Suzuki Grand Vitara JB419. Service manual - part 9

Engine General Information and Diagnosis: 1A-13

Diagnostic Information and Procedures

Malfunction Indicator Lamp (MIL) Check

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Malfunction indicator lamp (1) signals an antipollution
system failure.
Check that it lights up for 3 seconds after the ignition
switch is turned ON, and then it goes OFF (automatic
test procedure).
If light remains ON after an automatic test procedure, go
to “DTC Check”.
After the ignition switch is turned ON, if light does not
light up or remains ON, check that malfunction indicator
lamp circuit.

Injection Warning Light (Gravity 1 Fault) Check

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Injection warning light (1) serves to indicate proper
functioning and to signal system failures.
After the ignition switch is turned ON, if lights remains
ON, go to “DTC Check”.
If injection warning light flashes ON and OFF, there is
some trouble in the immobilizer control system referring
to “On-Board Diagnostic System Description (Self-
diagnosis Function) in Section 10C”.

Red Stop Warning Light (Gravity 2 Fault) Check

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Red stop warning light (1) serves to indicate proper
functioning and to signal system failures.
After the ignition switch is turned ON. if light remains ON,
go to “DTC Check”.

t: Inlet throttle valve

u: EGR valve

v: Boost pressure control solenoid valve

w: Additional heater relay No.1

x: Additional heater relay No.2
y: Additional heater relay No.3

Information sensors

Control devices

Others

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1A-14 Engine General Information and Diagnosis:

Engine and Emission Control System Check

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

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.

Step

Action

Yes

)

Customer complaint analysis

1) Perform customer complaint analysis referring to “Step

1: Customer Complaint Analysis: ”.

Was customer complaint analysis performed?

Go to Step 2.

Perform customer
complaint analysis.

)

Visual inspection

1) Perform visual inspection referring to “Step 2: Visual

Inspection: ”.

Is there any faulty condition?

Repair or replace
malfunction part, and go
to Step 3.

Go to Step 3.

)

DTC check, record and clearance

1) Check for DTC referring to “Step 3: DTC Check, Record

and Clearance: ”.

Is there any DTC(s)?

Record and clear DTC
referring to “DTC
Clearance” and go to
Step 5.

Go to Step 4.

)

Engine basic inspection and fault finding – customer

complaints
1) Check and repair according to “Step 4: Engine Basic

Inspection and Fault Finding-Customer Complaints: ”.

Is there any faulty condition?

Repair or replace
malfunction part and
then go to Step 8.

Go to Step 8.

)

Recheck DTC

1) Recheck DTC referring to “Step 5: Recheck DTC: ”.

Is there any DTC(s)?

Go to Step 6.

Go to Step 7.

)

Troubleshooting for DTC

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

referring to “Step 6: Troubleshooting for DTC (See each
DTC Diag. Flow): ”.

Is there any faulty condition?

Repair or replace
malfunction part and
then go to Step 8.

Go to Step 7.

)

Intermittent problems check

1) Check for intermittent problems referring to “Step 7:

Intermittent Problems Check: ”.

Is there any faulty condition?

Repair or replace
malfunction part(s), and
go to Step 8.

Go to Step 8.

)

Final confirmation test

1) Clear DTC if any.
2) Perform final confirmation test referring to “Step 8: Final

Confirmation Test: ”.

Is there any problem symptom, DTC or abnormal condition?

Go to Step 5.

End.

Engine General Information and Diagnosis: 1A-15

Customer problem inspection form (Example)

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

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1A-16 Engine General Information and Diagnosis:

Step 2: 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”.

Step 3: DTC Check, Record and Clearance
First, check DTC, referring to “DTC Check”. If DTC is
indicated, record and clear DTC by referring to “DTC
Clearance”.
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 4: Engine Basic Inspection and Fault Finding-
Customer Complaints
Perform basic engine check according to “Engine Basic
Inspection” first. When the end of the flow table has been
reached, check the parts of the system suspected as a
possible cause referring to “Fault Finding-Customer
Complaints” 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 5: Recheck DTC
Refer to “DTC Check” for checking procedure.

Step 6: Troubleshooting for DTC (See each DTC
Diag. Flow)
Based on the DTC indicated in Step 5 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 7: 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 in related manual” and related circuit of DTC
recorded in Step 2.

Step 8: 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
and then recheck DTC and confirm that no DTC is
indicated.

DTC Check

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1) Prepare SUZUKI scan tool or OBD generic scan

tool.

2) Connect it to data link connector (DLC) (1) located

on underside of instrument panel at driver’s seat
side.

Special tool
(A): SUZUKI scan tool

3) Turn ignition switch ON.
4) Read DTC, according to instructions displayed on

scan tool and print them or write them down. Refer to
scan tool operator’s manual for further details.
If communication between scan tool and ECM is not
possible, check if scan tool is communicable by
connecting it to ECM in another vehicle.
If communication is possible in this case, scan tool is
in good condition. Then check data link connector
and serial data line (circuit) in the vehicle with which
communication was not possible.

5) After completing the check, turn ignition switch OFF

and disconnect scan tool from data link connector.

DTC Clearance

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NOTE
In case that DTC P0606 D6 can not be cleared
according to this procedure, clear DTC by
specified procedure described in “DTC
P0606: ECM / PCM Processor Malfunction”.

1) Connect SUZUKI scan tool to data link connector in

the same manner as when making this connection
for DTC check.

2) Turn ignition switch OFF and then ON (but engine at

stop).

3) Erase DTC according to instructions displayed on

scan tool. Refer to scan tool operator’s manual for
further details.

4) After completing the clearance, turn ignition switch

OFF and disconnect scan tool from data link
connector.

(A)

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