Engine Diagnosis General Description; On-Board Diagnostic System Description - Suzuki Liana RH413 Service Manual

Failure to disconnect cables may result in damage to
wire harness or other electrical parts.
• Throughout this manual, the four cylinders of the
engine are identified by numbers; No.1 (1), No.2 (2),
No.3 (3) and No.4 (4) counted from crankshaft pulley
side to flywheel side.
1

Engine Diagnosis General Description

This vehicle is equipped with an engine and emission
control system which are under control of ECM.
The engine and emission control system in this vehicle
are controlled by ECM. ECM has an On-Board
Diagnostic system which detects a malfunction in this
system and abnormality of those parts that influence the
engine exhaust emission. When diagnosing engine
troubles, be sure to have full understanding of the outline
of "On-Board Diagnostic System Description" and each
item in "Precautions in Diagnosing Trouble" and execute
diagnosis according to "Engine and Emission Control
System Check".
There is a close relationship between the engine
mechanical, engine cooling system, ignition system,
exhaust system, etc. and the engine and emission
control system in their structure and operation. In case of
an engine trouble, even when the malfunction indicator
lamp (MIL) doesn't turn ON, it should be diagnosed
according to this flow table.

On-Board Diagnostic System Description

Vehicle with Immobilizer Indicator Lamp
ECM in this vehicle has the following functions.
• When the ignition switch is turned ON with the engine
at a stop, malfunction indicator lamp (MIL) (1) turns
ON to check the circuit of the malfunction indicator
lamp (1).
• When ECM detects a malfunction which gives an
adverse effect to vehicle emission while the engine is
running, it makes the malfunction indicator lamp (1) in
the meter cluster of the instrument panel turn ON or
flash (flashing only when detecting a misfire which
can cause damage to the catalyst) and stores the
malfunction area in its memory.
(If it detects that continuously 3 driving cycles are
normal after detecting a malfunction, however, it
makes MIL (1) turn OFF although DTC stored in its
memory will remain.)
2
3
4
I2RH0B110001-01
S3RH0A1101002
S3RH0A1101003
Engine General Information and Diagnosis:
• 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 by using not only
SUZUKI scan tool (2) but also generic scan tool.
(Diagnostic information can be accessed by using a
scan tool.)
1
4
3. Immobilizer indicator lamp
4. Data link connector (DLC)
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, driving
mode where a malfunction would be detected if present,
and engine shutoff.
2 driving cycles detection logic
The malfunction detected in the first driving cycle is
stored in ECM memory (in the form of pending DTC and
freeze frame data) 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.
1A-2
3
2
I3RH0A110001-01