The following information on engine service
should be noted carefully, as it is important in
preventing damage, and in contributing to
reliable engine performance.

• When raising or supporting engine for any reason, do

not use a jack under oil pan. Due to small clearance
between oil pan and oil pump strainer, jacking against
oil pan may cause it to be bent against strainer,
resulting in damaged oil pick-up unit.

• It should be kept in mind, while working on engine,

that 12-volt electrical system is capable of violent and
damaging short circuits.
When performing any work where electrical terminals
can be grounded, ground cable of the battery should
be disconnected at battery.

• Any time the air cleaner, throttle body or intake

manifold is removed, the intake opening should be
covered. This will protect against accidental entrance
of foreign material which could follow intake passage
into cylinder and cause extensive damage when
engine is started.

Precautions in Diagnosing Trouble

S6JB0A1110002

• Don’t disconnect couplers from ECM, battery cable

from battery, ECM ground wire harness from engine
or main fuse before confirming diagnostic information
(DTC, freeze frame data, etc.) stored in ECM memory.
Such disconnection will erase memorized information
in ECM memory.

• Diagnostic information stored in ECM memory can be

cleared as well as checked by using SUZUKI scan
tool or OBD generic scan tool (Euro OBD model).
Before using scan tool, read its Operator’s
(Instruction) Manual carefully to have good
understanding as to what functions are available and
how to use it.
It is indistinguishable which module turns on MIL
because not only ECM but also TCM (for A/T model)
turns on MIL (For details of on-board diagnostic
system for A/T model, refer to “On-Board Diagnostic
System Description in Section 5A”. Therefore, check
both ECM and TCM (for A/T model) for DTC when
MIL lights on.
When checking ECM for DTC, keep in mind that DTC
is displayed on the scan tool as follows depending on
the scan tool used.
– SUZUKI scan tool displays DTC detected by ECM.
– OBD generic scan tool displays DTC detected by

each of ECM and TCM (for A/T model)
simultaneously.

• Priorities for diagnosing troubles

If two or more DTCs are stored, proceed to the DTC
flow which has been detected earliest in the order and
follow the instruction in that flow.
If no instructions are given, troubleshoot DTCs
according to the following priorities.
a. DTCs other than DTC P0171 / P0172 (Fuel

system too lean / too rich), DTC P0300 / P0301 /
P0302 / P0303 / P0304 (Misfire detected) and
DTC P0401 / P0402 (EGR flow malfunction)

b. DTC P0171 / P0172 (Fuel system too lean / too

rich) and DTC P0401 / P0402 (EGR flow
malfunction)

c. DTC P0300 / P0301 / P0302 / P0303 / P0304

(Misfire detected)

Engine General Information and Diagnosis: For Petrol Engine Model 1A-2

• Be sure to read “Precautions for Electrical Circuit

Service in Section 00” before inspection and observe
what is written there.

• ECM replacement:

When substituting a known-good ECM, check for the
following conditions. Neglecting this check may cause
damage to a known-good ECM.
– Resistance value of all relays and actuators is as

specified respectively.

– MAP sensor, electric load current sensor (for J20

engine), A/C refrigerant pressure sensor (if
equipped with A/C), accelerator pedal position
(APP) sensor, TP sensor and CO adjust resistor (if
not equipped with A/F sensor) are in good condition
and none of power circuits of these sensors is
shorted to ground.

• Communication of ECM, BCM, combination meter,

keyless start control module (if equipped), ABS /
ESP

® control module, 4WD control module (if

equipped), steering angle sensor (if equipped) and
TCM (for A/T model) is established by CAN
(Controller Area Network). (For more detail of CAN
communication for ECM, refer to “CAN
Communication System Description: For Petrol
Engine Model”). Therefore, handle CAN
communication line with care referring to “Precaution
for CAN Communication System in Section 00”.

• Immobilizer transponder code registration after

replacing ECM:
When ECM is replaced with new one or with another
one, make sure to register immobilizer transponder
code with ECM correctly according to “Procedure after
ECM Replacement: For Petrol Engine Model in
Section 10C”.

Precautions for DTC Troubleshooting

S6JB0A1110003

• Before troubleshooting, be sure to read the

“Precautions of ECM Circuit Inspection: For Petrol
Engine Model”.

• When measuring circuit voltage, resistance and/or

pulse signal at ECM connector, connect the special
tool to ECM and/or the ECM connectors referring to
“Inspection of ECM and Its Circuits: For Petrol Engine
Model”.

• Upon completion of inspection and repair work,

perform “DTC Confirmation Procedure” and confirm
that the trouble has been corrected.

Precautions of ECM Circuit Inspection

S6JB0A1110004

• ECM connectors are waterproofed. Each terminal of

the ECM connectors is sealed up with the grommet.
Therefore, when measuring circuit voltage, resistance
and/or pulse signal at ECM connector, do not insert
the tester’s probe into the sealed terminal at the
harness side. When measuring circuit voltage,
resistance and/or pulse signal at ECM connector,
connect the special tool to the ECM connectors. And,
insert the tester’s probe into the special tool’s
connectors at the harness side, and then measure
voltage, resistance and/or pulse signal. Or, ECM and
its circuits may be damaged by water.

• Wire colors of the special tool’s connectors are

different from the ones of the ECM connectors.
However, the circuit arrangement of the special tool’s
connectors is the same as the one of the ECM
connectors. Therefore, measure circuit voltage and
resistance by identifying the terminal location subject
to the measurement.

Precautions of Electric Throttle Body System
Calibration

S6JB0A1110005

After performing one of works described below, it is
necessary to re-register the completely closed throttle
valve reference position stored in memory of ECM. (For
detailed information, refer to “Description of Electric
Throttle Body System Calibration: For Petrol Engine
Model”.) For the procedure to register such data in ECM,
refer to “Electric Throttle Body System Calibration: For
Petrol Engine Model in Section 1C”.
• To shut off backup power of ECM for such purposes of

battery replacement or “DOME” fuse removal

• To erase DTCs P0122, P0123, P0222, P0223, P0607,

P2101, P2102, P2103, P2111, P2119, P2122, P2123,
P2127, P2128, P2135 and/or P2138

• To replace ECM
• To replace throttle body and/or accelerator pedal

position (APP) sensor assembly

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