Suzuki GRAND VITARA JB416, Service Manual

Page: 339 / 474

Automatic Transmission/Transaxle: 5A-20
No Gear Shift to 4th Gear
S5JB0E5104020
System Description
TCM does not shift to 4th gear under any of the following condition.
• “3” position switch signal is inputted.
• 4L/N switch (if equipped) is turned ON. (4L or N mode)
• TCM detects the following DTCs.
DTC, P0722, P0752, P0962, P0963, P0973, P0974, P0976, P0977, P1702
Troubleshooting
WARNING
!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and tester, on a level road.
Step Action Yes No
1 Was “A/T System Check” performed? Go to Step 2. Go to “A/T System
Check: in related
manual”.
2 Check DTC
Is DTC, P0722, P0752, P0962, P0963, P0973, P0974,
P0976, P0977 or P1702 detected?
Perform DTC Flow to
repair and retry. Go to Step 3.
3 ECT check
1) Warm up engine to normal operating temperature.
2) Check ECT monitored by TCM using scan tool.
Is ECT indicated –40
°
C (–40
°
F)?
Go to Step 4. Faulty ECT sensor, its
circuit or engine cooling
system. If OK, substitute
a known-good TCM and
recheck.
4 “3” position switch signal inspection
1) With ignition switch ON, check voltage between terminal
“E92-20” of TCM connector and ground under the
following conditions.
“3” position switch specification
Shift selector lever to “P”, “R”, “N” or “D” range: 2.9
– 3.8 V
Shift selector lever to “3”, “2” or “L” range: 1.4 – 2.0
V
Is result as specified?
• For vehicle equipped
with 4L/N switch, go
to Step 5.
• For vehicle equipped
without 4L/N switch,
substitute a known-
good TCM and
recheck.
Faulty “3” position
switch or its circuit. If
OK, substitute a known-
good TCM and recheck.
5 4L/N switch signal inspection
1) With ignition switch ON, check voltage between terminal
“E93-4” of TCM connector and ground.
4L/N switch specification
Transfer gear position “4H”: Battery voltage
Transfer gear position “4L” or “N”: 0 – 2 V
Is result as specified?
Substitute a known-
good TCM and recheck. Faulty 4L/N switch or its
circuit. If OK, substitute
a known-good TCM and
recheck.