Suzuki Grand Vitara XL-7 Service Manual page 437

7B1-32 AUTOMATIC TRANSMISSION (4 A / T)
TABLE A-1: NO GEAR SHIFT TO O/D
SYSTEM DESCRIPTION
TCM does not shift to O/D gear under any of the following conditions.
D O/D off switch is ON. ("O/D OFF" lamp ON.)
D 4WD low switch is ON.
D Output shaft speed sensor is in faulty condition. (P0720)
TROUBLESHOOTING
WARNING
D 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.
D Road test should be carried out with 2 persons, a driver and tester, on a level road.
Step
1 Was "A/T DIAGNOSTIC FLOW TABLE" in this
section performed?
2 Check DTC.
Is DTC P0720 detected?
3 Perform running test under the following
conditions and check voltage between
terminal E203-4 of TCM connector and
ground, terminal E203-3 of TCM connector
and ground.
D O/D off switch is OFF.
D Selector lever is in "D" range.
D Transfer lever is in "2H" position.
D Drive vehicle with 4th gear condition referring
to "GEAR SHIFT DIAGRAM" in this section.
Is each terminal voltage 0 – 1 V?
4 "O/D" off switch signal inspection.
With ignition switch ON, check voltage
between terminal E202-3 of TCM connector
and ground.
O/D off switch OFF : 10 – 14 V
O/D off switch ON : 0 – 1 V
Is result as specified?
5 4WD low switch signal inspection
With ignition switch ON, check voltage
between terminal E202-1 of TCM connector
and ground.
Transfer gear position "4L" or "N" : 0 – 1 V
Transfer gear position "2H" or "4H" : 10 – 14 V
Is result as specified?
Action Yes
Go to Step 2.
Perform "TROUBLE
DIAGNOSIS TABLE" to
repair and retry.
Faulty shift solenoid
valve, circuit or
transmission.
Go to Step 5.
Substitute a known-good
TCM and recheck.
No
Go to "A/T DIAGNOSTIC
FLOW TABLE" in this
section.
Go to Step 3.
"GRN" or "GRN/RED"
circuit shorted to power
circuit. If wire is OK, go to
Step 4.
Faulty O/D off switch or
its circuit.
If OK, substitute a known-
good TCM and recheck.
Faulty 4WD low switch or
its circuit.
If OK, substitute a known-
good TCM and recheck.