Suzuki Liana RH413, Service Manual

Page: 194 / 1302

1B-2 Aux. Emission Control Devices:
6) Also check that vacuum is felt when engine is
running at idle speed.
If check result is not satisfactory, check vacuum
passage, hoses, EVAP canister purge valve, wire
harness and ECM.
NOTE
The EVAP canister purge system does not
perform purging (vacuum is not detected at
the purge hose) unless the engine is
sufficiently warmed up and the heated
oxygen sensor is activated fully. Also, when
the purge hose is disconnected in Step 5),
the air is drawn into the purge line. As a
result, ECM detects a change in the purge
gas concentration and sometimes stops
purging but this indicates nothing abnormal.
EVAP Canister Purge Valve and Its Circuit
Inspection
S3RH0A1206019
WARNING
!
Do not apply vacuum by mouth; otherwise
harmful fuel vapor can be breathed in.
CAUTION
!
Do not apply vacuum more than –86 kPa (–
12.47 psi); otherwise EVAP canister purge
valve could be damaged.
1) Prepare to operate EVAP canister purge valve as
follows.
a) When using SUZUKI scan tool:
i) Connect SUZUKI scan tool to DLC with
ignition switch OFF and disconnect purge
valve vacuum hoses from pipes.
ii) Turn ON ignition switch, clear DTC and
select “MISC TEST” mode on SUZUKI scan
tool.
Special tool
(A): SUZUKI scan tool
b) When not using SUZUKI scan tool:
i) Disconnect purge valve vacuum hoses from
pipes.
ii) Turn ON ignition switch. Using service wire,
ground “C41-4” terminal of ECM connector
(valve ON) “B” and unground it (valve OFF)
“A”.
2) Check purge valve for operation and vacuum
passage for clog when valve is switched ON and
OFF by using SUZUKI scan tool or service wire.
If check result is not described, check vacuum
hoses, purge valve referring to “EVAP Canister
Purge Valve Inspection”, wire harness and
connections.
WARNING
!
Do not suck the air through valve. Fuel vapor
inside valve is harmful.
EVAP canister purge valve specification
[A] Valve OFF: When vacuum (–53 kPa (–7.69 psi)
to –67 kPa (–9.72 psi)) is applied to hose (1),
vacuum can be applied.
[B] Valve ON: When vacuum (–53 kPa (–7.69 psi)
to –67 kPa (–9.72 psi)) is applied to hose (1),
vacuum can not be applied.
Special tool
(A): 09917–47911
(A)
I3RH0A120002-01
“A”
“C41-4”
“B”
I3RH0A120003-01