Suzuki GRAND VITARA XL-7 Owner's Manual page 429

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
1 Was "AUTOMATIC TRANSMISSION DIAG-
NOSTIC FLOW TABLE" performed?
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)?
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?
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?
Action Yes
Go to Step 2.
Go to Step 3.
Faulty shift solenoid valve,
its circuit or transmission
Go to Step 5.
No
Go to "AUTOMATIC
TRANSMISSION DIAG-
NOSTIC FLOW TABLE" in
this section.
Faulty ECT sensor, its cir-
cuit or engine cooling sys-
tem.
If OK, substitute a known-
good PCM and recheck.
"GRN" wire or "GRN/
RED" wire shorted to
power circuit.
If OK, go to Step 4.
Faulty O/D off switch or its
circuit.
If OK, substitute a known-
good PCM and recheck.