2001 SUZUKI GRAND VITARA 4wd function

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-4 DIFFERENTIAL (FRONT)
Flow table
Step Action Yes No
1 Turn ON ignition switch (but engine at stop) and
check malfunction indicator lamp.
Does lamp light up?Go to step 2. A trouble has occurred
at some place. Repair
it referring to
MALFUNCTION INDI-
CATOR LAMP
(“CHECK ENGINE”
LAMP) CHECK in
DIAGNOSIS of Sec-
tion 6.
2 Check 4WD switch circuit.
Turn ignition switch ON and check that voltage
between terminal C51-3-7 and terminal C51-3-17
(ground) is as follows.
 When transfer shift lever is in N or 2H : 10 – 14 V
 When transfer shift lever is in 4L or 4H : 0 – 1 V
Is the check result satisfactory?Go to step 3. Check 4WD switch
(refer to Section 7A),
“BLK/ORN” and “BLK”
circuits of 4WD switch.
If OK, substitute a
known-good ECM
(PCM) and recheck.
3 Check power supply.
1) Turn ignition switch ON.
2) Check voltage between C51-1-9 and C51-3-17
(ground). The check results should be as follows.
 When transfer shift lever is in N or 2H : 0 – 1 V
 When transfer shift lever is in 4L or 4H : 10 – 14 V
Is the check result satisfactory?Go to step 4. Check “RED” circuit. If
it is OK, substitute a
known-good ECM
(PCM) and recheck.
4 Check air pump assembly circuit.
1) Check for proper connection to air pump assem-
bly at all terminals.
2) Turn ignition switch ON.
3) Check voltage between C51-3-18 and C51-3-17
(ground). The check result should be as follows.
 When transfer shift lever is in 2H or N : 0 – 1 V
 When transfer shift lever is in 4L or 4H (more than
4 seconds after shifted to 4L or 4H) : 10 – 14 V
Is the check result satisfactory?Go to step 5. Check air pump
assembly referring to
“ON-VEHICLE SER-
VICE”, and then
“PNK” circuit.
If OK, substitute a
known-good ECM
(PCM) and recheck.
5 Check 4WD indicator lamp circuit.
1) Turn ignition switch ON.
2) Check voltage between E61-19 and C51-3-17
(ground). The check result should be as follows.
 When transfer shift lever is in 2H or N : 10 – 14 V
 When transfer shift lever is in 4L or 4H : 0 – 1 V
Is the check result satisfactory?4WD control system is
in good condition.Check “ORN/BLK” cir-
cuit (including indica-
tor lamp and
combination meter).
If OK, substitute a
known-good ECM
(PCM) and recheck.

8C-2 INSTRUMENTATION/DRIVER INFORMATION
General Description
Combination Meter
1. Tachometer 8. Multifunction indicator light 15. Charge warning light
2. Speedometer 9. Turn signal pilot light (RH) 16. Brake fluid level, parking brake and EBD warning light
3. Fuel level meter 10. AIR BAG warning light 17. POWER indicator light (A/T vehicle only)
4. Engine coolant temperature meter 11. O/D OFF light (A/T vehicle only) 18. CRUISE indicator light
5. Turn signal pilot light (LH) 12. Fasten seat belt light (if equipped) 19. Immobilizer warning light (if equipped)
6. 4WD indicator 13. High beam light 20. Shift position indicator (A/T vehicle, if equipped)
7. ABS warning light 14. Engine oil pressure warning light