2000 SUZUKI SWIFT ring

AUTOMATIC TRANSMISSION (4 A/T) 7B-51
DTC P1709 (DTC NO.51) ENGINE COOLANT TEMPERATURE/BAROMETRIC PRESSURE
SIGNAL CIRCUIT
1. ECM 3. TCM coupler (viewed from harness side)
2. TCM 4. ECM coupler (viewed from harness side)
DTC DETECTING CONDITION
Engine coolant temperature/barometric pressure signal voltage too low although A/T fluid temperature is
normal operating temperature and engine rev. is standard.
Step Action Yes No
1 Check DTC referring to “ENGINE DIAGNOSIS”
in Section 6.
Is any DTC detected?Inspect and repair refer-
ring to DTC flow table in
Section 6.Go to Step 2.
2 1) Turn ignition switch OFF and disconnect
TCM and ECM couplers.
2) Measure resistance between terminal “C44-
18” of disconnected harness side TCM cou-
pler and body ground.
Is it infinity?Go to Step 3.“WHT/BLK” wire shorted
to ground.
3 1) Turn ignition switch OFF and connect TCM
couplers.
2) Turn ignition switch ON and check voltage
between terminal “C44-18” and body
ground.
Is it 0V?Substitute a known-good
TCM and recheck.Substitute a know-good
ECM and recheck.

7B-52 AUTOMATIC TRANSMISSION (4 A/T)
DTC P0702/P1702 (DTC No.52)TRANSMISSION CONTROL SYSTEM ELECTRICAL OR
INTERNAL MALFUNCTION OF TCM
1. TCM 3. A/T relay
2. Ignition switch 4. TCM coupler (viewed from harness side)
DTC DETECTING CONDITION
Relay output voltage too high although TCM orders the relay to turn OFF or relay output voltage too low
although TCM orders the relay to turn on.
Incorrect calculations of checking TCM programmed data indicated.
Step Action Yes No
1 1) Turn ignition switch ON.
2) Erase all DTCs referring to “HOW TO
CLEAR DTC” in this section.
3) Turn ignition switch OFF.
4) Turn ignition switch ON once again and
check for any DTC.
Is it DTC P1702 (DTC No.52) or P0702 (DTC
No.52)?Replace TCM. Could be a temporary
malfunction of the TCM.

AUTOMATIC TRANSMISSION (4 A/T) 7B-53
INSPECTION OF TCM AND ITS CIRCUITS
TCM and its circuits can be checked at TCM wiring couplers by
measuring voltage and resistance.
INSPECTION
1) Remove TCM from vehicle referring to “TRANSMISSION
CONTROL MODULE” in this section.
2) Connect TCM couplers to TCM.
3) Check voltage at each terminal of couplers connected.CAUTION:
TCM cannot be checked by itself, it is strictly prohibited
to connect voltmeter or ohmmeter to TCM with coupler
disconnected from it.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition switch
is ON.
1. TCM 3. Body ground
2. Couplers
TERMINAL CIRCUITSTAN-
DARD
VOLTAGECONDITION
C431 Transmission range “P” switch10 – 14 V IG switch ON, selector lever at “P” range
0 – 1 V IG switch ON, selector lever other than “P” range
2 Transmission range “R” switch10 – 14 V IG switch ON, selector lever at “R” range
0 – 1 V IG switch ON, selector lever other than “R” range
3 Transmission range “N” switch10 – 14 V IG switch ON, selector lever at “N” range
0 – 1 V IG switch ON, selector lever other than “N” range
4 Diagnosis switch 10 – 14 VIG switch ON, diagnosis switch terminal not
grounded
5 Engine speed signal 0 – 1 V IG switch ON, leaving engine OFF
6 Output shaft speed sensor(+)––
7 Input shaft speed sensor(+)––
8 throttle opening signal––
9 Transmission range “D” switch10 – 14 V IG switch ON, selector lever at “D” range
0 – 1 V IG switch ON, selector lever other than “D” range
10 Transmission range “2” switch10 – 14 V IG switch ON, selector lever at “2” range
0 – 1 V IG switch ON, selector lever other than “2” range
11 Transmission range “L” switch10 – 14 V IG switch ON, selector lever at “L” range
0 – 1 V IG switch ON, selector lever other than “L” range

