2000 SUZUKI SWIFT SF310 Service Workshop Manual

7B-6 AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC)
[G13 Engine Model]
1. PCM
2. Camshaft position (CMP) sensor
3. Throttle position (TP) sensor
4. Engine coolant temperature (ECT) sensor
5. Transmission range sensor (shift switch)
6. Output shaft speed sensor (A / T VSS)7. Malfunction indicator lamp (MIL)
8. Data link connector (DLC)
9. Shift solenoid-A
(No.1, Direct clutch solenoid valve)
10. Shift solenoid-B
(No.2, 2nd brake solenoid valve)11. Ignition switch
12. Main relay
13. Inhibitor switch
14. To starter
15. Terminal arrangement of PCM coupler
(Viewed from harness side)

1. PCM
2. Instrument panel
TP sensor
Transmission range sensor
Output shaft speed sensor
(A / T VSS)
Shift solenoid-B
(2nd brake solenoid valve)
Shift solenoid-A
(Direct clutch solenoid valve)PCM
1. Throttle position sensor
2. Throttle body
A: Ground
3. Ground terminal
4. Reference voltage
terminal
5. Output voltage terminal
6. TP sensor
C: Output voltage
(opening angle signal)
D: Power supply from ECM
(reference voltage)
[G10 engine model]
[G13 engine model]
AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC) 7B-7
POWERTRAIN CONTROL MODULE (PCM)
The powertrain control module controls the shift solenoid B (2nd
brake solenoid valve) and the shift solenoid A (direct clutch sole-
noid valve) by sending electric signals to them so as to attain auto-
matic gear shift between the 1st and 2nd gears, and the 2nd and
3rd gears. Equipped as PCM sensed parameters are the throttle
position sensor, transmission range switch and vehicle speed sen-
sor. These switch and sensors sense the throttle valve opening, se-
lector lever’s position and vehicle speed, and send those signals to
the powertrain control module. Then, the powertrain control module
opens and closes valves of the above solenoids according to these
signals. The powertrain control module is installed to the underside
of the instrument panel at the driver’s seat side.
GEAR SHIFT CONTROL SYSTEM
THROTTLE POSITION SENSOR (TP sensor)
The throttle position sensor consisting of a potentiometer is con-
nected to the throttle valve shaft.
Throttle valve opening signal (output voltage) is transmitted from
throttle position sensor to PCM as voltage signal. PCM uses it as
one of the signals to control transmission gear shift.

1. Transmission range sensor
2. Select cable
1. Transmission
2. Shift solenoid-B
(No.2, 2nd brake solenoid valve)
3. Shift solenoid-A
(No.1, direct clutch solenoid valve)
4. Oil strainer
7B-8 AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC)
TRANSMISSION RANGE SENSOR (SHIFT SWITCH)
Being linked with the selector lever, this sensor changes selector
lever positions into electric signals and send them to the engine
control module. The contact points of this sensor for P and N ranges
are also connected with the starting motor circuit.
So when the selector lever is shifted to the P or N range position,
the contact points for P or N range are connected and cause the
starting motor to operate by turning the starter switch ON.
When the selector lever is in any other position than P and N
ranges, the sensor remains OFF and therefore the starting motor
cannot be operated, that is, the engine cannot be started.
Also, as its contact point for R range is connected with the backup
lamp circuit, only when the selector lever is shifted to R range, the
contact point contacts to light the backup lamp.
DIRECT CLUTCH AND 2ND BRAKE SOLENOID
VALVES
These solenoid valves are mounted on the valve body. They are
turned ON and OFF by the signals from the engine control module
and actuate each shift valve (1 – 2 and 2 – 3 valves) so as to control
transmission gear shift.
Shift solenoid-B (2nd brake solenoid valve) operates 1 – 2 shift
valve, and shift solenoid-A (direct clutch solenoid valve) does 2 –
3 shift valve.
OPERATION OF DIRECT CLUTCH AND 2ND BRAKE SOLENOIDS
RangeD2LP, N & R
Gear1st2nd3rd1st2nd1st(2nd)–
Shift solenoid-A (No.1)
(Direct clutch solenoid valve)





