MARUTI SUZUKI Wagon R, Manual

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1A-1 Engine General Information and Diagnosis: Bi-Fuel LPG model
Engine
Engine General Information and Diagnosis
Bi-Fuel LPG model
Precautions
Precautions for Engine Service
AENAR90A1100001
WARNING
!
Before performing any service related to
LPG, be sure to observe “LPG Warning”: in
Section 00 to reduce the risk of fire and
personal injury.
CAUTION
!
Carefully observe the following information
on engine service in order to prevent damage
and to contribute to reliable engine
performance.
• When raising or supporting the engine for
any reason, do not apply a jack under oil
pan. Otherwise, oil pan may be damaged.
• 12-volt electrical system is capable of
damaging circuits. When performing any
work where electrical terminals could
possibly be grounded, disconnect
negative cable at battery.
• Any time the air cleaner, throttle body or
intake manifold is removed, be careful not
to admit foreign materials (like dust and
metallic particle) to engine, throttle body
and throttle valve. Otherwise, engine could
be damaged or throttle body assembly
would break down due to stuck throttle
valve.
Precautions for Diagnosing Trouble
AENAR90A1100002
ECM
• Do not disconnect ECM connectors from ECM,
battery cable from battery, ECM ground wire harness
from engine, main fuse or “DOME” fuse before
confirming diagnostic information (DTC, freeze frame
data, etc.) stored in ECM memory. Such
disconnections erase memorized information in ECM
memory.
• Check ECM for DTC by using SUZUKI scan tool when
MIL lights on.
• Diagnostic information stored in ECM memory can be
cleared as well as checked by using SUZUKI scan
tool. Before using scan tool, read its Operator’s
(Instruction) Manual to know what functions are
available and how to use it.
• Be sure to read “Precaution for CAN Communication
System”: in Section 00 before inspection and observe
what is written there.
• ECM Replacement
When ECM is replaced with new one or substituted
one, check the following conditions. Neglecting this
check may cause damage to ECM.
– Resistance value of all relays and actuators are as
specified respectively.
– TP sensor, MAP 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, combination meter and LPG
control module, is established by CAN (Controller
Area Network). (For more details of CAN
communication for ECM, refer to “CAN
Communication System Description”: in Section
10H).
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 substituted
one, make sure to register immobilizer transponder
code.
)
LPG Control Module
• Check LPG control module for DTC by using SUZUKI
scan tool when LPG warning light lights on.
• Diagnostic information stored in LPG control module
memory can be cleared as well as checked by using
SUZUKI scan tool. Before using scan tool, read its
Operator’s (Instruction) Manual to know what
functions are available and how to use it.
• Be sure to read “Precaution for CAN Communication
System”: in Section 00 before inspection and observe
what is written there.
• LPG control module replacement
When LPG control module is replaced with new one
or substituted one, check for the following conditions.
Neglecting this check may cause damage to LPG
control module.
– Resistance value of all relays and actuators are as
specified respectively.
– LPG pressure-and-temperature sensor is in good
condition and none of power circuit of this sensor is
shorted to ground.