Suzuki 2006 SX4, Service Manual

Page: 46 / 1478

1A-2 Engine General Information and Diagnosis:
• Therefore, check both ECM and TCM 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.
– CAN communication OBD generic scan tool
displays DTC detected by each of ECM and TCM
simultaneously.
• Priorities for diagnosing troubles
If two or more diagnostic trouble codes (DTCs) are
stored, proceed to the flow of the DTC which has
detected earliest in the order and follow the instruction
in that table.
If no instructions are given, DTCs according to the
following priorities.
a. Diagnostic trouble codes (DTCs) other than DTC
P0171 / P0172 (Fuel system too lean/too rich) and
DTC P0300 / P0301 / P0302 / P0303 / P0304
(Misfire detected)
b. DTC P0171 / P0172 (Fuel system too lean/too
rich)
c. DTC P0300 / P0301 / P0302 / P0303 / P0304
(Misfire detected)
• Be sure to read “Precaution for CAN Communication
System 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 known good ECM.
– Resistance value of all relays, actuators is as
specified respectively.
– APP sensor, TP sensor and A/C refrigerant
pressure 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, ABS / control module,
4WD control module and TCM, is established by CAN
(Controller Area Network). (For more detail of CAN
communication for ECM, refer to “CAN
Communication System Description”). Therefore,
handle CAN communication line with care referring to
“Precaution for CAN Communication System in
Section 00”.
• Immobilizer transponder code registration after
replacing ECM (Immobilizer model)
When ECM is replaced with new one or with another
one, make sure to register immobilizer transponder
code to ECM correctly according to “Procedure after
ECM Replacement in Section 10C”.
Precautions for DTC Troubleshooting
S6RW0C1100005
• Before performed trouble shooting, be sure to read
the “Precautions of ECM Circuit Inspection”.
• 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”.
• Upon completion of inspection and repair work,
perform “DTC Confirmation Procedure” and confirm
that the trouble has been corrected.
Precautions of ECM Circuit Inspection
S6RW0C1100006
• 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 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
S6RW0C1100007
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 the procedure to
register such data in ECM, refer to “Electric Throttle
Body System Calibration in Section 1C”.
• To shut off backup power of ECM for such purposes of
battery replacement or “DOME” fuse removal.
• To erase DTCs P0607, P0122, P0123, P0222, P0223,
P2101, P2102, P2103, P2111, P2119, P2122, P2123,
P2127, P2128, P2135 and/or P2138.
• To replace ECM.
• To replace throttle body and/or APP sensor assembly.