DTC SUZUKI SX4 2006 1.G Service User Guide

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• As a condition for detecting a malfunction in some
areas in the system being monitored by ECM and
turning ON the malfunction indicator lamp (1) due to
that malfunction, 2 driving cycle detection logic is
adopted to prevent erroneous detection.
• When a malfunction is detected, engine and driving
conditions then are stored in ECM memory as freeze
frame data. (For the details, refer to description on
“Freeze Frame Data: ”.)
• It is possible to communicate via DLC (3) by using not
only SUZUKI scan tool (2) but also CAN
communication OBD generic scan tool. (Diagnostic
information can be accessed by using a scan tool.)
Warm-Up Cycle
A warm-up cycle means sufficient vehicle operation such
that the coolant temperature has risen by at least 22 °C
(40 °F) from engine starting and reaches a minimum
temperature of 70 °C (160 °F).
Driving Cycle
A “Driving Cycle” consists of engine startup and engine
shutoff.2 Driving Cycle Detection Logic
The malfunction detected in the first driving cycle is
stored in ECM memory (in the form of pending DTC) but
the malfunction indicator lamp does not light at this time.
It lights up at the second detection of same malfunction
also in the next driving cycle.
Pending DTC
Pending DTC means a DTC detected and stored
temporarily at 1 driving cycle of the DTC which is
detected in the 2 driving cycle detection logic.
Freeze Frame Data
ECM stores the engine and driving conditions (in the
form of data as shown in the figure) at the moment of the
detection of a malfunction in its memory. This data is
called “Freeze frame data”.
Therefore, it is possible to know engine and driving
conditions (e.g., whether the engine was warm or not,
where the vehicle was running or stopped, where air/fuel
mixture was lean or rich) when a malfunction was
detected by checking the freeze frame data. Also, ECM
has a function to store each freeze frame data for three
different malfunctions in the order as each malfunction is
detected. Utilizing this function, it is possible to know the
order of malfunctions that have been detected. Its use is
helpful when rechecking or diagnosing a trouble.
For example
1
2 3
I5RW0C110001-01
I5RW0C110028-03

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Priority of freeze frame data:
ECM has 4 frames where the freeze frame data can be stored. The first frame stores the freeze frame data of the
malfunction which was detected first. However, the freeze frame data stored in this frame is updated according to the
priority described. (If malfunction as described in the upper square “1” is detected while the freeze frame data in the
lower square “2” has been stored, the freeze frame data “2” will be updated by the freeze frame data “1”.)
In the 2nd through the 4th frames, the freeze frame data of each malfunction is stored in the order as each malfunction
is detected. These data are not updated.
Shown in the table are examples of how freeze frame data are stored when two or more malfunctions are detected.
Freeze frame data clearance:
The freeze frame data is cleared at the same time as clearance of DTC.
Non-Euro-OBD Model
ECM diagnosis troubles which may occur in the area
including the following parts when the ignition switch is
ON and the engine is running, and indicates the result by
turning on malfunction indicator lamp (MIL) (1).
• Heated oxygen sensor-1
• Heated oxygen sensor-2
• ECT sensor
•TP sensor
• Throttle actuator
• MAF sensor
• IAT sensor
• CMP sensor
• CKP sensor
• Knock sensor
• Wheel speed sensor
• CPU (Central Processing Unit) of ECM
• APP sensor
• Oil control valve (VVT model)
• Barometric pressure sensor
• A/C refrigerant pressure sensor
• ECM backup power supply
• Fuel level sensor
•CANECM and MIL operate as follows.
• MIL lights when the ignition switch is turned ON (but
the engine at stop) with the diagnosis switch terminal
ungrounded regardless of the condition of Engine and
Emission control system. This is only to check MIL in
the combination meter and its circuit.
• If the above areas of Engine and Emission control
system is free from any trouble after the engine start
(while engine is running), MIL turns OFF.
• When ECM detects a trouble which has occurred in
the above areas, it makes MIL turn ON while the
engine is running to warn the driver of such
occurrence of trouble and at the same time it stores
the trouble area in ECM back-up memory. (The
memory is kept as it is even if the trouble was only
temporary and disappeared immediately. And it is not
erased unless the power to ECM is shut off for
specified time or it is cleared by SUZUKI scan tool
(SUZUKI-SDT) (2).)
For further detail of the checking / clearing procedure,
refer to “DTC Check” or “DTC Clearance”. Priority Freeze frame data in frame 1
1Freeze frame data at initial detection of malfunction among misfire detected (P0300 – P0304), fuel
system too lean (P0171) and fuel system too rich (P0172)
2 Freeze frame data when a malfunction other than those in “1” is detected
Malfunction detected orderFrame
Frame 1 Frame 2 Frame 3 Frame 4
Freeze frame data to
be updated1st freeze frame
data2nd freeze frame
data3rd freeze frame
data
No malfunction No freeze frame data
1P0401 (EGR)
detectedData at P0401
detectionData at P0401
detection——
2P0171 (Fuel system)
detectedData at P0171
detectionData at P0401
detectionData at P0171
detection—
3P0300 (Misfire)
detectedData at P0171
detectionData at P0401
detectionData at P0171
detectionData at P0300
detection
4P0301 (Misfire)
detectedData at P0171
detectionData at P0401
detectionData at P0171
detectionData at P0300
detection

