum on theunder side will pull
diaphragm down
Second Poll Question
Poll question number 2
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Pressure and Vacuum Relief Valves
Pressure relieflarge valve
Vacuum reliefSmall valve
ID and Locations of Relief Valves
Large valve-
Pressure relief
Small valve-
Vacuum relief
Both valves removed
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Relief Valves Sealing Areas
Vacuum relief
Pressure relief
Vacuum relief
Pressure relief
Vacuum relief
Pressure relief
Vacuum relief
Large and Small check Valves (Weights)
Larger diameter = pressure relief
Smaller diameter = vacuum relief
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Review of Relief Valves (Weights)
Pressure reliefVacuum relief
Review of Leak Check Operation
Vacuum reliefvalve and seal
Canister side of
EISM assembly
Fresh air side of
EISM assembly
EISM diaphragm
Diagnostic switch (N.O.)Pressure relief
valve and seal
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EISM and Purge Solenoid Wiring
Ground for the
diagnostic switch
Voltage from the PCM to the
diagnostic switch for testing
VERUS Scanner Example
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Date Stream for EISM Switch
Forcing EVAP Monitor
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Small Leak Test not Included
Engine Running EVAP Test
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Diagnostic Switch Data
Third Poll Question
Poll question number 3
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Purge Solenoid
2 wire
2 port
Normally closed
Opens for purge
Must close during leak
testing
Purge Solenoid
Hose Goes To
Carbon
Canister
VAC
Hose Goes To
Manifold
Vacuum
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Vacuum Port
VAC
Purge solenoid ID
2 wire connector
Port to canister
Intake manifold
vacuum source
19 inches ofvacuum NORMALLY
CLOSED
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Purge solenoid wiring diagram
PCM pulses
power to the
solenoid on
the pink/black
PCM
maintains
ground on the
violet/red wire
Controlling Purge Solenoid - Normal
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Controlling Purge Solenoid - Blocking
Controlling Purge Solenoid - Flow
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Leak Testing EVAP System
EISM assembly
located on the
fresh air side of
the canister
Purge solenoid
Intake manifold
Fresh air
filter
Fuel tank
Filler neck
Control valve
Wiring and EISM Assembly First !
Ground for the
diagnostic switch
Voltage from the PCM to the
diagnostic switch for testing
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Smoke Testing From 3 Locations
EISM assembly
located on the
fresh air side of
the canister
Purge solenoid
Intake manifold
Fresh air
filter
Fuel tank
Filler neck
Control valve
Purge line
Filler neck
Fresh air line
Soapy water
Summary
Chrysler EISM systems perform there
very small leak check with vehicle not
running, KEY OFF
The VERUS scanner should be used to
help find problems with the vehicle
Wiring problems can cause EVAPsystem performance codes
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Q and A session- Thank you for attending
Download of handout for tonight's course available at
www.meatraining.com/ttcfaq.htm
Q and A session is voluntary
Questions are repeated to whole group anonymously
No names attached to the questions
Questions on this technical topic only
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