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Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 79

1A-263 Engine General Information and Diagnosis: For Petrol Engine Model

Wire circuit check
1) Disconnect radiator cooling fan relay No.3 from relay

box with ignition switch turned OFF.

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

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

Is voltage 10 – 14 V?

Go to Step 5.

“BLU/BLK” wire is open
circuit.

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.

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.

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.

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

Cooling Fan Relay Inspection: For Petrol Engine Model
in Section 1F”.

Is it in good condition?

Go to Step 9.

Replace radiator cooling
fan relay.

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

Cooling Fan Motor On-Vehicle Inspection: For Petrol
Engine Model in Section 1F”.

Is it in good condition?

Substitute a known-
good ECM and recheck.

Replace radiator cooling
fan motor.

Step

Action

Yes

Engine General Information and Diagnosis: For Petrol Engine Model 1A-264

Repair Instructions

Idle Speed and IAC Throttle Valve Opening
Inspection

S6JB0A1116001

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 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: For Petrol Engine Model in
Section 1C”.

Engine idle speed (M16 Engine)
A/C OFF: 660

± 50 rpm

A/C ON: 750

± 50 rpm

Engine idle speed (J20 Engine)
A/C OFF: 650

± 50 rpm (IAC duty: 5 – 55%)

A/C ON: 750

± 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)

I5JB0A110106-01

1A-265 Engine General Information and Diagnosis: For Petrol Engine Model

Special Tools and Equipment

Special Tool

S6JB0A1118001

09912–58432

09912–58442

Fuel pressure gauge hose

Fuel pressure gauge

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

09912–58490

09930–76420

3-way joint & hose

Timing-light (dry cell type)

)

09933–06320

SUZUKI scan tool

ECM check harness (120P)

—

)

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. ) / )

Engine General Information and Diagnosis: For Diesel Engine Model 1A-266

For Diesel Engine Model

Precautions

Precautions on Engine Service

S6JB0A1120001

CAUTION

The following information on engine service
should be noted carefully, as it is important in
preventing damage, and in contributing to
reliable engine performance.

• When raising or supporting engine for any reason, do

not use a jack under oil pan. Due to small clearance
between oil pan and oil pump strainer, jacking against
oil pan may cause it to be bent against strainer
resulting in damaged oil pick-up unit.

• It should be kept in mind, while working on engine,

that 12-volt electrical system is capable of violent and
damaging short circuits.
When performing any work where electrical terminals
could possibly be grounded, ground cable of the
battery should be disconnected at battery.

• Any time the air cleaner, air cleaner outlet hose,

turbocharger, intercooler, intercooler outlet hose or
intake manifold is removed, the intake opening should
be covered. This will protect against accidental
entrance of foreign material which could follow intake
passage into cylinder and cause extensive damage
when engine is started.

Precautions in Diagnosing Trouble

S6JB0A1120002

• Don’t disconnect couplers from ECM, battery cable

from battery, ECM ground wire harness from engine
or main fuse before confirming diagnostic information
(DTC) stored in ECM memory.

• Diagnostic information stored in ECM memory can be

cleared as well as checked by using SUZUKI scan
tool or OBD generic scan tool. Before using scan tool,
read its Operator’s (Instruction) Manual carefully to
have good understanding as to what functions are
available and how to use it.

• Be sure to read “Precautions for Electrical Circuit

Service in Section 00” before inspection and observe
what is written there.

• Replacement of the ECM

Before replacement of the ECM, save the data of
vehicle specification (injector calibration code, EGR /
Inlet throttle valve data register and Diesel PF data
register) into SUZUKI scan tool from ECM according
to procedure described in “Description of ECM
Registration: For Diesel Engine Model in Section 1C”.

• ECM registration:

If ECM is replaced, register vehicle specification (fuel
injector calibration code, key verification code for
immobilizer system) into ECM referring to “Description
of ECM Registration: For Diesel Engine Model in
Section 1C”.

• Communication of ECM, BCM, combination meter,

ABS or ESP

® control module, immobilizer control

module, 4WD control module, keyless start control
module and steering angle sensor (ESP

® model) is

established by CAN (Controller Area Network). (For
more detail of CAN communication for ECM, refer to
“CAN Communication System Description: For Diesel
Engine Model”).
Therefore, handle CAN communication line with care
referring to “Precautions for Electrical Circuit Service
in Section 00”.

• Immobilizer transponder code registration after

replacing ECM
When ECM is replaced with new one or with another
one, make sure to register immobilizer transponder
code to ECM correctly according to “Procedure after
ECM Replacement: For Diesel Engine Model in
Section 10C”.

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