2000 SUZUKI SWIFT Transmission Service Workshop Manual

AUTOMATIC TRANSMISSION (4 A/T) 7B-47
DTC P0710 (DTC No.36/38) TRANSMISSION TEMPERATURE SENSOR CIRCUIT MALFUNC-
TION
1. Transmission temperature sensor 3. TCM
2. Coupler 4. TCM coupler (viewed from harness side)
DTC DETECTING CONDITION
A/T fluid temperature signal input voltage too low.
A/T fluid temperature signal input voltage does not go down although standard value of engine rev. signal
input.
Step Action Yes No
1 1) Turn ignition switch OFF and disconnect
sensor wire harness coupler.
2) Measure resistance between “BLU/RED”
wire and “GRY/RED” wire terminal of sen-
sor side coupler.
Is it infinity or 0 Ω
?Faulty transmission tem-
perature sensor.
Replace transmission
temperature sensor.Go to Step 2.
2 Is DTC No.36? Go to Step 4. Go to Step 3.
3 Is DTC No.38? Go to Step 5. Go to Step 6.
(When DTC is P0710.)
4 1) Turn ignition switch OFF and connect sen-
sor wire harness coupler.
2) Disconnect TCM couplers.
3) Measure the resistance between terminal
“C44-3” and “C44-16” of disconnected har-
ness side coupler.
Is it about 0 Ω
?“BLU/RED” and “GRY/
RED” wire shorted each
other.Substitute a known-good
TCM and recheck.

7B-48 AUTOMATIC TRANSMISSION (4 A/T)
Figure for Step 75 1) Turn ignition switch OFF and connect sen-
sor wire harness coupler.
2) Disconnect TCM couplers.
3) Measure the resistance between terminal
“C44-3” and “C44-16” of disconnected har-
ness side coupler.
Is it infinity?“BLU/RED” or “GRY/
RED” wire open or poor
connection of solenoid
wire harness coupler.Go to Step 7.
6 1) Turn ignition switch OFF and connect sen-
sor wire harness coupler.
2) Disconnect TCM couplers.
3) Measure the resistance between terminal
“C44-3” and “C44-16” of disconnected har-
ness side coupler.
Is it about 0 Ω
or infinity?“BLU/REDl” or “GRY/
RED” wire open, shorted
each other or poor con-
nection of solenoid wire
harness coupler.Go to Step 7.
7 1) Turn ignition switch OFF and connect TCM
couplers.
2) Disconnect solenoid wire harness coupler.
3) Turn ignition switch ON then measure volt-
age between “BLU/RED” wire terminal of
disconnected harness side coupler and
engine ground. (See figure.)
Is it 4 – 6 V?Intermittent trouble or
faulty TCM.
Check for intermittent
referring to “INTERMIT-
TENT AND POOR CON-
NECTION” in Section 0A.
If no trouble found, substi-
tute a known-good TCM
and recheck.“BLU/RED” wire shorted
to power circuit or poor
connection of terminal
“C44-3”.
If wire and connection are
OK, substitute a known-
good TCM. Step Action Yes No
1. BLU/RED wire terminal

AUTOMATIC TRANSMISSION (4 A/T) 7B-49
DTC P0763 (DTC NO.43) SHIFT SOLENOID-C (NO.3) ELECTRICAL
DTC P0768 (DTC NO.45) SHIFT SOLENOID-B (NO.4) ELECTRICAL
DTC P0773 (DTC NO.48) SHIFT SOLENOID-E (NO.5) ELECTRICAL
1. Dropping resistor 4. Shift solenoid-D (No.4) 7. TCM coupler (viewed from harness side)
2. solenoid coupler 5. Shift solenoid-E (No.5)
3. Shift solenoid-C (No.3) 6. TCM
12V
C44-24
C44-13
C44-12
C44-11
C44-25
C44-26
C44-15
1
6
23
4
5
BRN/WHTGRY/BLU
RED/BLU
BLU/ORN
BRN
BLK/YEL
BRN/WHT
BLK/YEL
BRN
BLK
RED
YEL
BRN
7
DTC DETECTING CONDITION
Solenoid output voltage too high or too low differently from TCM order.
Step Action Yes No
1 1) Turn ignition switch OFF and disconnect sole-
noid coupler.
2) Measure resistance between terminal of sole-
noid coupler and transmission ground. (See
figure.)
Is it 2.5 – 3.5 Ω
?Go to Step 2.Solenoid lead wire open or
shorted to ground.
Malfunction of solenoid
valve.
2 1) Disconnect TCM couplers.
2) Measure resistance between terminal of dis-
connected body side solenoid coupler and
terminal “C44-11”, “C44-12” or “C44-13” of
disconnected harness side TCM coupler.
(See chart.)
Is it 6.5 – 8.5 Ω
?Go to Step 3. Inspect dropping resister refer-
ring to “DROPPING RESIS-
TOR” in this section.
If OK, circuit between TCM
and dropping resister or drop-
ping resister and solenoid cou-
pler open.
3 Check continuity between terminal “C44-24”,
“C44-25” or “C44-26” of disconnected TCM cou-
pler and terminal of disconnected body side sole-
noid coupler. (See chart.)
Is there continuity?Go to Step 4. Circuit between TCM and sole-
noid coupler open.

