2001 SUZUKI GRAND VITARA 4WD SWITCH

7B1-4 AUTOMATIC TRANSMISSION (4 A/T)
Electronic Shift Control System
1. PCM (ECM) 9. Transmission range sensor 17. MIL (“SERVICE ENGINE SOON” lamp)
2. VSS 10. Shift solenoid-A 18. O/D off switch
3. CMP sensor 11. Shift solenoid-B 19. P/N change switch
4. TP sensor 12. TCC solenoid 20. 4WD low switch
5. ECT sensor 13. Data link connector 21. Main relay
6. Stop lamp switch 14. Cruise control module 22. Ignition switch
7. Input shaft speed sensor 15.“POWER” lamp 23. Battery
8. Output shaft speed sensor 16.“O/D OFF” lamp 24. PCM (ECM) connector terminal (viewed from harness side)
5V
5V5V
5V5V
5V
5V 5V C51-1-14
C51-1-12
C51-1-13
C51-3-26
C51-3-12
C51-3-13
C51-3-9
C51-3-2
C51-3-24
C51-1-11
C51-1-10
C51-1-20 C51-1-21
C51-1-23
C51-1-22
C51-1-7
C51-1-6
C51-1-19
C51-1-18
C51-1-28
C51-1-27
C51-1-2
C51-1-1
C51-1-8
E61-13
E61-35
E61-4C51-1-26 E61-31 E61-33 E61-21 E61-20 E61-7
C51-3-20
E61-2
E61-9
C51-3-4
C51-3-15
C51-3-6
C51-3-17
C51-2-7
12V
12V 12V 12V
12V
12V
12V
12V
5V
12V
BLU/YEL
YEL/GRN
YEL/BLU
GRY/YEL
GRY/YEL
GRY/RED
RED/GRN
ORN/BLU
GRY/YEL
BLU/YEL
BLU/GRN
WHT
ORN
ORN/GRN
RED P
R
N
D
2
LORN/BLU
YEL/GRN
GRN/ORN
GRN/BLU
GRN
GRN/RED
GRN/YEL
PPL/RED
PNK/BLU
GRY
PPL/YEL
WHT/BLK
GRY/BLU
YEL/RED
ORN/BLU
WHT
BLU
BLU/BLK
BLU/BLK
BLK/GRN
BLK/ORN
BLK/GRNBLK/WHT ORN/WHT
8
7
23 22
35 346
20 21
335
19
3218
3117
3016 15
2914
284
13
273
12
26112
10
256
5
17 16
26 252
1
98
21 202
1
98
22 21 1
9
247
20
306
19
2918
27 17
2816 15
2614
25 5
13 4
12
24113
10
23 7
19
28654 3
18
2717 16
2615 14
2513
2412
2311
2210 4
15 14
2413
2312
2211 10 9 8 7
213
202
191
18
24
E61 C51-3 C51-1 C51-2 14
13
B+
B+
17
16
15
18
19
20
22
21
23
BB+
IG1
B+
IG2
1 2
3
4
5
7 6
8
IG1
9
10
11
12
BB+
E61-34 GRN/WHT
BB+

AUTOMATIC TRANSMISSION (4 A/T) 7B1-15
Trouble Diagnosis Table 1
Trouble Diagnosis Table 2
TRANSMISSION FLUID
RUNNING CONDITION
4 Perform stall test, time rag test, line pressure test,
engine brake test and “P” range test referring to
“STALL TEST”, “LINE PRESSURE TEST”, “ENGINE
BRAKE TEST” and ““P” RANGE TEST” in this section.
Are the test results satisfactory?Go to Step 5. Proceed to “TROUBLE
DIAGNOSIS TABLE 3” in
this section.
5 Proceed to “TROUBLE DIAGNOSIS TABLE 2” in this
section.
Is trouble identified?Repair or replace
defective parts.Proceed to “TROUBLE
DIAGNOSIS TABLE 3” in
this section. Step Action Yes No
Condition Possible Cause Correction
TCC does not operateBrake pedal (stop lamp) switch or its circuit
faulty (H25 engine only)Refer to “DIAGNOSTIC FLOW
TABLE A-1” in this section.
4WD low switch or its circuit faulty
Engine coolant temp. sensor or its circuit faulty
Cruise control signal circuit faulty (if equipped)
Gear does not change
to 4thO/D off switch or its circuit faulty Refer to “DIAGNOSTIC FLOW
TABLE A-2” in this section.
4WD low switch or its circuit faulty
Engine coolant temp. sensor or its circuit faulty
Cruise control signal circuit faulty (if equipped)
Condition Possible Cause Correction
Low fluid pressureClogged oil pump strainer Wash strainer.
Malfunction of pressure regulator valve Overhaul valve body.
High fluid pressurePressure regulator valve Overhaul valve body.
Condition Possible Cause Correction
Unable to run in all
rangeRegulator valve stick Replace.
Clogged oil strainer Wash strainer.
Seized or broken planetary gear Repair or replace.
Faulty manual valve Replace.
Poor 1st speed run-
ning or excessive slip-
page in “D” or “2”Faulty 1–2 shift valve Replace.

