YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A/T) 7B1-33
O/D cut
switch
OFF ON
Voltage
Battery
voltage
0 V
DIAGNOSTIC FLOW 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.
D O/D cut switch: ON
D 4WD LOW switch: ON
D Cruise control module: O/D OFF command signal is output (if equipped).
D ECT: ECT < 30_C (86_F)
TROUBLESHOOTING
WARNING:
D When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and very careful during testing to avoid occurrence of an accident.
D Road test should be carried out with 2 person, a driver and tester, on a level road.
STEP ACTION YES NO
1 Was “AUTOMATIC TRANSMISSION
DIAGNOSTIC FLOW TABLE” performed?
Go to Step 2. Go to “AUTOMATIC
TRANSMISSION
DIAGNOSTIC FLOW
TABLE”.
2 ECT check:
(1)Warm up engine to normal operating
temperature.
(2)Check ECT using scan tool.
Is ECT more than 30_C (86_F)?
Go to Step 3. Faulty ECT sensor,
its circuit or engine
cooling system.
If OK, substitute a known-
good PCM and recheck.
3 Perform running test under the following
conditions and check voltage between
C51-1-2 (G16/J20 engines) or C51-1-6 (H25
engine) terminal of PCM coupler and ground,
C51-1-1 terminal of PCM coupler and ground.
D O/D cut switch OFF (“O/D OFF” lamp OFF).
D Normal mode in “D” range.
D Transfer “2H” position.
D Cruise control is not operated (if equipped).
D Drive vehicle with 4th gear condition
referring to “Gear shift diagram” in this
section.
Is each voltage about 0 V?
Faulty shift solenoid
valve, its circuit or
transmission.
“G” wire or “G/R” wire
shorted to power circuit.
If OK, go to Step 4.
4 O/D cut switch signal inspection:
(1)With ignition switch ON, check voltage
between E61-33 (G16/J20 engines) or
E61-14 (H25 engine) terminal of PCM
coupler and ground.
Is the result as specified?
Go to Step 5. Faulty O/D cut switch or
its circuit.
If OK, substitute a known-
good PCM and recheck.
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