Suzuki Grand Vitara JB627. Service manual — part 15
1A-9 Engine General Information and Diagnosis:
A/F Sensor Description
S6JB0B1101008
A/F sensor (1), in place of the conventional heated Oxygen sensor-1, is installed in the exhaust manifold (bank 1 and
bank 2) and it consists of a zirconia element (2) which causes the output current to vary according to difference in the
oxygen concentration, a heater (3) which activates the element and an adjusting resistor (4) (if equipped) which
adjusts individual difference of the sensor.
A/F sensor detects oxygen concentration in exhaust gas (9) (A/F ratio of the air-fuel mixture) linearly, ranging from
LEAN to RICH.
Operation
ECM (5) controls the sensor heater (3) and keeps the sensor element temperature at the specified level (about 750
°C) constantly so that the A/F sensor is activated in the specified way for accurate A/F detection. When the sensor
element reaches the specified temperature (it is activated), its impedance drops to the specified value (approx. 30
Ω)
by its characteristic.
When a certain voltage (about 0.4 V) is applied between sensor elements in this state, circuit current corresponding to
the sensor element impedance flows in the sensor circuit. ECM detects this circuit current and judges whether the
sensor is in the active state or not. At this time, sensor current is output linearly in the range of +0.01 mA to +some mA
on the lean side and –0.01 mA to – some mA on the rich side. The variation in these ranges depends on the difference
from the stoichiometry A/F ratio, that is, the amount of oxygen between the atmosphere side (6) and exhaust manifold
(7). According to this sensor output, ECM executes A/F feedback (fuel trim) to achieve the target A/F ratio.
The A/F sensor connector (8) is provided with an adjusting resistor (4) (if equipped) ECM detects the adjusting
resistance value and corrects the sensor output current value.
AFS-
AFRV
AFRG
AFH+
AFH-
AFS+
5V
5V
12V
1
1
3
7
8
2
6
9
10
5
11
12
13
14
15
4
I6JB0B110001-02
10. Electrode 12. CPU
14. Rich
11. A/F signal processing circuit
13. Lean
15. 0.4 V
Engine General Information and Diagnosis: 1A-10
CAN Communication System Description
S6JB0B1101009
ECM (1), ABS or ESP
® control module (2), TCM (A/T model) (3), BCM (4), 4WD control module (if equipped) (5),
combination meter (6), keyless start control module (if equipped) (7) and steering angle sensor (8) (ESP
® model) of
this vehicle communicate control data between each control module.
Communication of each control module is established by CAN (Controller Area Network) communication system.
CAN communication system uses the serial communication in which data is transmitted at a high speed. if uses a
twisted pair of two communication lines for the high-speed data transmission. As one of its characteristics, multiple
control modules can communicate simultaneously. In addition, it has a function to detect a communication error
automatically. Each module reads necessary data from the received data and transmits data. ECM communicates
control data with each control module as follows.
1
3
4
5
7
8
2
6
I6JB01110110-02
1A-11 Engine General Information and Diagnosis:
ECM Transmission Data
NOTE
In communication between ECM and combination meter, between ECM and keyless start control
module (if equipped) and between ECM and 4WD control module (if equipped), data is transmitted only
from ECM to combination meter, keyless start control module (if equipped) and 4WD control module (if
equipped). (Combination meter, keyless start control module (if equipped) and 4WD control module (if
equipped) does not transmit data to ECM.)
Engine torque signal
Accelerator pedal position
Engine speed
Throttle position
Stand by to engage air
conditioning compressor
Top gear inhibit
Torque converter clutch
control inhibit
Lock up / slip control
inhibit signal
Immobilizer indication
Engine emissions
related malfunction
Engine coolant
temperature
Fuel level percent
Cruise control signal
(if equipped)
Cruise control system
indication (if equipped)
Vehicle speed
Brake pedal switch
active
Air conditioning
compressor clutch
engaged
(if equipped with A/C)
Distance kilometers per
liter of fuel
TCM
(A/T
model)
BCM
Transmits data
of ECM
4WD
control
module
(if
equipped)
Combination
Meter
Keyless Start
Control Module
(if equipped)
ESP® Control
Module (if equipped)
ABS
Hydrauric
Unit/Control
Module
Assembly
(if equipped)
I6JB0B110002-01
Engine General Information and Diagnosis: 1A-12
ECM Reception Data
TCM
(A/T model)
BCM
ESP® Control
module (if equipped)
4WD control module
(if equipped)
Torque reduction request
Slip control signal
Transmission malfunction
indication on
Transmission emissions related
malfunction active
Transmission gear selector
position
Daytime running light active
(if equipped with DRL)
Air conditioning switch ON
(if equipped with A/C)
A/T mode status
Electric load active (low beam)
Electric load active (high beam)
Electric load active (tail light)
Electric load active (rear defogger)
Blower fan step
Torque up request
Torque request rolling count
Wheel speed pulse (rear right)
Wheel speed pulse (rear left)
Antilock brake system active
Electronic stability program
system active
Electronic stability program
system OFF
4WD shift position
ABS hydraulic
unit/control module
assmbly (if equipped)
Transmits data of ECM
I6JB0B110003-01
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