EMISSION
CONTROL SYSTEMS
25 - :
CALIFORNIA VEHICLE EMISSION CONTROL INFORMATION LABEL-TYPICAL
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IMPORTANT
VEHICLE
INFORAAATION
THIS VEHICLE CONFORMS
TO
U.S.
EPA AND STATE
OF
CALIFORNIA REGULATIONS APPLICABLE
TO 1993
MODEL YEAR NEW
LIGHT-DUTY
TRUCKS
AND
MEDIUM-DUTY VEHICLES PROVIDED
THAT
THIS VEHICLE
IS
ONLY INTRODUCED
INTO
COMMERCE FOR
SALE
IN THE
STATE
OF
CALIFORNIA.
*
BASIC
IGNITION TIMING
AND
IDLE FUEL/AIR
MIXTURE HAVE BEEN
PRESET
AT THE
FACTORY.
SEE THE
SERVICE MANUAL
FOR
PROPER
PROCEDURES
AND
OTHER
ADDITIONAL
INFORMATION.
o
ADJUSTMENTS MADE
BY
OTHER
THAN
APPROVED
SERVICE MANUAL PROCEDURES
MAY
VIOLATE
FEDERAL
AND
STATE
LAWS.
CAUTION:
APPLY
PARKING BRAKE
WHEN
SERVICING
VEHICLE.
5.2
LITER
PCR360T5FHB2
PTAPG
SPARK
PLUGS
.035
in.
GAP RC12YC NO ADJUSTMENTS NEEDED
RHC/CO/NOx
STDS.
.50/9.0/1.0
TEE
CONNECTOR
W/ORIFICE
TO
ATMOSPHERE
ROLLOVER
VALVE
W/ORIFICE
/
PCV
VALVE-
TO
CLIMATE
CONTROL,
VEHICLE SPEED
CONTROL,
4X4
AXLE
(WHEN
EQUIPPED)
INTAKE
MANIFOLD"
ORIFICE
—
M
r-
M
EVAP
PURGE
SOLENOID
FILTER
THROTTLE
BODY
FUEL
TANK PRESSURE
RELIEF/
ROLLOVER
VALVE
W/ORIFICE
FUEL
PRESSURE
REGULATOR
1
r—O
O^-CRANKCASE
TO
AIR
CLEANER
APPLICABLE
TO
35
GALLON
FUEL
TANK
ONLY
J9325-23
CANADA VEHICLE EMISSION CONTROL INFORMATION LABEL-ATYPICAL
VEHICLE
EMISSION
CONTROL
INFORAAATION
THIS
VEHICLE
WAS
BUILT
FOR
SALE
IN
CANADA
AND WAS
DESIGNED
TO
MEET
THE
EMISSION
REQUIREMENTS
OF THE
CANADA
MOTOR
VEHICLE
ACT.
IT
WAS NOT
DESIGNED
TO
COMPLY
WITH
THE
REQUIREMENTS
OF
OTHER
COUNTRIES.
'
BASIC
IGNITION TIMING
AND
FUEL
INJECTION
MIXTURE HAVE BEEN
PRESET
AT
THE
FACTORY.
ADJUSTMENTS
SHOULD
NOT
BE
MADE
DURING
ROUTINE
SERVICE.
CAUTION:
APPLY
PARKING BRAKE
WHEN
SERVICING
VEHICLE.
5.2
LITRES
SPARK
PLUGS
0.9
mm GAP
RC12YC
RENSEIGNEMENTS RELATIFS
AU
SYSTEME
ANTIPOLLUTION
LE
PRESENT
VEHICULE
A
ETE
FABRIQUE'
POUR ETRE
VENDU
AU
CANADA
ET
IL
A
ETE
CONCU
DE
MANIERE
A
SE
CON
FORMER
AUX
NORMES
ANTIPOLLUTION
DE LA LOI SUR LA
SECURITE
DES
VEHICULES
AUTOMOBILES
DU
CANADA.
IL
N'EST
PAS
DESTINE'
A SE
CON
FORMER
AUX
NORMES
D'AUTRES
PAYS.
*
LE
CALAGE
DE
L'ALLUMAGE
INITIAL
ET LE
MELANGE
D'INJECTION
D'ESSENCE
ONT
ETC:
PREREGLE'S
A
L'USINE.
N'EFFECTUEZ
AUCUN
REGLAGE
LORS
DE
TRAVAUX
D'ENTRETIEN
REGULIERS.
AVERTISSEMENT:
SERREZ
LE
FREIN
DE
STATIONNEMENT
POUR
FAIRE
L'ENTRETIEN
OU
LA
RE'PARATION
DU
VEHICULE.
5.2
LITRES
,
BOUGIES
ECARTEMENT
0.9 mm
RC12YC
ROLLOVER VALVE W/ORIFICE CLAPET DE DECHARGE AVEC AJUTAGE EVAP PURGE SOLENOID
E'LECTROVALVE
DE
_
FUEL TANK PURGE
DU
FILTRE RESERVOIR
D'ESSENCE
-
A CHARBON ACTIF /
TO CLIMATE CONTROL,
VEHICLE SPEED CONTROL.
