Suzuki Grand Vitara JB627. Manual - part 74

1B-2 Aux. Emission Control Devices: 

Diagnostic Information and Procedures

EGR System Inspection (If Equipped)

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1) Connect SUZUKI scan tool to DLC (1) with ignition 

switch turned OFF.

Special tool
(A):  SUZUKI scan tool

2) Start engine and warm it up to normal operating 

temperature.

3) With engine idling (without depressing accelerator 

pedal), open EGR valve by using “MISC. TEST” 
mode. In this state, according as EGR valve opening 
increases engine idle speed drops. If not, possible 
cause is clogged EGR gas passage, stuck or faulty 
EGR valve.

EVAP Canister Purge System Inspection

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WARNING

!

 

The front wheels rotates when servicing the 
vehicle with the 4WD system. Therefore, do 
not service near the front wheels. Or, there is 
a possibility of the severe injury.

 

1) Warm up engine to normal operating temperature.
2) Hoist vehicle so that all wheels rotate freely.

3) Set M/T in “Neutral” or A/T in “P” position and 

parking brake.

4) Disconnect purge hose (1) from purge pipe.
5) Place finger against the end of disconnected hose 

(1) and check that vacuum is not felt there when 
engine is running at idle speed.

6) Release parking brake lever, set M/T in “1st” or A/T 

in “L”.

7) Also check that vacuum is felt when engine speed is 

increased to higher than about 1,500 r/min. and keep 
it for 3 min. or more. If check result is not described 
in Steps 5) and 7), check EVAP canister purge valve, 
wire harness and vacuum passage.

1. SUZUKI scan tool display
2. EGR valve opening (0: Close, 100: Full Open)

(A)

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Aux. Emission Control Devices:  1B-3

Repair Instructions

EVAP Canister Purge Valve and Its Circuit 
Inspection

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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.
When using SUZUKI scan tool:
a) Connect SUZUKI scan tool to DLC with ignition 

switch OFF and disconnect vacuum hoses from 
each pipe.

Special tool
(A):  SUZUKI scan tool

b) Turn ignition switch ON, clear DTC and select 

“MISC TEST” mode on SUZUKI scan tool.

When not using SUZUKI scan tool:

NOTE
Before performed this check, be sure to read 
the “Precautions of ECM Circuit Inspection in 
Section 1A”.

 

a) Disconnect purge valve vacuum hoses from 

intake manifold and purge pipe.

b) Remove ECM cover.
c) Connect special tool between ECM and ECM 

connector referring to “Inspection of ECM and Its 
Circuits in Section 1A”

d) Turn ON ignition switch.

Using service wire, ground “C37-10” terminal 
circuit of special tool (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, wire harness and connections.

EVAP canister purge valve
Valve OFF [A]: When vacuum (–53 kPa (–7.69 psi) 
to –67 kPa (–9.72 psi)) is applied to hose (1), 
vacuum is maintained.
Valve ON [B]: When vacuum is applied to hose 
(1), air goes into hose (2).

Special tool
(A):  09917–47011

(A)

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C37-10

“A”

“B”

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2

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(A)

(A)

[A]

[B]

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1B-4 Aux. Emission Control Devices: 

EVAP Canister Purge Valve Inspection

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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) With ignition switch OFF, disconnect coupler from 

canister purge valve.

2) Check resistance between two terminals of EVAP 

canister purge valve (1).
If resistance is as specified, proceed to next 
operation check. If not, replace EVAP canister purge 
valve.

Resistance of EVAP canister purge valve
28 – 35 

Ω at 20 °C (68 °F)

3) Remove EVAP canister purge valve from intake 

manifold.

4) With coupler disconnected, apply vacuum (–53 kPa 

(–7.69 psi) to –67 kPa (–9.72 psi)) to pipe (1) using a 
special tool. Check that vacuum is manifold. If 
vacuum can not be maintained, replace EVAP 
canister purge valve.

5) In this state, connect 12 V-battery to EVAP canister 

purge valve terminals.
If vacuum can not be maintained, EVAP canister 
purge valve is in good condition.
If maintained, replace EVAP canister purge valve.

WARNING

!

 

Do not suck the through valve. Fuel vapor 
inside valve is harmful.

 

Special tool
(A):  09917–47011 

6) Connect vacuum hoses.
7) Connect EVAP canister purge valve coupler 

securely.

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(A)

(A)

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Aux. Emission Control Devices:  1B-5

EVAP Canister Removal and Installation

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Removal

1) Hoist vehicle.
2) Disconnect hoses (1) from EVAP canister (2).
3) Remove EVAP canister with its bracket (3).

4) Remove EVAP canister from its bracket.
5) Disconnect hoses from EVAP canister.

EVAP Canister Inspection

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WARNING

!

 

Do not suck nozzles on EVAP canister.
Fuel vapor inside EVAP canister is harmful.

 

1) Check outside of EVAP canister visually.
2) Disconnect vacuum hoses from EVAP canister.
3) Check that there is no restriction of flow through 

purge pipe (1) and air pipe (2) when air is blown (4) 
into tank pipe (3).
If any faulty condition is found in this inspection, 
replace EVAP canister.

Vacuum Passage Inspection

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1) Start engine and run it at idle speed.
2) Disconnect vacuum hose from EVAP canister purge 

valve.

3) With finger placed on the hole of disconnected hose, 

check if vacuum is applied.
If it is not applied, clean vacuum passage by blowing 
compressed air.

PCV Hose Inspection

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NOTE
Be sure to check that there is no obstruction 
in PCV valve or its hoses before checking 
engine idle speed / IAC duty for obstructed 
PCV valve or hose hampers its accurate 
checking.

 

Check hoses for connection, leakage, clog, and 
deterioration.
Replace as necessary.

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2

3

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1. EVAP canister purge valve

4. EGR pipe (if equipped)

2. EVAP canister purge valve hose

5. EGR valve (if equipped)

3. Intake collector

6. PCV hose

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