Suzuki Grand Vitara JB627. Manual — part 73

1A-241 Engine General Information and Diagnosis:

5

Radiator cooling fan control check
1) Disconnect connector from radiator cooling fan motor

No.2 with ignition switch turned OFF.

2) Turn ignition switch ON.
3) Measure voltage between “BLU” wire terminal of radiator

cooling fan relay No.3 connector and vehicle body
ground.

Is voltage 0 V?

Go to Step 6.

“BLU” wire is shorted to
other circuit.

6

Wire circuit check
1) Measure resistance between “BLU” wire terminals of

radiator cooling fan relay No.3 connector and radiator
cooling fan motor No.2 connector with ignition switch
turned OFF.

Is resistance below 3

Ω

?

Go to Step 7.

“BLU” wire is open or
high resistances.

7

Wire circuit check
1) Disconnect radiator cooling fan relay No.2 from relay

box.

2) Measure resistance between “BLK” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground.

Is resistance below 3

Ω

?

Go to Step 8.

“BLK” wire is open
circuit.

8

Radiator cooling fan relay check
1) Check radiator cooling fan relay referring to “Radiator

Cooling Fan Relay Inspection in Section 1F”.

Is it in good condition?

Go to Step 9.

Replace radiator cooling
fan relay.

9

Radiator cooling fan motor check
1) Check radiator cooling fan motor referring to “Radiator

Cooling Fan Motor On-Vehicle Inspection in Section 1F”.

Is it in good condition?

Substitute a known
good ECM and recheck.

Replace radiator cooling
fan motor.

Step

Action

Yes

No

Engine General Information and Diagnosis: 1A-242

Repair Instructions

Idle Speed and IAC Throttle Valve Opening
Inspection

S6JB0B1106001

Before idle speed check, make sure of the following.
• Lead wires and hoses of electronic fuel injection and

engine and emission control systems are connected
securely.

• Valve lash is checked according to maintenance

schedule.

• Ignition timing is within specification.
• ECT sensor performance is in good condition.
• All accessories (wipers, heater, lights, A/C, etc.) are

out of service.

• Air cleaner has been properly installed and is in good

condition.

• No abnormal air drawn in from air intake system.
After all items are confirmed, check idle speed and IAC
throttle opening as follows.

NOTE
Before starting engine, place transmission
gear shift lever in “Neutral” (shift selector
lever to “P” range for A/T vehicle), and set
parking brake and block drive wheels.

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

switch turned OFF.

Special tool
(A): SUZUKI scan tool

2) Warm up engine to normal operating temperature.
3) Check engine idle speed and “IAC throttle opening”

by using “Data List” mode on scan tool to check “IAC
throttle opening”.

4) If check result is out of specification, check EGR

system (EGR valve), EVAP system (EVAP canister
purge valve) and PCV system (PCV valve) for stuck
open or air inhaling. If those system are in good
condition, inspect electric throttle body assembly
referring to “Electric Throttle Body Assembly On-
Vehicle Inspection in Section 1C”.

Engine idle speed
A/C OFF: 650

± 50 rpm (IAC duty: 8 – 25%)

A/C ON: 700

± 50 rpm

5) Check that specified engine idle speed is obtained

with A/C turned ON if vehicle is equipped with A/C.
If not, check A/C system.

(A)

1

I5JB0C110021-02

1A-243 Engine General Information and Diagnosis:

Special Tools and Equipment

Special Tool

S6JB0B1108001

09912–58432

09912–58442

Fuel pressure gauge hose

Fuel pressure gauge

This tool is included in fuel
pressure gauge set (09912-
58413).)

This tool is included in fuel
pressure gauge set (09912-
58413).)

09912–58490

09933–06520

3-way joint & hose

ECM Check Harness 121P

)

)

/ )

SUZUKI scan tool
—
This kit includes following
items. 1. Tech 2, 2. PCMCIA
card, 3. DLC cable, 4. SAE
16/19 adapter, 5. Cigarette
cable, 6. DLC loop back
adapter, 7. Battery power
cable, 8. RS232 cable, 9.
RS232 adapter, 10. RS232
loop back connector, 11.
Storage case, 12.) / )

Aux. Emission Control Devices: 1B-1

Engine

Aux. Emission Control Devices

Component Location

PCV System Location

S6JB0B1203001

4

2

2

1

3

I6JB01120001-01

1. PCV valve

3. Cylinder head cover

2. PCV hose

4. Intake collector