Suzuki 2000 Grand Vitara SQ625 Service Manual page 121

6-1-10 ENGINE (H25 ENGINE)
An Example of Freeze Frame Data
1. TROUBLE CODE
2. COOLANT TEMP.
3. ENGINE SPEED
4. SHORT FT B1
5. SHORT FT B2
6. LONG FT B1
7. LONG FT B2
8. CALC LOAD
9. FUEL SYSTEM B1
10. FUEL SYSTEM B2
11. MAP
12. VEHICLE SPEED
1st, 2nd or 3rd in parentheses here repre-
sents which position in the order the malfunc-
tion is detected.
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 and engine shutoff.
2 Driving Cycles Detection Logic
The malfunction detected in the first driving cycle is stored in ECM
(PCM) 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 driv-
ing 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 cycles
detection logic.
Freeze Frame Data
ECM (PCM) stores the engine and driving conditions (in the form
of data as shown at the left) at the moment of the detection of a mal-
function 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 malfunc-
tion was detected by checking the freeze frame data. Also, ECM
P0102 (1st)
(PCM) has a function to store each freeze frame data for three dif-
ferent malfunctions in the order as the malfunction is detected. Uti-
80_C
lizing this function, it is possible to know the order of malfunctions
750 RPM
that have been detected. Its use is helpful when rechecking or diag-
– 0.8 %
nosing a trouble.
– 0.1 %
Priority of freeze frame data:
– 1.3 %
ECM (PCM) has 4 frames where the freeze frame data can be
– 1.5 %
stored. The first frame stores the freeze frame data of the malfunc-
tion which was detected first. However, the freeze frame data
20.5 %
stored in this frame is updated according to the priority described
CLOSED
below. (If malfunction as described in the upper square "1" below
CLOSED
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
30.6 kPa
frame data "1".)
0 km / h
PRIORITY FREEZE FRAME DATA IN FRAME 1
Freeze frame data at initial detection of malfunction
among misfire detected (P0300-P0306), fuel sys-
1
tem too lean (P0171, P0174) and fuel system too
rich (P0172, P0175).
Freeze frame data when a malfunction other than
2
those in "1" above is detected.