Pep Boys Ep Techs Key Off Evap Webinar

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



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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



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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

Documents

Pep Boys Ep Techs Key Off Evap Webinar