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For information about the following items, refer to “Euro
OBD model: ”.
• Warm-up cycle
• Driving cycle
• 2 driving cycle detection logic
• Pending DTC
Data Link Connector (DLC)S6RW0D1101011
NOTE
There are two types of OBD system
depending on the vehicle specification.
For identification, refer to “Precaution on On-
Board Diagnostic (OBD) System”.

DLC (1) is in compliance with SAE J1962 in the shape of
connector and pin assignment.
OBD CAN Hi line (6) and Low line (3) (CAN line of ISO
15765-4) are used for SUZUKI scan tool (SUZUKI-SDT)
(7) or CAN communication OBD generic scan tool to
communicate with ECM (included in immobilizer control)
and TCM (Transmission Control Module) (for A/T
model).
Engine and Emission Control System
Description
S6RW0D1101004
The engine and emission control system is divided into 4
major sub-systems: air intake system, fuel delivery
system, electronic control system and emission control
system.
Air intake system includes air cleaner, throttle body and
intake manifold.
Fuel delivery system includes fuel pump, delivery pipe,
etc.
Electronic control system includes ECM, various sensors
and controlled devices.
Emission control system includes EGR, EVAP and PCV
system.
3. DLC
1
2 3
I5RW0C110001-01
2. B + (Unswitched vehicle battery positive)
4. ECM ground (Signal ground)
5. Vehicle body ground (Chassis ground)
2
45 6
1
9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8
7
3
1I7RW01110092-01

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Diagnostic Information and Procedures
Engine and Emission Control System CheckS6RW0D1104001
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”, and go to
St ep 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”.
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”.
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”
and “Engine Symptom Diagnosis”.
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.

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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

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Step 2: DTC / Freeze Frame Data Check, Record and
Clearance
First, check DTC (including pending DTC), referring to
“DTC Check”. If DTC is indicated, print it and freeze
frame data or write them down and then clear them by
referring to “DTC Clearance”. 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”.
Step 5: Trouble Symptom Confirmation
Based on information obtained in “Step 1: Customer
Complaint Analysis: ” and “Step 2: DTC / Freeze Frame
Data Check, Record and Clearance: ”, 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 checking procedure.
Step 8: Engine Basic Inspection and Engine
Symptom Diagnosis
Perform basic engine check according to “Engine Basic
Inspection” 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”
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) CheckS6RW0D1104002
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
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”.
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 troubleshooting.
DTC CheckS6RW0D1104085
NOTE
• There are two types of OBD system
depending on the vehicle specification.
For identification, refer to “Precaution on
On-Board Diagnostic (OBD) System”.
1
I4RS0A110012-01

