Suzuki GRAND VITARA XL-7 Owner's Manual page 169

6-1-8 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
Priority of Freeze Frame Data
ECM (PCM) 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 malfunction 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".)
PRIORITY
Freeze frame data at initial detection of malfunction among misfire detected (P0300-P0306), fuel
1
system too lean (P0171, P0174) and fuel system too rich (P0172, P0175)
2 Freeze frame data when a malfunction other than those in "1" above is detected
In the 2nd through the 4th frames, the freeze frame data of each malfunction is stored in the order as the mal-
function is detected. These data are not updated regardless of the priority.
Shown in the table below are examples of how freeze frame data are stored when two or more malfunctions are
detected.
No malfunction
P0110 (IAT)
1
detected
P0171 (Fuel sys-
2
tem) detected
P0300 (Misfire)
3
detected
P0301 (Misfire)
4
detected
Freeze Frame Data Clearance
The freeze frame data is cleared at the same time as clearance of DTC.
FREEZE FRAME DATA IN FRAME 1
FRAME 1
FREEZE FRAME
DATA to be updated
No freeze frame
No freeze frame data
data
Data at P0110 Data at P0110
detection detection
Data at P0171 Data at P0110
detection detection
Data at P0171 Data at P0110
detection detection
Data at P0171 Data at P0110
detection detection
DATA LINK CONNECTOR (DLC)
DLC (1) is in compliance with SAEJ1962 in its installation posi-
tion, the shape of connector and pin assignment.
K line of ISO 9141 is used for SUZUKI scan tool or generic scan
tool to communicate with ECM (PCM), ABS control module and
Air bag SDM. SUZUKI serial data line is used for SUZUKI scan
tool to communicate with Immobilizer control module.
2. B+
3. SUZUKI Serial data line
4. K line of ISO 9141
5. Body ground
6. ECM ground
FRAME 2 FRAME 3
1st FREEZE 2nd FREEZE
FRAME DATA FRAME DATA
No freeze frame
data
No freeze frame
data
Data at P0171
detection
Data at P0171
detection
Data at P0171
detection
FRAME 4
3rd FREEZE
FRAME DATA
No freeze frame
data
No freeze frame
data
No freeze frame
data
Data at P0300
detection
Data at P0300
detection