Shift solenoid-B (No.2)
(2nd brake solenoid valve)





: Operated (Solenoid Valve is Open)
: Unoperated (Solenoid Valve is Closed)

1. Countershaft gear
2. Output shaft speed sensor
A: Magnetic core end
D or 2
1→2
18
11
52
33D
2→3
33
21
97
613→2
14
9
82
51D or 2
2→1
14
9
37
23L
2→1
37
23
37
23 Full close
Full openkm / h
mile/h
km / h
mile/h Throttle SpeedGear Selector
VEHICLE SPEED
UpshiftDownshift
THROTTLE VALVE OPENING
[G10 Engine Model]
AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC) 7B-9
OUTPUT SHAFT SPEED SENSOR (A / T VSS)
The output shaft speed sensor consists of a magnetic core with
magnet and coil. It is mounted on transmission case with 0.6 mm
(0.024 in.) air gap between the core end and countershaft gear
tooth.
While the countershaft rotates, magnetic flux is cut by gear tooth
thus a pulse is generated in the sensor coil according to the speed.
And then, the pulse is transmitted to engine control module as
speed signal.
AUTOMATIC SHIFT DIAGRAM
Automatic shift schedule as a result of shift control is shown below. In case that selector lever is shifted to L range
at a higher than 37 km / h (23 mile / h) (G10 engine model), 40 km / h (25 mile / h) (G13 engine model) speed, 2nd
gear is operated and then down shifts to 1st at a speed lower than that. No up shift is available in L range.

7B-10 AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC)
D or 2
1→2
18
11
58
36D
2→3
30
19
11 0
693→2
14
9
97
61D or 2
2→1
14
9
40
25L
2→1
40
25
40
25 Full close
Full openkm / h
mile/h
km / h
mile/h Throttle SpeedGear Selector
VEHICLE SPEED
Upshift
Downshift
THROTTLE VALVE OPENING
[G13 Engine Model]

1. Malfunction indicator lamp (MIL)
2. Data link connector (DLC)
3. SUZUKI scan tool (Tech-1)
AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC) 7B-11
DIAGNOSIS
This vehicle is equipped with an electronic transmission control system, which control the automatic shift up and
shift down timing, etc. suitably to vehicle driving conditions.
PCM (ECM) has an On-Board Diagnosis System which detects a malfunction in this system and abnormality of
those parts that influence the engine exhaust emission.
When diagnosing a trouble in transmission including this system, 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 according to “AUTOMATIC TRANSMISSION DIAGNOSTIC FLOW TABLE” given below to ob-
tain correct result smoothly.
ON-BOARD DIAGNOSTIC SYSTEM
For automatic transmission control system, PCM (ECM) has follow-
ing functions. Refer to Section 6 or 6-1 for details.

When ignition switch is turned ON with engine at a stop malfunc-
tion indicator lamp (MIL) turns ON to check bulb of MIL.

When PCM detects a malfunction in A / T control system (and / or
a malfunction which gives an adverse effect to vehicle emission)
while engine is running, it makes malfunction indicator lamp in
meter cluster of instrument panel turn ON and stores malfunction
area (DTC) in its memory.
If it detects that continuously 3 driving cycles are normal after de-
tecting a malfunction, however, it makes MIL turn OFF although
DTC stored in its memory will remain.

It is possible to communicate with PCM through data link connect-
er (DLC) by using SUZUKI scan tool (Tech-1).
(Diagnostic information can be checked and erased by using a
scan tool)
2 Driving Cycle Detection Logic
Refer to Section 6 or 6-1 for details.
Freeze Frame Data
Refer to Section 6 or 6-1 for details.

7B-12 AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC)
PRECAUTION IN DIAGNOSING TROUBLE

Don’t disconnect couplers from PCM, battery cable from battery, PMC ground wire harness from engine or main
fuse before checking the diagnosis information (DTC, freeze frame data, etc.) stored in PCM memory.
Such disconnection will clear memorized information in PCM.