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• The MIL is turned on when the ECM and/or
TCM detect malfunction(s). Each ECM and
TCM stores diagnostic information as the
diagnostic trouble code (DTC) in its
memory and outputs the DTC to the scan
tool.
Therefore, check both of the ECM and TCM
for any DTC with the scan tool because the
DTC stored in ECM and TCM is not read
and displayed at a time. However, each of
the ECM and TCM needs not to be checked
with the generic scan tool because the
DTC stored in ECM and TCM is read and
displayed at a time.

1) Prepare CAN communication OBD generic scan tool
or SUZUKI scan tool.
Special tool
(A): SUZUKI scan tool (SUZUKI-SDT)
2) With ignition switch OFF, connect it to DLC (1)
located on underside of instrument panel at driver’s
seat side.
3) Turn ignition switch ON and confirm that MIL lights.
4) Read DTC and freeze frame data according to
instructions displayed on scan tool and print them or
write them down. Refer to scan tool operator’s
manual for details.
If communication between scan tool and ECM is not
possible, go to “Troubleshooting for Communication
Error with Scan Tool Using CAN”.
5) After completing the check, turn ignition switch off
and disconnect scan tool from DLC.
DTC ClearanceS6RW0D1104004
NOTE
There are two types of OBD system
depending on the vehicle specification.
For identification, refer to “Precaution on On-
Board Diagnostic (OBD) System”.

1) Connect SUZUKI scan tool or CAN communication
OBD generic 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.
3) Erase DTC and pending DTC according to
instructions displayed on scan tool. Freeze frame
data is cleared with the DTC. Refer to scan tool
operator’s manual for further details.
If communication between scan tool and ECM is not
possible, go to “Troubleshooting for Communication
Error with Scan Tool Using CAN”.
4) After completing the clearance, turn ignition switch
OFF and disconnect scan tool from data link
connector.
NOTE
DTC and freeze frame data stored in ECM
memory are also cleared in the following
cases. Be careful not to clear them before
keeping their record.
• When power to ECM is cut off (by
disconnecting battery cable, removing
fuse or disconnecting ECM connectors).
• When the same malfunction (DTC) is not
detected again during 40 engine warm-up
cycles. (See “Warm-Up Cycle” of “On-
Board Diagnostic System Description”.)

Troubleshooting for Communication Error with
Scan Tool Using CAN
S6RW0D1104083
Perform this troubleshooting when it is not possible to
communicate between scan tool and ECM/TCM.
NOTE
• When performing this troubleshooting, be
sure to have full understanding of
“Precaution on CAN Troubleshooting” and
observe it.
• It may be possible that CAN system has
trouble because of fuse blown or low
battery voltage. Before troubleshooting,
check to make sure that fuse, battery
voltage and generator status are normal.
• When disconnecting each control module
connector in this troubleshooting, various
DTCs will be detected. Be sure to clear
DTCs in the following control modules
after completing this troubleshooting.
–ECM
–BCM
–TCM
– Keyless start control module
– 4WD control module
– HVAC control module (Auto A/C model)
– P/S control module

