2001 SUZUKI GRAND VITARA Owners Manual

7B1-32 AUTOMATIC TRANSMISSION (4 A/T)
DTC P0720 (DTC NO.75) Output Speed Sensor Circuit Malfunction
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool.
3) Start engine and shift transfer lever to “2H” or “4H” range.
4) Drive vehicle at 40 km/h (25 mile/h) or more for longer than 10 sec. (or higher than 3500 r/min engine speed
with “D” range for longer than 10 sec.)
5) Stop vehicle and check DTC and/or pending DTC.
1. PCM
2. Output shaft speed sensor
DTC DETECTING CONDITION TROUBLE AREA
•With 4WD LOW switch OFF, no output shaft speed
sensor signal is inputted while vehicle speed sensor
signal are inputted,
or
•With 4WD LOW switch OFF, no output shaft speed
sensor signal is inputted while engine running at
higher than specified engine speed with “D” range.
(2 driving cycle detection logic)•Output speed sensor or its circuit
•PCM
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.

AUTOMATIC TRANSMISSION (4 A/T) 7B1-33
TROUBLESHOOTING
REFERENCE
Connect oscilloscope between C51-1-23 (+) and C51-1-22 (–) of
PCM connector connected to PCM and check output speed sen-
sor signal. Step Action Yes No
1Was “A/T DIAGNOSTIC FLOW TABLE” in this
section performed?Go to Step 2. Go to “A/T DIAGNOSTIC
FLOW TABLE” in this sec-
tion.
2 Output shaft speed sensor circuit check :
1) Remove PCM cover.
2) With ignition switch OFF, disconnect PCM
connectors.
3) Check for proper connection to output
speed sensor at C51-1-22 and C51-1-23
terminals.
4) If OK, check resistance of sensor circuit.
Resistance between C51-1-22 and C51-1-23 :
387 – 473 Ω
ΩΩ Ω (at 20 °C (68 °F))
Resistance between C51-1-22/C51-1-23 and
ground :
1 MΩ
ΩΩ Ω or more
Are check results satisfactory?Go to Step 4. Go to Step 3.
3 Output shaft speed sensor check :
1) With ignition switch OFF, disconnect output
shaft speed sensor connector.
2) Check for proper connection to output shaft
speed sensor at each terminals.
3) If OK, then check resistance of output shaft
speed sensor.
Are measured values as specified in Step 2?“ORN” or “WHT” wire
open or shorted to
ground.Replace output shaft
speed sensor.
4 Check visually output shaft speed sensor and
sensor rotor for the followings.
•No damage
•No foreign material attached
•Correct installation
Are they in good condition?Intermittent trouble or
faulty PCM.
Check for intermittent
referring to “INTERMIT-
TENT AND POOR CON-
NECTION” in Section 0A.Clean, repair or replace.
[A] : Oscilloscope waveforms at about 40 km/h (25 mile/h)

7B1-34 AUTOMATIC TRANSMISSION (4 A/T)
DTC P0743 (DTC NO.65/66) - TCC (Lock-Up) Solenoid Electrical
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
1. PCM
2. Shift solenoid-A
3. Shift solenoid-B
4. TCC solenoid
DTC DETECTING CONDITION TROUBLE AREA
Voltage at terminal C51-1-8 of PCM is high while TCC
solenoid OFF is commanded or low while TCC sole-
noid ON is commanded.•TCC (lock-up) solenoid valve
•TCC (lock-up) solenoid valve circuit
•PCM

AUTOMATIC TRANSMISSION (4 A/T) 7B1-35
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to “2H” or “4H” range.
4) Shift selector lever in D range and keep it there for 10 seconds.
5) Increase vehicle speed to about 80 km/h (50 mile/h) in 4th gear and in D range.
6) Keep driving at above speed for 20 seconds.
7) Release accelerator pedal, decrease vehicle speed and stop vehicle.
8) Check DTC and/or pending DTC.
TROUBLESHOOTING
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.
Step Action Yes No
1Was “A/T DIAGNOSTIC FLOW TABLE” in this
section performed?Go to Step 2. Go to “A/T DIAGNOSTIC
FLOW TABLE” in this sec-
tion.
2 Check TCC solenoid circuit for short.
1) Turn ignition switch OFF and disconnect
PCM connectors.
2) Check for proper connection to PCM at ter-
minal C51-1-8.
3) If OK, then turn ignition switch ON and mea-
sure voltage between terminal C51-1-8 of
disconnected PCM connector and ground.
Is it about 0 V?Go to Step 3.“GRN/YEL” circuit shorted
to power circuit.
3 Check TCC solenoid circuit for open or short.
1) Turn ignition switch OFF.
2) Measure resistance between terminal C51-
1-8 of disconnected PCM connector and
ground.
Is it 11 – 15 Ω (at 20 °C (68 °F))?Intermittent trouble or
faulty PCM.
Check for intermittent
referring to “INTERMIT-
TENT AND POOR CON-
NECTION” in Section 0A.“GRN/YEL” circuit open or
shorted to ground.
If wire and connections
are OK, replace TCC
solenoid.