4X4 AXLE (WHEN EQUIPPED)
VERS LA COWMAN DE
DE
TEMPERATURE. LE REGULATEUR DE VITESSE, LESSIEU
4X4 (LORSQU'AINSI EQUIPE')
INTAKE MANIFOLD ORIFICE AJUTAGE DE LA TUBULURE D'ADMISSION FUEL TANK PRESSURE RELIEF/
I
ROLLOVER VALVE W/ORIFICE
CLAPET DE DECHARGE
DU
RESERVOIR D'ESSENCE AVEC AJUTAGE FUEL PRESSURE REGULATOR
REGULATEUR DE PRESSION DE CARBURANT CHECK VALVE W/ORIFICE
SOUPAPE
A
DOUBLE EFFET
-
AVEC AJUTAGE AAAP SENSOR
"
CAPTEUR DE PRESSION
ABSOLUE DE LA TUBULURE THROTTLE BODY
CORPS DE PAPILLON APPLICABLE
TO
35
GALLON FUEL TANK ONLY
UNIQUEMENT APPLICABLE
AU
RESERVOIR D'ESSENCE DE
132
L
25
- 12
EMISSION
CONTROL
SYSTEMS
EGR
DIAGNOSIS
CHART
NOTE: ALL TESTS MUST BE MADE
WITH
FULLY
WARM ENGINE RUNNING CONTINUOUSLY FOR
AT
LEAST TWO MINUTES
WARNING: BE SURE
TO
APPLY PARKING BRAKE AND/OR BLOCK WHEELS BEFORE PERFORMING IDLE CHECK
OR
ADJUSTMENT,
OR ANY
ENGINE RUNNING TESTS
OR
ADJUSTMENTS.
Condition
Possible Cause
Correction
EGR
VALVE STEM
DOES
NOT MOVE
ON
SYSTEM
TEST.
(a) Cracked, leaking, disconnected or
plugged hoses.
EGR
VALVE STEM
DOES
NOT MOVE
ON
SYSTEM
TEST.
OPERATES
NORMALLY
ON EXTERNAL
VACUUM
SOURCE.
ENGINE
WILL
NOT
IDLE.
DIES OUT
ON
RETURN
TO
IDLE
OR
IDLE
IS
VERY ROUGH
OR SLOW.
(a) Defective control system—Plugged passages.
(b) Defective control system—solenoid or solenoid control circuit,
(a) High EGR valve leakage in closed
position.
(b) EGR tube to intake manifold leak.
(c) Solenoid or control signal to solenoid failure. (a)
(b)
(a)
(b)
(a) Verify correct hose connections and leak
check and confirm that alt hoses are open.
If defective hoses are found, replace hose
harness.
Disconnect hose harness from EGR vacuum
transducer and connect auxiliary vacuum supply. Raise engine rpm to 2000 rpm and hold. Apply 10" Hg vacuum while checking
valve movement. If no valve movement oc
curs,
replace valve/transducer assy. If valve
opens (approx. 3mm or 1/8" travel), hold
supply vacuum to check for diaphragm
leakage. Valve should remain open 30
seconds or longer. If leakage occurs, replace
valve/transducer assy. If valve is satisfac
tory, check control system. Remove throttle body and inspect port (slot
type) in throttle bore and associated passage in throttle body. Use suitable sol
vent to remove deposits and check for flow
with light air pressure. Normal operation
should be restored to EGR system. Refer to Group 14. General Diagnosis "On
Board Diagnostics" to check solenoid.
If removal of vacuum hose from EGR valve
does not correct rough idle,
(a
1)
Turn
engine off. Remove the air cleaner ex posing the inlet to the throttle body.
(a2) Disconnect the backpressure hose from the EGR valve.
(a3) Using a nozzle with a rubber grommet con nection, direct compressed air (50 to 60 psi)
down through the steel backpressure tube on
the EGR valve while opening and closing the
throttle blade.
(a4) If the sound from the compressed air changes distinctly in step a3, the poppet is leaking
and air is entering the intake manifold. Replace the EGR valve.
Remove tube and visually inspect tube seal
on gasket. Tube end should be uniformally
indented on gasket with no signs of leak. If
signs of exhaust gas leakage are present, replace gaskets and tighten flange nuts to
23 N-m (200 in. lbs.). If an intake plenum
leak persists, replace EGR tube and gaskets,
following installation instructions.
Verify correct hose connections and leak
check and confirm that all hoses are open. If defective hoses are found, replace nose
harness.
(cl) Refer to Group 14, General Diagnosis "On Board Diagnostics" to check solenoid. (b)
(c)
NOTE:
DO
NOT
ATTEMPT
TO CLEAN BACK-PRESSURE EGR VALVE, REPLACE
ENTIRE VALVE/TRANSDUCER ASSEMBLY
IF
NECESSARY.
9225-26