7B-50 AUTOMATIC TRANSMISSION (4 A/T)
Chart for Step 2
Chart for Step 3
Chart for Step 5
Figure for Step 1 and 54 Check continuity between terminal of discon-
nected body side solenoid coupler and transmis-
sion ground with TCM, dropping resister and
solenoid couplers disconnected.
Is there continuity?Circuit between
TCM and transmis-
sion shorted to
ground.Go to Step 5.
5 Check continuity between terminal of discon-
nected body side dropping resistor coupler and
transmission ground. (See chart.)
Is there continuity?Circuit between
TCM and dropping
resister is shorted
to ground.Intermittent trouble or faulty
TCM.
Check for intermittent referring
to “INTERMITTENT AND
POOR CONNECTION” in Sec-
tion 0A. If no trouble found,
substitute a known-good TCM
and recheck.
Solenoid TCM terminal No.Solenoid coupler lead wire color
(body side)
C (No.3) C44-11 BRN
D (No.4) C44-12 BLK/YEL
E (No.5) C44-13 BRN/WHT
Solenoid TCM terminal No.Solenoid coupler lead wire color
(body side)
C (No.3) C44-24 BRN
D (No.4) C44-25 BLK/YEL
E (No.5) C44-26 BRN/WHT
Solenoid TCM terminal No.Dropping resistor lead wire color
(body side)
C (No.3) C44-11 GRY/BLU
D (No.4) C44-12 RED/BLU
E (No.5) C44-13 BLU/ORN
1. Solenoid coupler
2. Terminal for shift solenoid-C (No.3)
3. Terminal for shift solenoid-D (No.4)
4. Terminal for shift solenoid-E (No.5)
5. Transmission range sensor (Shift switch)
6. Dropping resistor terminal for shift solenoid-C (No.3)
7. Dropping resistor terminal for shift solenoid-D (No.4)
8. Dropping resistor terminal for shift solenoid-E (No.5)
9. Dropping resistor coupler
Step Action Yes No

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

7B-54 AUTOMATIC TRANSMISSION (4 A/T)
C4312Serial data link (SUZUKI scan
tool)10 – 14 V IG switch ON
13Output shaft speed sensor
shield––
14 Output shaft speed sensor(–)––
15 Input shaft speed sensor(–)––
C442 IG power source 10 – 14 V IG switch ON
3Transmission temperature
sensor0 – 4.5 V IG switch ON
4 Brake switch 10 – 14 V IG switch ON, brake pedal depressed
5 A/C compressor0 – 2 V A/C OFF
10 – 14 V A/C ON
8 Idle up signal10 – 14 V Selector lever at “P” or “N” range
0 – 1 V Selector lever other than “P” or “N” range
10 Shift solenoid-A (No.1) 0 – 1 V IG switch ON, select lever at “P” range
11Shift solenoid-C (Dropping
resistor)0 – 1 V IG switch ON, select lever at “P” range
12Shift solenoid-D (Dropping
resistor)10 – 14 V IG switch ON, select lever at “P” range
13Shift solenoid-E (Dropping
resistor)0 – 1 V IG switch ON, select lever at “P” range
15 Ground––
16Transmission temperature
sensor ground––
17 O/D off switch0 – 1 V IG switch ON, O/D off switch ON
10 – 14 V IG switch ON, O/D off switch OFF
18Engine coolant temperature/
Barometric pressure signal––
20 A/T failure serial data 0 – 1 V IG switch ON
21 O/D OFF lamp10 – 14 V IG switch ON, O/D off switch OFF
0 – 1 V IG switch ON, O/D off switch ON
22 Lock-up solenoid 0 – 1 V IG switch ON, selector lever at “P” range
23 Shift solenoid-B (No.2) 0 – 1 V IG switch ON, selector lever at “P” range
24 Shift solenoid-C (No.3) 0 – 1 V IG switch ON, selector lever at “P” range
25 Shift solenoid-D (No.4) 2.2 – 4.9 V IG switch ON, selector lever at “P” range
26 Shift solenoid-E (No.5) 0 – 1 V IG switch ON, selector lever at “P” range TERMINAL CIRCUITSTAN-
DARD
VOLTAGECONDITION