Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 20

1A-27 Engine General Information and Diagnosis: For Petrol Engine Model

Diagnostic Information and Procedures

Engine and Emission Control System Check

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Refer to the following items for the details of each step.

Step

Action

Yes

No

1

)

 Customer complaint analysis

1) Perform customer complaint analysis referring to 

“Customer Complaint Analysis”.

Was customer complaint analysis performed?

Go to Step 2.

Perform customer 
complaint analysis.

2

)

 DTC / Freeze frame data check, record and clearance

1) Check for DTC (including pending DTC) referring to 

“DTC / Freeze Frame Data Check, Record and 
Clearance”.

Is there any DTC(s)?

Print DTC and freeze 
frame data or write them 
down and clear them by 
referring to “DTC 
Clearance: For Petrol 
Engine Model”, and go 
to Step 3.

Go to Step 4.

3

)

 Visual inspection

1) Perform visual inspection referring to “Visual Inspection”.

Is there any faulty condition?

Repair or replace 
malfunction part, and go 
to Step 11.

Go to Step 5.

4

)

 Visual inspection

1) Perform visual inspection referring to “Visual Inspection”.

Is there any faulty condition?

Repair or replace 
malfunction part, and go 
to Step 11.

Go to Step 8.

5

)

 Trouble symptom confirmation

1) Confirm trouble symptom referring to “Trouble Symptom 

Confirmation”.

Is trouble symptom identified?

Go to Step 6.

Go to Step 7.

6

)

 Rechecking and record of DTC / Freeze frame data

1) Recheck for DTC and freeze frame data referring to 

“DTC Check: For Petrol Engine Model”.

Is there any DTC(s)?

Go to Step 9.

Go to Step 8.

7

)

 Rechecking and record of DTC / Freeze frame data

1) Recheck for DTC and freeze frame data referring to 

“DTC Check: For Petrol Engine Model”.

Is there any DTC(s)?

Go to Step 9.

Go to Step 10.

8

)

 Engine basic inspection and engine symptom 

diagnosis
1) Check and repair according to “Engine Basic Inspection: 

For Petrol Engine Model” and “Engine Symptom 
Diagnosis: For Petrol Engine Model”.

Are check and repair complete?

Go to Step 11.

Check and repair 
malfunction part(s), and 
go to Step 11.

9

)

 Troubleshooting for DTC

1) Check and repair according to applicable DTC diag. flow.

Are check and repair complete?

Go to Step 11.

Check and repair 
malfunction part(s), and 
go to Step 11.

10 ) Intermittent problems check

1) Check for intermittent problems referring to “Intermittent 

Problems Check”.

Is there any faulty condition?

Repair or replace 
malfunction part(s), and 
go to Step 11.

Go to Step 11.

Engine General Information and Diagnosis: For Petrol Engine Model 1A-28

Step 1: Customer Complaint Analysis
Record details of the problem (failure, complaint) and how it occurred as described by the customer. For this purpose, 
use of such an inspection form will facilitate collecting information to the point required for proper analysis and 
diagnosis.

11 ) Final confirmation test

1) Clear DTC if any.
2) Perform final confirmation test referring to “Final 

Confirmation Test”.

Is there any problem symptom, DTC or abnormal condition?

Go to Step 6.

End.

Step

Action

Yes

No

1A-29 Engine General Information and Diagnosis: For Petrol Engine Model

Customer problem inspection form (Example)

NOTE
This form is a standard sample. It should be modified according to conditions characteristic of each 
market.

 

I2RH01110010-02

Engine General Information and Diagnosis: For Petrol Engine Model 1A-30

Step 2: DTC / Freeze Frame Data Check, Record and 
Clearance
First, check DTC (including pending DTC), referring to 
“DTC Check: For Petrol Engine Model”. If DTC is 
indicated, print it and freeze frame data or write them 
down and then clear them by referring to “DTC 
Clearance: For Petrol Engine Model”. DTC indicates 
malfunction that occurred in the system but does not 
indicate whether it exists now or it occurred in the past 
and the normal condition has been restored now. To 
check which case applies, check the symptom in 
question according to Step 5 and recheck DTC 
according to Step 6 and 7.
Attempt to diagnose a trouble based on DTC in this step 
only or failure to clear the DTC in this step will lead to 
incorrect diagnosis, trouble diagnosis of a normal circuit 
or difficulty in troubleshooting.

Step 3 and 4: Visual Inspection
As a preliminary step, be sure to perform visual check of 
the items that support proper function of the engine 
referring to “Visual Inspection: For Petrol Engine Model”.

Step 5: Trouble Symptom Confirmation
Based on information obtained in “Step 1: Customer 
Complaint Analysis: For Petrol Engine Model” and “Step 
2: DTC / Freeze Frame Data Check, Record and 
Clearance: For Petrol Engine Model”, confirm trouble 
symptoms. Also, reconfirm DTC according to “DTC 
Confirmation Procedure” described in each DTC diag. 
flow.

Step 6 and 7: Rechecking and Record of DTC / 
Freeze Frame Data
Refer to “DTC Check: For Petrol Engine Model” for 
checking procedure.

Step 8: Engine Basic Inspection and Engine 
Symptom Diagnosis
Perform basic engine check according to “Engine Basic 
Inspection: For Petrol Engine Model” first. When the end 
of the flow has been reached, check the parts of the 
system suspected as a possible cause referring to 
“Engine Symptom Diagnosis: For Petrol Engine Model” 
and based on symptoms appearing on the vehicle 
(symptoms obtained through steps of customer 
complaint analysis, trouble symptom confirmation and/or 
basic engine check) and repair or replace faulty parts, if 
any.

Step 9: Troubleshooting for DTC (See each DTC 
Diag. Flow)
Based on the DTC indicated in Step 6 or 7 and referring 
to the applicable DTC diag. flow, locate the cause of the 
trouble, namely in a sensor, switch, wire harness, 
connector, actuator, ECM or other part and repair or 
replace faulty parts.

Step 10: Intermittent Problems Check
Check parts where an intermittent trouble is easy to 
occur (e.g., wire harness, connector, etc.), referring to 
“Intermittent and Poor Connection Inspection in Section 
00” and related circuit of DTC recorded in Step 2.

Step 11: Final Confirmation Test
Confirm that the problem symptom has gone and the 
engine is free from any abnormal conditions. If what has 
been repaired is related to the DTC, clear the DTC once, 
perform DTC confirmation procedure and confirm that no 
DTC is indicated.

Malfunction Indicator Lamp (MIL) Check

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1) Turn ON ignition switch (with engine at stop) and 

check that MIL (1) lights.
If MIL does not light up (or MIL dims) but engine can 
be starting, go to “Malfunction Indicator Lamp Does 
Not Come ON with Ignition Switch ON and Engine 
Stop (but Engine Can Be Started): For Petrol Engine 
Model” for troubleshooting.
If MIL does not light with ignition switch ON and 
engine does not start though it is cranked up, go to 
“ECM Power and Ground Circuit Check: For Petrol 
Engine Model”.

2) Start engine and check that MIL turns OFF.

If MIL remains ON and no DTC is stored in ECM, go 
to “Malfunction Indicator Lamp Remains ON after 
Engine Starts: For Petrol Engine Model” for 
troubleshooting.

1

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