AUTOMATIC TRANSMISSION (4 A/T) 7B-55
ON-VEHICLE SERVICE
MAINTENANCE SERVICE
FLUID LEVEL AT NORMAL OPERATING TEMPERA-
TURE
INSPECTION
1) Stop vehicle and place it level.
2) Apply parking brake and place chocks against wheels.
3) With selector at P position, start engine.
4) Warm up engine till fluid temperature reaches normal oper-
ating temperature (70 – 80°C/158 – 176°F). As a guide to
check fluid temperature, warm up engine to normal operat-
ing temperature.
5) Keep engine idling and shift selector slowly to L and back to
P position.
6) With engine idling, pull out dipstick, wipe it off with a clean
cloth and put it back into place.
7) Pull out dipstick (1) again and check fluid level indicated on
it. Fluid level should be between FULL HOT and LOW HOT.
If it is below LOW HOT, add an equivalent of DEXRON
®-III
or DEXRON
®-IIE up to FULL HOT.
A/T fluid specification
: An equivalent of DEXRON
®-III or DEXRON®-IIE
NOTE:
 DO NOT RACE ENGINE while checking fluid level, even
after the engine start.
 DO NOT OVERFILL. Overfilling can cause foaming and
loss of fluid through breather. Then slippage and
transmission failure can result.
 Bringing the level from LOW HOT to FULL HOT
requires 0.35 liters (0.74/0.62 US/Imp. pt).
 If vehicle was driven under high load such as pulling a
trailer, fluid level should be checked about half an hour
after it is stopped.
2.“FULL HOT” mark
3.“LOW HOT” mark
4.“FULL COLD” mark
5.“LOW COLD” mark
1

AUTOMATIC TRANSMISSION (4 A/T) 7B-59
INSTALLATION
1) Using flat tip screwdriver, turn transmission range sensor to
have the match marks (1) line up (transmission range sensor
“N” range).
2) Turn selector lever (1) to “N” range (to have the automatic
transmission to “N” range).
3) Install transmission range sensor (1) to transmission case.
Tightening torque
Transmission range sensor bolt
(a) : 18 N·m (1.8 kg-m, 13.0 lb-ft)
4) Move selector lever in cabin to each range and check the
continuity of each terminal of transmission range sensor
referring to “INSPECTION”.
5) Connect transmission range sensor coupler.
6) Check that the engine can only be started in “N” and “P”
range, but can not in “D”, “2”, “L” or “R” range. Also, check
that backup lamp come ON at “R” range.

7B-62 AUTOMATIC TRANSMISSION (4 A/T)
OUTPUT SHAFT SPEED SENSOR (A/T VSS)
INSPECTION
1) Disconnect negative cable at battery.
2) Disconnect output shaft speed sensor – input shaft speed
sensor coupler (1).
3) Check resistance between output shaft speed sensor termi-
nals (2).
Output shaft speed sensor resistance
Standard : 160 – 200
Ω
ΩΩ Ω at 20°C (68°F)
REMOVAL
1) Disconnect negative cable at battery.
2) Disconnect output shaft speed sensor – input shaft speed
sensor coupler.
3) Remove output shaft speed sensor (1) by removing its bolt.
INSTALLATION
1) Apply A/T fluid to output shaft speed sensor o-ring.
2) Install output shaft speed sensor (1) to A/T case and tighten
bolt to specified torque.
Tightening torque
Output shaft speed sensor bolt
(a) : 8 N·m (0.8 kg-m, 6.0 lb-ft)
3) Connect output shaft speed sensor – input shaft speed sen-
sor coupler.
4) Connect negative cable to battery.

AUTOMATIC TRANSMISSION (4 A/T) 7B-63
INPUT SHAFT SPEED SENSOR
INSPECTION
1) Disconnect negative cable at battery.
2) Disconnect output shaft speed sensor – input shaft speed
sensor coupler (1).
3) Check resistance between input shaft speed sensor termi-
nals (2).
Input shaft speed sensor resistance
Standard : 160 – 200
Ω
ΩΩ Ω at 20°C (68°F)
REMOVAL
1) Disconnect negative cable at battery.
2) Disconnect output shaft speed sensor – input shaft speed
sensor coupler.
3) Remove input shaft speed sensor (1) by removing its bolt.
INSTALLATION
1) Apply A/T fluid to input shaft speed sensor O-ring.
2) Install input shaft speed sensor (1) to A/T case and tighten
bolt to specified torque.
Tightening torque
Input shaft speed sensor bolt
(b) : 8 N·m (0.8 kg-m, 6.0 lb-ft)
3) Connect output shaft speed sensor – input shaft speed sen-
sor coupler.
4) Connect negative cable to battery.
VEHICLE SPEED SENSOR (VSS)
Refer to Section 6E for removal, installation and inspection.
THROTTLE POSITION SENSOR
INSPECTION
Check throttle position sensor referring to Section 6E.

7B-64 AUTOMATIC TRANSMISSION (4 A/T)
ENGINE COOLANT TEMP. (ECT) SENSOR
INSPECTION
Check engine coolant temp. sensor referring to Section 6E.
DROPPING RESISTOR
REMOVAL/INSTALLATION
Refer to the figure for removal/installation.
Tightening torque
Dropping resistor bolts
(a) : 20 N·m (2.0 kg-m, 14.5 lb-ft)
INSPECTION
Measure resistance between each resistor terminals.
Dropping resistor resistance
CIRCUIT RESISTANCE
Shift solenoid -C (No.3) 6.5 – 8.5
Ω
ΩΩ Ω
Shift solenoid -D (No.4) 6.5 – 8.5
Ω
ΩΩ Ω
Shift solenoid -E (No.5) 6.5 – 8.5
Ω
ΩΩ Ω
1. Resistor terminal for shift solenoid -C Circuit
2. Resistor terminal for shift solenoid -D Circuit
3. Resistor terminal for shift solenoid -E Circuit