Engine Diagnosis; General Description; On-Board Diagnostic System - Suzuki Swift User Manual

6-6 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)

GENERAL DESCRIPTION

This vehicle is equipped with an engine and emission control system which are under control of ECM (PCM).
The engine and emission control system in this vehicle are controlled by ECM (PCM). ECM (PCM) 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" and each item in "Precaution in Diagnosing Trouble" and execute diagnosis ac-
cording to "ENGINE DIAGNOSTIC FLOW TABLE".
There is a close relationship between the engine mechanical, engine cooling system, ignition system, exhaust sys-
tem, 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.

ENGINE DIAGNOSIS

ON-BOARD DIAGNOSTIC SYSTEM

ECM (PCM) in this vehicle has following functions.
D When the ignition switch is turned ON with the engine at a stop,
malfunction indicator lamp (MIL) (1) turns ON to check the bulb
of the malfunction indicator lamp (1).
D When ECM (PCM) 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 instru-
ment panel turn ON or flash (flashing only when detecting a mis-
fire which can cause damage to the catalyst) and stores the mal-
function area in its memory.
(If it detects that continuously 3 driving cycles are normal after de-
tecting a malfunction, however, it makes MIL (1) turn OFF al-
though DTC stored in its memory will remain.)
D As a condition for detecting a malfunction in some areas in the
system being monitored by ECM (PCM) and turning ON the mal-
function indicator lamp (1) due to that malfunction, 2 driving cycle
detection logic is adopted to prevent erroneous detection.
D When a malfunction is detected, engine and driving conditions
then are stored in ECM (PCM) memory as freeze frame data. (For
the details, refer to description on Freeze frame data.)
D It is possible to communicate by using not only SUZUKI scan tool
(Tech-1) (2) but also generic scan tool. (Diagnostic information
can be accessed by using a scan tool.)