Suzuki GA413, Service Manual

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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.
Pending DTC
Pending DTC means a DTC detected and stored temporarily at 1
driving cycle of the DTC which is detected in the 2 driving cycle
detection logic.
Freeze Frame Data
ECM stores the engine and driving conditions (in the from of data
as shown at the left) at the moment of the detection of a malfunction
in its memory. This data is called “Freeze frame data”.
Therefore, it is possible to know engine and driving conditions
(e.g., whether the engine was warm or not, where the vehicle was
running or stopped, where air / fuel mixture was lean or rich) when
a malfunction was detected by checking the freeze frame data.
Also, ECM has a function to store each freeze frame data for three
different malfunctions in the order as the malfunction is detected.
Utilizing this function, it is possible to know the order of malfunc-
tions that have been detected. Its use is helpful when rechecking
or diagnosing a trouble.
Priority of freeze frame data:
ECM has 4 frames where the freeze frame data can be stored. The
first frame stores the freeze frame data of the malfunction which
was detected first. However, the freeze frame data stored in this
frame is updated according to the priority described below. (If mal-
function as described in the upper square “1” below is detected
while the freeze frame data in the lower square “2” has been stored,
the freeze frame data “2” will be updated by the freeze frame data
“1”.)
An Example of Freeze Frame Data
1. Trouble Code P0102 (1st)
2. Engine Speed 782 RPM
3. Eng Cool Tmp. 80
_
C
4. Vehicle Spd. 0 km/h
5. MAP Sensor 39 kPa
6. St. Term FT1 – 0.8% Lean
7. Lg. Term FT1 – 1.6% Lean
8. Fuel 1 Stat. Closed Loop
9. Fuel 2 Stat. Not used
10. Load value 25.5%
1st, 2nd or 3rd in parentheses here represents
which position in the order the malfunction is detected.
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-7
GA413
supple
PRIORITY FREEZE FRAME DATA IN FRAME 1
1
Freeze frame data at initial detection of malfunction
among misfire detected (P0300-P0304), fuel system
too lean (P0171) and fuel system too rich (P0172)
2
Freeze frame data when a malfunction other than
those in “1” above is detected