7B1-18 AUTOMATIC TRANSMISSION (4 A/T)
Table A-1 : No TCC Lock-Up Occurs
SYSTEM DESCRIPTION
PCM turns TCC solenoid OFF under any of the following conditions.
•Brake pedal switch : ON
•4WD LOW switch : ON
•Cruise control module : TCC OFF command signal is output (if equipped).
•ECT : ECT < 30 °C (86 °F)
TROUBLESHOOTING
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 person, a driver and tester, on a level road.
Step Action Yes No
1Was “AUTOMATIC TRANSMISSION DIAG-
NOSTIC FLOW TABLE” performed?Go to Step 2. Go to “AUTOMATIC
TRANSMISSION DIAG-
NOSTIC FLOW TABLE” in
this section.
2 ECT check :
1) Warm up engine to normal operating tem-
perature.
2) Check ECT using scan tool.
Is ECT more than 30 °C (86 °F)?Go to Step 3. Faulty ECT sensor, its cir-
cuit or engine cooling sys-
tem.
If OK, substitute a known-
good PCM and recheck.
3 Perform running test under the following condi-
tions and check voltage between C51-1-8 termi-
nal of PCM coupler and ground.
•Normal mode in “D” range.
•Transfer “2H” position.
•Cruise control is not operated (if equipped).
•Brake pedal released.
•Drive vehicle with TCC ON condition refer-
ring to “TCC LOCK-UP DIAGRAM” in this
section.
Is it battery voltage?Faulty TCC solenoid
valve, its circuit or trans-
mission.Go to Step 4.
4 Brake switch signal inspection :
With ignition switch ON, check voltage between
E61-34 terminal of PCM coupler terminal and
ground.
Brake switch specification
Brake pedal released : 0 V
Brake pedal depressed : Battery voltage
Is the result as specified?Go to Step 5. Faulty brake pedal switch
or its circuit.
If OK, substitute a known-
good PCM and recheck.

AUTOMATIC TRANSMISSION (4 A/T) 7B1-19
5“4WD LOW” switch signal inspection :
With ignition switch ON, check voltage between
C51-1-26 terminal of PCM coupler and ground.
“4WD LOW” switch specification
Transfer gear position “4L” or “N” : 0 V
Transfer gear position “4H” or “2H” :
Battery voltage
Is the result as specified?Go to Step 6. Faulty “4WD LOW” switch
or its circuit.
If OK, substitute a known-
good PCM and recheck.
6 Is vehicle equipped with cruise control system? Go to Step 7. Substitute a know-good
PCM and recheck.
7 Cruise control signal inspection :
With ignition switch ON, check voltage between
E61-35 terminal of PCM coupler and ground.
Is it battery voltage?Substitute a known-good
PCM and recheck.Faulty cruise control mod-
ule or its circuit.
If OK, substitute a known-
good PCM and recheck. Step Action Yes No

7B1-20 AUTOMATIC TRANSMISSION (4 A/T)
Table A-2 : No Gear Shift to O/D
SYSTEM DESCRIPTION
PCM does not shift to O/D gear under any of the following conditions.
•O/D off switch : ON
•4WD LOW switch : ON
•Cruise control module : O/D OFF command signal is output (if equipped).
•ECT : ECT < 30 °C (86 °F)
TROUBLESHOOTING
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 person, a driver and tester, on a level road.
Step Action Yes No
1Was “AUTOMATIC TRANSMISSION DIAG-
NOSTIC FLOW TABLE” performed?Go to Step 2. Go to “AUTOMATIC
TRANSMISSION DIAG-
NOSTIC FLOW TABLE” in
this section.
2 ECT check :
1) Warm up engine to normal operating tem-
perature.
2) Check ECT using scan tool.
Is ECT more than 30 °C (86 °F)?Go to Step 3. Faulty ECT sensor, its cir-
cuit or engine cooling sys-
tem.
If OK, substitute a known-
good PCM and recheck.
3 Perform running test under the following condi-
tions and check voltage between C51-1-2 termi-
nal of PCM coupler and ground, C51-1-1
terminal of PCM coupler and ground.
•O/D off switch OFF (“O/D OFF” lamp OFF).
•Normal mode in “D” range.
•Transfer “2H” position.
•Cruise control is not operated (if equipped).
•Drive vehicle with 4th gear condition refer-
ring to “Gear shift diagram” in this section.
Is each voltage about 0 V?Faulty shift solenoid valve,
its circuit or transmission“GRN” wire or “GRN/
RED” wire shorted to
power circuit.
If OK, go to Step 4.
4 O/D off switch signal inspection :
With ignition switch ON, check voltage between
E61-33 terminal of PCM coupler and ground.
“O/D” cut switch specification
“O/D” cut switch OFF : Battery voltage
“O/D” cut switch ON : 0 V
Is the result as specified?Go to Step 5. Faulty O/D off switch or its
circuit.
If OK, substitute a known-
good PCM and recheck.

AUTOMATIC TRANSMISSION (4 A/T) 7B1-21
5“4WD LOW” switch signal inspection :
With ignition switch ON, check voltage between
C51-1-26 terminal of PCM coupler and ground.
“4WD LOW” switch specification
Transfer gear position “4L” or “N” : 0 V
Transfer gear position “4H” or “2H” :
Battery voltage
Is the result as specified?Go to Step 6. Faulty “4WD LOW” switch
or its circuit.
If OK, substitute a known-
good PCM and recheck.
6 Is vehicle equipped with cruise control system? Go to Step 7. Substitute a known-good
PCM and recheck.
7 Cruise control signal inspection :
With ignition switch ON, check voltage between
E61-35 terminal of PCM coupler and ground.
Is it battery voltage?Substitute a known-good
PCM and recheck.Faulty cruise control mod-
ule or its circuit.
If OK, substitute a known-
good PCM and recheck. Step Action Yes No

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.

7E-2 DIFFERENTIAL (FRONT)
General Description
4WD Control System
System circuit
1. 4WD switch 4. Release valve 7. Front differential 10. To ignition switch
2. Air pump assembly 5. Pressure switch 8. Air hose and pipe 11. ECM or PCM
3. Pump motor 6. Transfer 9. 4WD indicator lamp