Using SUZUKI scan tool (Tech-1) the diagnostic information stored in PCM memory can be checked and cleared
as well. Before its use, be sure to read Operator’s (instruction) Manual supplied with it carefully to have good
understanding of its functions and usage.

Priorities for diagnosing troubles
If two or more diagnostic trouble codes (DTCs) are stored, proceed to flow table (chart) of DTC which was de-
tected earliest in order and follow instruction in that table (chart).
If no instructions are given, troubleshoot diagnostic trouble codes according to the following priorities.
1. Diagnostic trouble codes (DTCs) other than DTC P0171 / P0172 (Fuel system too lean / too rich), DTC
P0300 / P0301 / P0302 / P0303 / P0304 (Misfire detected) and DTC P0400 (EGR flow malfunction)
2. DTC P0171 / P0172 (Fuel system too lean / too rich) and DTC P0400 (EGR flow malfunction)
3. DTC P0300 / P0301 / P0302 / P0303 / P0304 (Misfire detected)

Be sure to read “PRECAUTION FOR ELECTRICAL CIRCUIT SERVICE” in Section 0A before inspection and
observe what is written there.

PCM replacement
When substituting a known-good PCM, check for following conditions.
Neglecting this check may result in damage to good PCM.
–All relays and actuators have resistance of specified value.
–MAF sensor, TP sensor and fuel tank pressure sensor (if equipped) are in good condition. Also, the power cir-
cuit of these sensors is not shorted to the ground.

AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC) 7B-13
AUTOMATIC TRANSMISSION DIAGNOSTIC FLOW TABLE
Refer to the following pages for the details of each step.
STEP
ACTIONYESNO
1Customer Complaint Analysis
1) Perform customer complaint analysis referring to the next
page.
Was customer complaint analysis performed according to
instruction on the next page?Go to Step 2.Perform
customer
complaint
analysis.
2Diagnostic Trouble Code (DTC) and Freeze Frame Data
Check, Record and Clearance
1) Check for DTC (including pending DTC) referring to the
next page.
Is there any DTC(s)?1) Print DTC and
freeze frame
data or write
them down
and clear
them by
referring to
“DTC CLEAR-
ANCE” in this
section.
2) Go to Step 3.Go to Step 4.
3Visual Inspection
1) Perform visual inspection referring to the next page.
Is there any faulty condition?1) Repair or
replace
malfunction
t
Go to Step 5.
4Visual Inspection
1) Perform visual inspection referring to the next page.
Is there any faulty condition?part.
2) Go to Step
11 .Go to Step 8.
5Trouble Symptom Confirmation
1) Confirm trouble symptom referring to the next page.
Is trouble symptom identified?Go to Step 6.Go to Step 7.
6Rechecking and Record of DTC / Freeze Frame Data
1) Recheck for DTC and freeze frame data referring
to “DTC CHECK” in this section.
Is there any DTC(s)?Go to Step 9.Go to Step 8.
7Rechecking and Record of DTC / Freeze Frame Data
1) Recheck for DTC and freeze frame data referring to “DTC
CHECK” in this section.
Is there any DTC(s)?Go to Step 9.Go to Step 10.
8Automatic Transmission Basic Inspection and
Symptoms-to-Inspection Table
1) Check and repair according to “A / T BASIC CHECK” and
“SYMPTOM-TO-INSPECTION TABLE” in this section.
Are check and repair complete?Go to Step 11.1) Check and
repair
malfunction
part(s).
2) Go to Step 11.
9Trouble shooting for DTC
1) Check and repair according to applicable DTC flow Table.
Are check and repair complete?
10Check for Intermittent Problems
1) Check for intermittent problems referring to the next page.
Is there any faulty condition?1) Repair or
replace
malfunction
part(s).
2) Go to Step 11.Go to Step 11.
11Final Confirmation Test
1) Clear DTC if any.
2) Perform final confirmation test referring to the next page.
Is there any problem symptom, DTC or abnormal condition?Go to Step 6.End.