7B1-36 AUTOMATIC TRANSMISSION (4 A/T)
DTC P0753 (DTC NO.61/62) Shift Solenoid-A (#1) Electrical
DTC P0758 (DTC NO.63/64) Shift Solenoid-B (#2) Electrical
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
1. PCM
2. Shift solenoid-A
3. Shift solenoid-B
4. TCC solenoid
DTC DETECTING CONDITION TROUBLE AREA
DTC P0753 (DTC NO.61/62):
Voltage detected at C51-1-2 terminal is specified volt-
age or lower when shift solenoid valve-A is ON or
specified voltage or higher when it is OFF.•Shift solenoid valve-A
•Shift solenoid valve-A circuit
•PCM
DTC P0758 (DTC NO.63/64):
Voltage detected at C51-1-1 terminal is specified volt-
age or lower when shift solenoid valve-B is ON or
specified voltage or higher when it is OFF.•Shift solenoid valve-B
•Shift solenoid valve-B circuit
•PCM

AUTOMATIC TRANSMISSION (4 A/T) 7B1-37
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF, if available.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool.
3) Start engine and shift transfer lever to “2H” or “4H” range.
4) Shift selector lever in D range and keep it for 10 seconds.
5) Drive vehicle about 30 km/h (20 mile/h) with 2nd gear in “D” range for 10 seconds.
6) Increase vehicle speed to about 80 km/h (50 mile/h) with 4th gear in D range and keep it for 10 seconds.
7) Release accelerator pedal, decrease vehicle speed and stop vehicle.
8) Check DTC and/or pending DTC.
TROUBLESHOOTING
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.
Step Action Yes No
1Was “A/T DIAGNOSTIC FLOW TABLE” in this
section performed?Go to Step 2. Go to “A/T DIAGNOSTIC
FLOW TABLE” in this sec-
tion.
2 Check shift solenoid circuit for short.
1) Turn ignition switch OFF and disconnect
PCM connectors.
2) Check for proper connection to PCM at ter-
minals C51-1-2 or C51-1-1.
3) If OK, then turn ignition switch ON and mea-
sure voltage between terminal C51-1-2 or
C51-1-1 of disconnected PCM connector
and ground.
Is it about 0 V?Go to Step 3.“GRN” or “GRN/RED“ cir-
cuit shorted to power cir-
cuit.
3 Check shift solenoid circuit for open or short.
1) Turn ignition switch OFF.
2) Measure resistance between terminal C51-
1-2 or C51-1-1 of disconnected PCM con-
nector and ground.
Is it 11 – 15 Ω (at 20 °C (68 °F))?Intermittent trouble or
faulty PCM.
Check for intermittent
referring to “INTERMIT-
TENT AND POOR CON-
NECTION” in Section 0A.“GRN” or “GRN/RED“ cir-
cuit open or shorted to
ground.
If wire and connections
are OK, replace malfunc-
tion shift solenoid.

7B1-38 AUTOMATIC TRANSMISSION (4 A/T)
Stall Test
This test is to check overall performance of automatic transmission and engine by measuring stall speed at “D”
and “R” ranges. Be sure to perform this test only when transmission fluid is at normal operating temperature and
its level is between FULL and LOW marks.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to “P”.
4) Depress brake pedal fully.
5) Shift select lever to “D” and depress accelerator pedal fully while watching tachometer. Read engine rpm
quickly when it has become constant (stall speed).
6) Release accelerator pedal immediately after stall speed is checked.
7) In the same way, check stall speed in “R” range.
8) Stall speed should be within the following specification.
Stall speed :
2,460 – 2,760 r/min.
TROUBLESHOOTING
CAUTION:
Do not run engine at stall more than 5 seconds continuously, for fluid temperature may rise exces-
sively high.
After performing stall test, be sure to leave engine running at idle for longer than 30 seconds before
another stall test.
Condition Possible cause
Lower than standard level•Faulty engine output
•Defective torque converter
Higher than standard level in “D” range•Slippery O/D clutch
•Slippery forward clutch
•Malfunctioning O/D one-way clutch
•Malfunctioning one-way clutch No. 2
•Low line pressure
Higher than standard level in “R” range•Slippery direct clutch
•Slippery reverse brake
•Low fluid pressure
•Slippery O/D clutch
•Defective O/D one-way clutch

AUTOMATIC TRANSMISSION (4 A/T) 7B1-39
Line Pressure Test
Purpose of this test is to check operating conditions of each part
by measuring fluid pressure in fluid pressure line. Line pressure
test requires following conditions.
•Automatic fluid is at normal operating temperature (70 to 80
°
C/158 – 176 °F).
•Fluid is filled to proper level (between FULL HOT and LOW
HOT on dipstick).
1) Apply parking brake securely and place checks against
wheels.
2) Attach oil pressure gauge to fluid pressure check hole (1) in
transmission case.
Special tool
(A) : 09925-37811-001
3) Depress foot brake fully, run engine at idle and stall.
4) Check fluid pressure in “D” or “R” range within the following
specification.
Line pressure :
5) If check result is OK, disconnect special tool, then tighten
transmission case plug to specified torque.
Tightening torque
Transmission case plug : 17 N·m (1.7 kg-m, 12.0 lb-ft) CAUTION:
After attaching oil pressure gauge, check that not fluid
leakage exists.
CAUTION:
Do not continue running engine at stall speed longer
than 5 seconds.
“D” range“R” range
Idle speed
4.1 – 4.6 kg/cm
2
58 – 65 psi5.4 – 6.0 kg/cm
2
77 – 85 psi
Stall speed
12.0 – 13.5 kg/cm
2
171 – 192 psi14.6 – 17.1 kg/cm
2
208 – 243 psi