(A) 1I5RW0C110011-01

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Troubleshooting
Step Action Yes No
1Scan tool check
1) Disconnect scan tool from DLC with ignition switch
turned OFF.
2) Check for proper connection to all terminals of scan tool
connector.
3) If OK, connect scan tool to another vehicle of this type
with ignition switch turned OFF.
4) Check communication between scan tool and ECM by
DTC check in ECM.
Is it possible to check DTC in ECM?Go to Step 2. Scan tool faulty. Refer
to its operator’s manual.
2DLC power circuit check
1) Check for proper connection to all DLC (1) terminals with
ignition switch turned OFF.
2) If OK, measure voltage between +B terminal (2) of DLC
and vehicle body ground with ignition switch turned to
ON position.
Is voltage 10 – 14 V?Go to Step 3. Repair power circuit.
3DLC ground circuit check
1) Ignition switch turn to OFF position.
2) Check DLC (1) ground circuits as follows.
• Measure resistance between signal ground terminal
(2) of DLC and vehicle body ground.
• Measure resistance between body ground terminal (3)
of DLC and vehicle body ground.
Is resistance 1
Ω or less?Go to Step 4. Repair ground circuit(s).
4DTC Check
1) Turn ignition switch to OFF position.
2) Connect scan tool to DLC.
3) Check DTC in the following control modules that
communicate with scan tool by K-line.
•BCM
• Keyless start control module
• 4WD control module
Is there any DTC other than CAN-DTC?Go to applicable
troubleshooting of DTC
other than CAN-DTC.Go to Step 5.
2
9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8
1
I7RW01110096-01
23 1
9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8
I7RW01110097-01

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5CAN line check between DLC and BCM
1) Turn ignition switch to OFF position.
2) Disconnect BCM connector from BCM.
3) Check for proper connection to all terminals of BCM
connector.
4) If OK, check CAN lines between DLC and BCM
connector for open, short to power circuit, short to
ground circuit, short to other CAN line and high
resistance.
Are CAN lines between DLC and BCM connector in good
condition?Go to Step 6. Repair CAN line.
6Control module connector check
1) Turn ignition switch to OFF position.
2) Disconnect all the following control module connectors.
• Control modules communicated by CAN
–ECM
–TCM
– ABS control module
–BCM
– Combination meter
– Keyless start control module
– 4WD control module
3) Check for proper connection to each CAN line terminal
of all control module (communicated by CAN)
connectors.
4) If OK, connect connectors of all control module/sensor
communicated by CAN securely.
5) Check communication between scan tool and ECM/TCM
by DTC check in ECM/TCM.
Is it possible to check DTC in ECM and TCM?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.Go to Step 7.
7CAN line check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control module
communicated by CAN.
3) Check all the following CAN lines for open, short to
power circuit, short to ground circuit, short to other CAN
line and high resistance.
• Between BCM connector and ABS control module
connector
• Between ABS control module connector and ECM
connector
• Between ECM connector and TCM connector
• Between BCM connector and keyless start control
module connector
• Between combination meter connector and 4WD
control module connector
• Between BCM connector and combination meter
connector
Are all CAN lines in good condition?Go to Step 8. Repair CAN line. Step Action Yes No

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8Communication check between scan tool and ECM
1) Turn ignition switch to OFF position.
2) Connect ECM, BCM, ABS control module and
combination meter connectors.
3) Check communication between scan tool and ECM by
DTC check in ECM.
Is it possible to check DTC in ECM?A/T model: Go to Step
9.
M/T model: Substitute a
known-good ECM and
recheck.Go to Step 4 through
Step 11 of
“Troubleshooting for
CAN-DTC”.
9Communication check between scan tool and TCM
1) Turn ignition switch to OFF position.
2) Connect TCM connectors.
3) Check communication between scan tool and TCM by
DTC check in TCM.
Is it possible to check DTC in TCM?Identify malfunction
control module by
performing Step 13
through Step 14 of
“Troubleshooting for
CAN-DTC”.Go to Step 10.
10Internal circuit check in ECM
1) Turn ignition switch to OFF position and then disconnect
negative (–) cable at battery.
2) Disconnect TCM connectors.
3) Measure resistance between the followings
• Between CAN High terminal on DLC and “C06-17”
terminal on TCM connector
• Between CAN Low terminal on DLC and “C06-7”
terminal on TCM connector
Is each resistance 0 – 1
Ω?Substitute a known-
good TCM and recheck.Substitute a known-
good ECM and recheck. Step Action Yes No