Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 25

1A-47 Engine General Information and Diagnosis: For Petrol Engine Model

Visual Inspection

S6JB0A1114008

Visually check the following parts and systems.

Inspection item

Reference section

• Engine oil – level, leakage

“Engine Oil and Filter Change (Petrol Engine
Model) in Section 0B”

• Engine coolant – level, leakage

“Coolant Level Check: For Petrol Engine
Model in Section 1F”

• Fuel – level, leakage

“Fuel Lines and Connections Inspection in
Section 0B”

• Air cleaner element – dirt, clogging

“Air Cleaner Filter Inspection in Section 0B”

• Battery – fluid level, corrosion of terminal

“Battery Description: For Petrol Engine Model
in Section 1J”

• Water pump belt – tension damage

“Engine Accessory Drive Belt Inspection
(Petrol Engine Model) in Section 0B”

• Throttle valve – operating sound

“Electric Throttle Body Assembly On-Vehicle
Inspection: For Petrol Engine Model in
Section 1C”

• Vacuum hoses of air intake system – disconnection, looseness,

deterioration, bend

“Vacuum Hose and Purge Valve Chamber
Inspection: For Petrol Engine Model in
Section 1B”

• Connectors of electric wire harness – disconnection, friction
• Fuses – burning
• Parts – installation, bolt – looseness
• Parts – deformation
• Other parts that can be checked visually
Also check the following items at engine start, if possible
• Malfunction indicator lamp – Operation

“Malfunction Indicator Lamp (MIL) Check: For
Petrol Engine Model”

• Charge warning lamp – Operation

“Generator Symptom Diagnosis: For Petrol
Engine Model in Section 1J”

• Engine oil pressure warning lamp – Operation

“Oil Pressure Switch Inspection in Section 9C”

• Engine coolant temp. meter – Operation

“Engine Coolant Temperature (ECT) Sensor
Inspection: For Petrol Engine Model in
Section 1C”

• Fuel level meter – Operation

“Fuel Level Sensor Inspection in Section 9C”

• Tachometer – Operation
• Abnormal air being inhaled from air intake system
• Exhaust system – leakage of exhaust gas, noise
• Other parts that can be checked visually

Engine General Information and Diagnosis: For Petrol Engine Model 1A-48

Engine Basic Inspection

S6JB0A1114009

This check is very important for troubleshooting when ECM has detected no DTC and no abnormality has been found
in “Visual Inspection: For Petrol Engine Model”.
Follow the flow carefully.

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check: For
Petrol Engine Model”.

2

Check battery voltage

Is it 11 V or more?

Go to Step 3.

Charge or replace
battery.

3

Is vehicle equipped with keyless start control system?

Go to Step 4.

Go to Step 5.

4

Check keyless start control system malfunction (if
equipped keyless start control system)
1) Check keyless start control system referring to “Keyless

Start System Operation Inspection in Section 10E”.

Is check result satisfactory?

Go to Step 5.

Keyless start control
system malfunction.

5

Is engine cranked?

Go to Step 6.

Go to “Cranking System
Symptom Diagnosis:
For Petrol Engine Model
in Section 1I”.

6

Does engine start?

Go to Step 7.

Go to Step 9.

7

Check idle speed
1) Warm up engine to normal operating temperature.
2) Shift transmission to neutral position for M/T model (“P”

position for A/T).

3) Make sure that all electrical loads are switched off.
4) Check engine idle speed with scan tool.

Is it 600 – 700 (for J20 engine), 610 – 710 (for M16 engine)
r/min.?

Go to Step 8.

Go to “Engine Symptom
Diagnosis: For Petrol
Engine Model”.

I2RH01110005-01

1A-49 Engine General Information and Diagnosis: For Petrol Engine Model

8

Check ignition timing
1) Using SUZUKI scan tool, select “Misc Test” mode on

SUZUKI scan tool and fix ignition timing to initial one.

2) Using timing light (1), check initial ignition timing.

Special tool
(A): 09930–76420

For J20 engine

For M16 engine

Is it 5

°

– 15

°

(for J20 engine), 7

°

– 17

°

(for M16 engine)

BTDC at specified idle speed?

Go to “Engine Symptom
Diagnosis: For Petrol
Engine Model”.

Check ignition control
related parts referring to
“Ignition Timing
Inspection: For Petrol
Engine Model in Section
1H”.

9

Check immobilizer system malfunction (if equipped
immobilizer control system)
1) Check immobilizer control system referring to

“Immobilizer Control System Check: For Petrol Engine
Model in Section 10C”.

Is it in good condition?

Go to Step 10.

Immobilizer control
system malfunction.

Step

Action

Yes

No

I2RH01110006-01

1, (A)

I5JB0A110021-01

1, (A)

10

0

I5JB0A110022-01

Engine General Information and Diagnosis: For Petrol Engine Model 1A-50

10 Check fuel supply

1) Check to make sure that enough fuel is filled in fuel tank.
2) Turn ON ignition switch for 2 seconds and then OFF.
3) Repeat Step 2) a few times.

Is fuel pressure felt from fuel feed hose when ignition switch
is turned ON?

For J20 engine

For M16 engine

Go to Step 12.

Go to Step 11.

11 Check fuel pump for operation

Was fuel pump operating sound heard from fuel filler for
about 2 seconds after ignition switch ON and stop?

Go to “Fuel Pressure
Check: For Petrol
Engine Model”.

Go to “Fuel Pump and
Its Circuit Check: For
Petrol Engine Model”.

12 Check ignition spark

1) Disconnect injector couplers.
2) Remove spark plugs and connect them to high-tension

cords or ignition coil assemblies.

3) Ground spark plugs.
4) Crank engine and check if each spark plug sparks.

Is it in good condition?

Go to Step 13.

Go to “Ignition Spark
Test: For Petrol Engine
Model in Section 1H”.

Step

Action

Yes

No

I5JB0A110023-01

I5JB0A110024-01