Suzuki Grand Vitara JB416 / JB420. Manual - part 24

1A-45 Engine General Information and Diagnosis: 

Engine Basic Inspection

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This check is very important for troubleshooting when ECM has detected no DTC and no abnormality has been found 
in “Visual Inspection”.
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”.

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 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”.

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Engine General Information and Diagnosis:  1A-46

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”.

Check ignition control 
related parts referring to 
“Ignition Timing 
Inspection in Section 
1H”.

9

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

“Immobilizer Control System Check in Section 10C”.

Is it in good condition?

Go to Step 10.

Immobilizer control 
system malfunction.

Step

Action

Yes

No

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1, (A)

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1, (A)

10

0

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1A-47 Engine General Information and Diagnosis: 

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”.

Go to “Fuel Pump and 
Its Circuit Check”.

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 in Section 1H”.

Step

Action

Yes

No

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Engine General Information and Diagnosis:  1A-48

13 Check fuel injector for operation

1) Install spark plugs and connect injector connectors.
2) Using sound scope (1), check operating sound of each 

injector (2) when cranking engine.

Was injector operating sound heard from all injectors?

Go to “Engine Symptom 
Diagnosis”.

Go to “Fuel Injector 
Circuit Check”.

Step

Action

Yes

No

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